75000 - Document - Cover Page
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75010 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS
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75020 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)
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75030 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
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75040 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
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75050 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY
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75060 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
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995455 - Disclosure - Nature of the Business and Basis of Presentation
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995465 - Disclosure - Summary of Significant Accounting Policies
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995475 - Disclosure - Revenue from Contracts with Customers
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995485 - Disclosure - Fair Value Measurements
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995495 - Disclosure - Trade Accounts Receivable, net
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995505 - Disclosure - Inventories
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995515 - Disclosure - Property, Plant and Equipment, net
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995525 - Disclosure - Goodwill and Intangible Assets
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995535 - Disclosure - Debt and Other Borrowings
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995545 - Disclosure - Commitments and Contingencies
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995555 - Disclosure - Net Income (Loss) per Share
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995565 - Disclosure - Common Stock and Stock-Based Compensation
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995575 - Disclosure - Income Taxes
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995585 - Disclosure - Restructuring
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995595 - Disclosure - Related Party Transactions
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995605 - Disclosure - Summary of Significant Accounting Policies (Policies)
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995615 - Disclosure - Revenue from Contracts with Customers (Tables)
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995625 - Disclosure - Fair Value Measurements (Tables)
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995635 - Disclosure - Trade Accounts Receivable, net (Tables)
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995645 - Disclosure - Inventories (Tables)
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995655 - Disclosure - Property, Plant and Equipment, net (Tables)
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995665 - Disclosure - Goodwill and Intangible Assets (Tables)
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995675 - Disclosure - Debt and Other Borrowings (Tables)
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995685 - Disclosure - Net Income (Loss) per Share (Tables)
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995695 - Disclosure - Common Stock and Stock-Based Compensation (Tables)
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995705 - Disclosure - Income Taxes (Tables)
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995715 - Disclosure - Summary of Significant Accounting Policies - Business Segment Information - Additional Information (Details)
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995725 - Disclosure - Summary of Significant Accounting Policies - Concentrations of Credit Risk - Additional Information (Details)
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995735 - Disclosure - Revenue from Contracts with Customers - Net Sales by Core End Market and Application (Details)
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995745 - Disclosure - Revenue from Contracts with Customers - Net Sales by Product (Details)
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995755 - Disclosure - Revenue from Contracts with Customers - Net Sales by Geography (Details)
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995765 - Disclosure - Revenue from Contracts with Customers - Additional Information (Details)
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995775 - Disclosure - Fair Value Measurements - Assets And Liabilities Measured At Fair Value (Details)
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995785 - Disclosure - Fair Value Measurements - Additional Information (Details)
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995795 - Disclosure - Trade Accounts Receivable, net - Summary of Trade Accounts Receivable (Details)
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995805 - Disclosure - Trade Accounts Receivable, net - Additional Information (Details)
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995815 - Disclosure - Inventories - Schedule of Inventories (Details)
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995825 - Disclosure - Inventories - Narrative (Details)
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995835 - Disclosure - Property, Plant and Equipment, net - Schedule of Property, Plant, and Equipment (Details)
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995845 - Disclosure - Property, Plant and Equipment, net - Narrative (Details)
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995855 - Disclosure - Goodwill and Intangible Assets - Summary of Changes in Carrying Amount of Goodwill (Details)
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995865 - Disclosure - Goodwill and Intangible Assets - Schedule of Intangible Assets, Net (Details)
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995875 - Disclosure - Goodwill and Intangible Assets - Narrative (Details)
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995885 - Disclosure - Debt and Other Borrowings - Schedule of Debt Obligations (Details)
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995895 - Disclosure - Debt and Other Borrowings - Schedule of Debt Obligations (Details) 2
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995905 - Disclosure - Debt and Other Borrowings - Additional Information (Details)
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995915 - Disclosure - Net Income (Loss) per Share - Schedule of Computation of Net (Loss) Income per Share (Details)
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995925 - Disclosure - Net Income (Loss) per Share - Schedule of Issuable Weighted Average Dilutive Share Information (Details)
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995935 - Disclosure - Common Stock and Stock-Based Compensation - Schedule of RSU and PSU (Details)
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995945 - Disclosure - Common Stock and Stock-Based Compensation - Narrative (Details)
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995955 - Disclosure - Common Stock and Stock-Based Compensation - Schedule of Pre-tax Stock-Based Compensation Expense (Details)
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995955 - Disclosure - Common Stock and Stock-Based Compensation - Schedule of Pre-tax Stock-Based Compensation Expense (Details) [Default]
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995965 - Disclosure - Income Taxes - Schedule of Income Tax Provision (benefit) (Details)
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995975 - Disclosure - Restructuring - Additional Information (Details)
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995985 - Disclosure - Related Party Transactions - Additional Information (Details)
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Line of Credit Facility [Line Items]
Line of Credit Facility [Line Items]
Schedule of Related Party Transactions, by Related Party [Table]
Related Party Transaction [Table]
Gross Profit
Gross profit
Restructuring and Related Activities Disclosure [Text Block]
Restructuring
Preferred stock, shares issued (in shares)
Preferred Stock, Shares Issued
Debt and Other Borrowings
Debt Disclosure [Text Block]
Interest Expense, Total
Interest expense
Interest Expense, Operating and Nonoperating
Stock-based compensation expense not yet recorded
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total
Outstanding balance
Long-Term Line of Credit
Long-Term Line of Credit, Total
Dividends, Cash
Dividends, Cash, Total
Dividends to non-controlling interest
Basis spread on variable rate
Debt Instrument, Basis Spread on Variable Rate
Commitments and Contingencies
Commitments and contingencies (Note 10)
Diluted weighted average common shares (in shares)
Diluted (in shares)
Weighted Average Number of Shares Outstanding, Diluted
Accounts receivable - other
Other Receivables, Net, Current
Other Receivables, Net, Current, Total
2023 Term Loan Refinancing
Two Thousand and Twenty Three Term Loan Refinancing [Member]
Two Thousand and Twenty Three Term Loan Refinancing
Minimum
Minimum [Member]
Letter of Credit
Letter of Credit [Member]
Preferred stock, beginning balance (in shares)
Preferred stock, ending balance (in shares)
Preferred Stock, Shares Outstanding
Preferred stock, shares outstanding (in shares)
Schedule of Weighted Average Number of Shares [Table Text Block]
Schedule of Issuable Weighted Average Share Information
Fair Value, Recurring
Fair Value, Recurring [Member]
Common stock, shares issued (in shares)
Common Stock, Shares, Issued
Income tax provision (benefit)
Income tax provision (benefit)
Income Tax Expense (Benefit)
Income Tax Expense (Benefit), Total
Foreign currency translation
Goodwill, Foreign Currency Translation, Gain (Loss)
Discharge Of outstanding balances
Extinguishment of Debt, Amount
Trade Accounts Receivable, net
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
Related Party Transaction [Line Items]
Related Party Transaction [Line Items]
Restricted stock units
Restricted Stock Units (RSUs) [Member]
Restricted Stock Units (RSUs)
Increase in net income per share
Increase in Net Income Per Share
Increase in net income per share
Finite-Lived Intangible Assets, Major Class Name [Domain]
Intangible Asset, Finite-Lived, Class [Domain]
Maximum borrowing capacity
Line of Credit Facility, Maximum Borrowing Capacity
Subsequent Event Type [Domain]
Work in process
Inventory, Work in Process, Net of Reserves
Cost of goods sold
Cost of Product and Service Sold
Cost of Goods and Services Sold, Total
Two Thousand Twenty Five Refinancing and Repricing of Refinanced Two Thousand Twenty Three Term Loan Facility [Member]
Two thousand twenty five refinancing and repricing of refinanced two thousand twenty three term loan facility.
2025 Refinancing and Repricing of Refinanced 2023 Term Loan Facility
Two Thousand And Twenty Three Term Loan Refinancing and Repricing Facility [Member]
Two Thousand And Twenty Three Term Loan Refinancing and Repricing Facility [Member]
2023 Term Loan Refinancing and Repricing Facility
Property, Plant and Equipment, net
Property, Plant, and Equipment [Text Block]
Asset, Held-for-Sale, Not Part of Disposal Group
Asset, Held-for-Sale, Not Part of Disposal Group, Total
Value of assets
Restricted cash
Restricted Cash, Current
Decrease in interim income tax benefit
Decrease in Income Tax Benefit
Decrease in income tax benefit.
Erin Hagen.
Erin Hagen [Member]
Related Party Transaction, Sublease Agreement Payment
Related Party Transaction, Sublease Agreement Payment
Sublease agreement, payment
Effect of exchange rate changes on cash and cash equivalents and restricted cash
Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation
Issued (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Issued in Period
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Issued in Period
Cost of goods sold to related party
Costs and Expenses, Related Party
Decrease in income tax expense.
Decrease In Income Tax Expense
Decrease in interim income tax expense
Income Statement [Abstract]
Debt Instrument, Covenant, Leverage Ratio, Maximum
Debt Instrument, Covenant, Leverage Ratio, Maximum
Leverage ratio
Forfeited (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period
Non-Related Party Revenue
Non-Related Party Revenue
Non-Related Party Revenue [Member]
Related Party [Domain]
Related and Nonrelated Parties [Domain]
Schedule of Finite-Lived Intangible Assets [Table]
Intangible Asset, Finite-Lived [Table]
Basic (in dollars per share)
Earnings Per Share, Basic
Earnings Per Share, Basic, Total
Basic net income (loss) per common share attributable to Allegro MicroSystems, Inc. stockholders
Document Period End Date
Document Period End Date
Purchases of property, plant and equipment
Payments to Acquire Property, Plant, and Equipment
Payments to Acquire Property, Plant, and Equipment, Total
Debt Instrument [Line Items]
Common stock, shares authorized (in shares)
Common Stock, Shares Authorized
Statement of Stockholders' Equity [Abstract]
Debt Securities [Member]
Debt Securities
Prepaid expenses and other current assets
Prepaid Expense and Other Assets, Current
Income (Loss) from Equity Method Investments
Loss in earnings of equity investment
Schedule of Nonvested Performance-Based Units Activity [Table Text Block]
Summary of Performance Stock Units Activity
Increase in goodwill
Goodwill, Period Increase (Decrease)
Goodwill, Period Increase (Decrease), Total
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value
Fair value vested
Investments [Domain]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]
Disaggregation of Revenue [Table]
Disaggregation of Revenue [Table]
Assets
Total assets
Title of 12(b) Security
Title of 12(b) Security
Inclusion percentage of target goals
Share-Based Compensation Arrangement By Share-Based Payment Award, Inclusion Percentage Of Target Goals
Share-Based Compensation Arrangement By Share-Based Payment Award, Inclusion Percentage Of Target Goals
Greater China
CHINA
Goodwill, Total
Goodwill
Beginning balance
Ending balance
Goodwill
Preferred Stock, Value, Issued
Preferred stock, $0.01 par value; 20,000,000 shares authorized, no shares issued or outstanding
Related Party Transaction [Axis]
Related Party Transaction [Axis]
Beginning balance (in shares)
Ending balance (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number
Reclassification, Comparability Adjustment [Policy Text Block]
Reclassifications
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
Schedule of Pre-tax Stock-Based Compensation Expense
Sanken
Sanken [Member]
Sanken Electric Co., Ltd.
Customer Concentration Risk
Customer Concentration Risk [Member]
Effective tax rate
Effective Income Tax Rate Reconciliation, Percent
Effective Income Tax Rate Reconciliation, Percent, Total
Variable Rate [Axis]
Variable Rate [Axis]
Cash and Cash Equivalents [Domain]
Cash and Cash Equivalents [Domain]
Customer relationships
Customer Relationships [Member]
Net Sales by Core End Market and Application
Disaggregation of Revenue [Table Text Block]
Equity attributable to Allegro MicroSystems, Inc.
Equity, Attributable to Parent
Equity, Attributable to Parent, Beginning Balance
Equity, Attributable to Parent, Ending Balance
Other assets
Other Assets, Noncurrent
Income Taxes
Income Tax Disclosure [Text Block]
Fair Value, by Balance Sheet Grouping [Table Text Block]
Fair Value, by Balance Sheet Grouping
Earnings Per Share [Text Block]
Net Income (Loss) per Share
Fair value of debt
Long-Term Debt, Fair Value
Largest Distributor
Largest Distributor [Member]
Largest Distributor
Revenue Benchmark
Revenue Benchmark [Member]
Weighted-Average Grant Date Fair Value
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Equity [Member]
Allegro Microsystems, Inc.
Allegro Microsystems, Inc. [Member]
Allegro Microsystems, Inc.
Office equipment
Office Equipment [Member]
Outstanding balance
Total loans outstanding
Total loans outstanding
Credit Facility [Axis]
Credit Facility [Axis]
Long-Lived Asset, Impaired, to be Disposed of Other than by Sale, Amount
Total unadjusted carrying value of assets not meeting held for sale criteria
Provision for expected credit losses
Accounts Receivable, Credit Loss Expense (Reversal)
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Shares Cancelled In Period
Share based compensation arrangement by share based payment award equity instruments other than options shares cancelled in period.
Cancelled
Revolving Credit Facility
Senior Secured Revolving Credit Facility
Revolving Credit Facility [Member]
Geographical [Domain]
Geographical [Domain]
Statistical Measurement [Axis]
Statistical Measurement [Axis]
Money Market Funds [Member]
Money Market Fund Deposits
Entity Interactive Data Current
Entity Interactive Data Current
Balance at the end of the period
Returns and sales allowances
Balance at the beginning of the period
Accounts Receivable, Allowance For Returns And Sales, Current
Accounts Receivable, Allowance For Returns And Sales, Current
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Common stock, $0.01 par value; 1,000,000,000 shares authorized, 186,483,352 share issued and outstanding at September 25, 2026; 1,000,000,000 shares authorized, 185,357,343 shares issued and outstanding at March 27, 2026
Common Stock, Value, Issued
Schedule of Computation of Net (Loss) Income per Share and Unaudited Pro Forma Net Income per Share
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Total liabilities
Liabilities
Ownership [Domain]
Ownership [Domain]
Related Party Transaction, Distribution Agreement Terms
Related Party Transaction, Distribution Agreement Terms
Distribution agreement period
Product and Service [Axis]
Product and Service [Axis]
Retained Earnings (Accumulated Deficit)
Retained Earnings (Accumulated Deficit), Total
Accumulated deficit
Level 3
Fair Value, Inputs, Level 3 [Member]
Refinancing and Repricing Facility [Member]
Refinancing and Repricing Facility [Member]
Refinancing and Repricing Facility
Cash equivalents, money market fund deposits
Cash and Cash Equivalents, Fair Value Disclosure
Money market fund deposits and time deposits
Total operating expenses
Operating Expenses
Michael Doogue [Member]
Michael Doogue.
Fair Value, by Balance Sheet Grouping [Table]
Fair Value, by Balance Sheet Grouping [Table]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue [Line Items]
Nature of the Business and Basis of Presentation
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]
Changes in operating assets and liabilities:
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract]
Term Loan Facility
Term loan facility.
2020 Term Loan Facility
Term Loan Facility [Member]
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest
Other comprehensive gain (loss) attributable to non-controlling interests
Variable Rate [Domain]
Variable Rate [Domain]
Intangible Asset, Finite-Lived, Accumulated Amortization
Accumulated Amortization
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less accumulated depreciation
Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance
Related Party Transactions [Abstract]
Long-Lived Tangible Asset [Axis]
Long-Lived Asset, Class [Axis]
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Axis]
Assets:
Assets, Fair Value Disclosure [Abstract]
Dilutive effect of common stock equivalents (in shares)
Weighted Average Number of Shares Outstanding, Diluted, Adjustment
Weighted Average Number of Shares Outstanding, Diluted, Adjustment, Total
Property, Plant and Equipment [Line Items]
Property, Plant, and Equipment [Line Items]
Long-term debt including finance lease liabilities.
Long-Term Debt Including Finance Lease Liabilities
Total debt
Long Term Debt and Finance Lease Liability Current
Long term debt and finance lease liability current.
Current portion of long-term debt and finance lease liabilities
Base Rate [Member]
Base Rate
Current portion of operating lease liabilities
Operating Lease, Liability, Current
Concentration Risk Type [Domain]
Incurred fees amount
Debt Instrument, Fee Amount
Repayments of Long-Term Lines of Credit
Repayment of term loan
Beginning balance (in dollars per share)
Ending balance (in dollars per share)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value
Customer [Domain]
Customer [Domain]
Liabilities and Equity
Total liabilities, non-controlling interest and stockholders' equity
Indefinite-lived process technology and trademarks
Indefinite-Lived Technology-Based Intangible Assets And Legacy Trademarks [Member]
Indefinite-Lived Technology-Based Intangible Assets And Legacy Trademarks
Research and development
Research and Development Expense
Research and Development Expense, Total
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Table Text Block]
Revenue from External Customers by Products and Services
Measurement period adjustments
Goodwill, Measurement Period Adjustment
Finite-Lived Intangible Assets by Major Class [Axis]
Intangible Asset, Finite-Lived, Class [Axis]
Document Fiscal Period Focus
Document Fiscal Period Focus
Schedule of Inventories
Schedule of Inventory, Current [Table Text Block]
Property, Plant and Equipment [Table]
Property, Plant, and Equipment [Table]
Restricted cash, money market fund deposits
Restricted Cash and Cash Equivalents, Fair Value Disclosure
Restricted Cash and Cash Equivalents, Fair Value Disclosure
Money market fund deposits
Performance stock units
Performance Shares [Member]
Performance Stock Units (PSUs)
Jennie Raubacher [Member]
Jennie Raubacher.
Schedule Of Anti Dilutive Securities Excluded [Table Text Block]
Schedule Of Anti Dilutive Securities Excluded
Schedule of Anti Dilutive Securities Excluded
Net increase (decrease) in cash and cash equivalents and restricted cash
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation
Entity Current Reporting Status
Entity Current Reporting Status
Related party transaction distribution agreement terminate date.
Distribution agreement terminate date
Use of Estimates
Use of Estimates, Policy [Policy Text Block]
Level 1
Fair Value, Inputs, Level 1 [Member]
Accounts Payable, Current
Accounts Payable, Current, Total
Accounts payable
Amounts due to related party
Investment Type [Axis]
Total assets
Assets, Fair Value Disclosure
Credit Suisse AG, Cayman Islands Branch
Credit Suisse AG, Cayman Islands Branch [Member]
Credit Suisse AG, Cayman Islands Branch
Document Transition Report
Document Transition Report
Concentration Risk [Line Items]
Commitments and Contingencies Disclosure [Abstract]
Inventories
Increase (Decrease) in Inventories
Increase (Decrease) in Inventories, Total
Other Americas
Other Americas [Member]
Other Americas
Current liabilities:
Liabilities, Current [Abstract]
Restructuring Plan [Domain]
Share-Based Payment Arrangement [Abstract]
Stockholders' Equity:
Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Industrial and other end market.
Industrial And Other End Market [Member]
Industrial and Other
Common Stock
Common Stock [Member]
Finished goods
Inventory, Finished Goods, Net of Reserves
Credit Facility [Domain]
Credit Facility [Domain]
Statistical Measurement [Domain]
Statistical Measurement [Domain]
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Shares Cancelled In Period Weighted Average Grant Date Fair Value
Share based compensation arrangement by share based payment award equity instruments other than options shares cancelled in period weighted average grant date fair value.
Cancelled (in dollars per share)
Other (expense) income:
Nonoperating Income (Expense) [Abstract]
Gross
Intangible Asset, Finite-Lived, before Accumulated Amortization
Finite-Lived Intangible Assets, Gross, Total
Basic (in shares)
Weighted Average Number of Shares Outstanding, Basic
Weighted Average Number of Shares Outstanding, Basic, Total
Basic weighted average common shares (in shares)
Property, Plant, and Equipment [Abstract]
Assets
Assets [Abstract]
Entity Central Index Key
Entity Central Index Key
Weighted Average Number of Shares Outstanding, Basic [Abstract]
Weighted average shares outstanding:
Trade accounts receivable, returns, credits issued, and price protection adjustments, current
Accounts Receivable, Returns, Credits Issued, And Price Protection Adjustments, Current
Accounts Receivable, Returns, Credits Issued, And Price Protection Adjustments, Current
Line of Credit Facility [Table]
Line of Credit Facility [Table]
Increase (decrease) in net income (loss)
Increase (Decrease) in Net Income (Loss)
Increase (decrease) in net income (loss).
Current Fiscal Year End Date
Current Fiscal Year End Date
Shares
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Document Quarterly Report
Document Quarterly Report
Morgan Stanley Senior Funding, Inc
Morgan Stanley Senior Funding, Inc [Member]
Morgan Stanley Senior Funding, Inc
Debt Instrument, Maturity Date
Maturity date
Payments for taxes related to repurchase of common stock
Payments For Taxes Related To Repurchase Of Common Stock
Payments for taxes related to repurchase of common stock.
Cash and Cash Equivalents [Axis]
Cash and Cash Equivalents [Axis]
Level 2
Fair Value, Inputs, Level 2 [Member]
Net cash provided by operating activities
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation
Entity Incorporation, State or Country Code
Entity Incorporation, State or Country Code
Diluted (in dollars per share)
Earnings Per Share, Diluted
Earnings Per Share, Diluted, Total
Diluted net income (loss) per common share attributable to Allegro MicroSystems, Inc. stockholders
Preferred stock, par value (in dollars per share)
Preferred Stock, Par or Stated Value Per Share
Net income (loss) attributable to Allegro MicroSystems, Inc.
Net income (loss) attributable to Allegro MicroSystems, Inc.
Long-term debt, and finance lease liabilities excluding current maturities.
Long-term Debt, And Finance Lease Liabilities Excluding Current Maturities
Total long-term debt and finance lease liabilities, less current portion
Ownership [Axis]
Ownership [Axis]
Commitments and Contingencies
Commitments and Contingencies Disclosure [Text Block]
Long-Lived Tangible Asset [Domain]
Long-Lived Asset, Class [Domain]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Comprehensive income (loss) attributable to Allegro MicroSystems, Inc.
Technology-Based Intangible Assets [Member]
Completed technologies
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue [Table Text Block]
Revenue from External Customers by Geographic Areas
Stock Issued During Period Value Share Based Compensation And Restricted Stock Vested
Stock-based compensation, net of forfeitures and restricted stock vested
Stock issued during period value share based compensation and restricted stock vested.
Measurement Frequency [Domain]
Measurement Frequency [Domain]
Foreign currency translation adjustment, net of tax
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax
Foreign currency translation adjustment
Equity Components [Axis]
Equity Components [Axis]
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract]
Cash flows from investing activities:
Statement of Cash Flows [Abstract]
Fair Value Hierarchy and NAV [Domain]
Fair Value Hierarchy and NAV [Domain]
Income Tax Disclosure [Abstract]
Increase in net income
Increase in Net Income
Increase in net income
Commitment fee percentage
Line of Credit Facility, Commitment Fee Percentage
Increase (Decrease) in Prepaid Expense and Other Assets
Prepaid expenses and other assets
Terminate percentage
Debt Instrument Loans and Commitments Terminate Percentage
Debt Instrument Loans and Commitments Terminate Percentage
Net Carrying Amount
Intangible assets, net
Intangible Asset, Excluding Goodwill, after Accumulated Amortization
Fair Value Measurements
Fair Value Disclosures [Text Block]
Depreciation, Depletion and Amortization
Depreciation and amortization
Depreciation, Depletion and Amortization, Total
Payments of Ordinary Dividends, Noncontrolling Interest
Dividends paid to non-controlling interest
Machinery and equipment
Machinery and Equipment [Member]
Preferred stock, shares authorized (in shares)
Preferred Stock, Shares Authorized
Antidilutive securities excluded from computation of net income per share (in shares)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Number of Operating Segments
Number of operating segments
Buildings, building improvements and leasehold improvements
Buildings, Building Improvements And Leasehold Improvements [Member]
Buildings, Building Improvements And Leasehold Improvements
June 2025 Restructuring
June 2025 Restructuring [Member]
June 2025 Restructuring.
Refinanced and Repricing Two Thousand Twenty Five Term Loan Facility [Member]
Refinanced and repricing two thousand twenty five term loan facility.
Refinancing and Repricing 2025 Term Loan Facility
2025 Refinanced Loans
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent [Member]
Related Party Revenue
Related Party Revenue [Member]
Related Party Revenue
Deferred income tax assets
Deferred Income Tax Assets, Net
Refinanced 2023 Term Loan Facility
Refinanced Two Thousand And Twenty Three Term Loan Facility [Member]
Refinanced two thousand and twenty three term loan facility.
Trade accounts payable
Increase (Decrease) in Accounts Payable, Trade
Total
Inventories
Inventory, Net
Segment Reporting, Policy [Policy Text Block]
Segment Information
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive income (loss):
Concentration Risk Benchmark [Domain]
TAIWAN
Taiwan
Restructuring costs
Restructuring Costs
Restructuring Costs, Total
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Current portion of long-term debt
Long-Term Debt, Current Maturities
Long-Term Debt, Current Maturities, Total
Customer [Axis]
Customer [Axis]
Short-Term Debt [Table]
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Asset, Goodwill and Other [Abstract]
Document Type
Document Type
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract]
Cash flows from operating activities:
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]
Liabilities and Equity [Abstract]
Liabilities, Non-Controlling Interest and Stockholders' Equity
Trade accounts receivable
Accounts Receivable, before Allowance for Credit Loss, And Due From Related Parties, Current
Accounts Receivable, before Allowance for Credit Loss, And Due From Related Parties, Current
Subsequent Event
Subsequent Event [Member]
Operating income
Operating Income (Loss)
Increase decrease in due to from related party.
Increase Decrease In Due To From Related Party
Due to and from related parties
Increase (Decrease) in Other Operating Assets and Liabilities, Net
Increase (Decrease) in Other Operating Assets and Liabilities, Net, Total
Other changes in operating assets and liabilities, net
Lender Name [Axis]
Lender Name [Axis]
Asset Intended to be Sold
Asset intended to be sold.
Asset intended to be sold
Entity File Number
Entity File Number
Income tax benefit included in increased net income.
Income Tax Benefit Included In Increased Net Income
Income tax benefit included in increased net income
Revenue from Contracts with Customers
Revenue from Contract with Customer [Text Block]
Location, Statement of Income, Balance [Axis]
Retained Earnings [Member]
Accumulated Deficit
Entity Registrant Name
Entity Registrant Name
Restructuring reserve
Restructuring Reserve
Restructuring Reserve, Ending Balance
Restructuring Reserve, Beginning Balance
Restructuring Reserve, Total
Accounting Policies [Abstract]
Depreciation expense
Depreciation
Depreciation, Total
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
Net income (loss)
Net income (loss)
Net (loss) income
Selling, general and administrative
Selling, General and Administrative Expense
Selling, General and Administrative Expense, Total
Selling general and administrative expenses
Land
Land [Member]
Entity Address, Address Line One
Entity Address, Address Line One
Net income attributable to non-controlling interests
Net Income (Loss) Attributable to Noncontrolling Interest
Net Income (Loss) Attributable to Noncontrolling Interest, Total
United States
UNITED STATES
Restructuring Cost [Table]
Total current assets
Assets, Current
Recognized loss of fair value forward repurchase contract
Loss on change in fair value of forward repurchase contract
Gain (Loss) on Sale of Derivatives
Loss on change in fair value of forward repurchase contract
Related Party Transactions
Related Party Transactions Disclosure [Text Block]
Schedule of Trade Accounts Receivable, Net
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Deferred Income Tax Expense (Benefit), Total
Deferred income taxes
Deferred Income Tax Expense (Benefit)
Entity Small Business
Entity Small Business
Long-term debt
Long-Term Debt, Excluding Current Maturities
Long-Term Debt, Excluding Current Maturities, Total
Issued (in dollars per share)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Issued in Period, Weighted Average Grant Date Fair Value
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Issued in Period, Weighted Average Grant Date Fair Value
Frofieted (in dollars per share)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value
Long-term Debt, Type [Axis]
Long-Term Debt, Type [Axis]
Summary of Significant Accounting Policies
Significant Accounting Policies [Text Block]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Trade accounts receivable, net
Trade accounts receivable, net
Trade accounts receivable, net
Accounts Receivable, after Allowance for Credit Loss, Current
Other Assets
Other Assets, Total
Related party - other assets
Advanced Payments Other Assets
Revision of Prior Period, Adjustment
Revision of Prior Period, Adjustment [Member]
Schedule of Long-Term Debt Instruments [Table Text Block]
Schedule of Debt Obligations
Other Asia
Other Asia [Member]
Other Asia
Restructuring and Related Activities [Abstract]
Equity Method Investee [Member]
PSL
Earnings Per Share [Abstract]
Net Income (loss) per common share attributable to Allegro MicroSystems, Inc.:
Inventory Write-Down And Accounts Receivable, Credit Loss Expense (Reversal)
Provisions for inventory and expected credit losses
Inventory Write-Down And Accounts Receivable, Credit Loss Expense (Reversal)
Restructuring Plan [Axis]
Subsequent Event Type [Axis]
Product and Service [Domain]
Product and Service [Domain]
Provision for expected credit losses
Balance at the beginning of the period
Balance at the end of the period
Accounts Receivable, Allowance for Credit Loss, Current
Measurement Frequency [Axis]
Measurement Frequency [Axis]
Amortization rate per quarter
Debt instrument amortization rate.
Debt Instrument Amortization Rate
Cash flows from financing activities:
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract]
Debt discount to be amortized to interest expense
Amortization of Debt Discount (Premium)
Less:
Less [Abstract]
Less
Polar Semiconductor, LLC
Polar Semiconductor, LLC [Member]
Polar Semiconductor, LLC
Line of Credit Facility, Lender [Domain]
Line of Credit Facility, Lender [Domain]
Entity Tax Identification Number
Entity Tax Identification Number
Equity Component [Domain]
Equity Component [Domain]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest
Comprehensive income (loss)
Entity Address, City or Town
Entity Address, City or Town
January 2025 Restructuring [Member]
January 2025 Restructuring.
January 2025 Restructuring
Finite-Lived Intangible Assets [Line Items]
Intangible Asset, Finite-Lived [Line Items]
Trademarks And Other [Member]
Trademarks And Other
Trademarks and other
Investment
Investments, Fair Value Disclosure, Total
Investments, Fair Value Disclosure
Exchange for equity interests amounts of transaction.
Exchange for Equity Interests Amounts of Transaction
Exchange for equity interests amounts of transaction
Entity Common Stock, Shares Outstanding (in shares)
Entity Common Stock, Shares Outstanding
Equity investment in related party
Equity Method Investments
Concentration Risk Type [Axis]
Recorded inventory provisions
Inventory Write-down
Entity [Domain]
Entity [Domain]
Goodwill and Intangible Assets
Intangible Asset and Goodwill [Text Block]
Decrease in depreciation expenses
Decrease in Depreciation Expenses
Decrease in depreciation expense
Statement [Table]
Statement [Table]
Stock-based compensation
Share-Based Payment Arrangement, Expense
Total pre-tax stock-based compensation expense
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest
Income (loss) before income taxes
Raw materials and supplies
Inventory, Raw Materials and Supplies, Net of Reserves
Inventory, Raw Materials and Supplies, Net of Reserves, Total
Entity Shell Company
Entity Shell Company
Accrued expenses and other current liabilities
Accounts Payable and Other Accrued Liabilities, Current
Net cash used in investing activities
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation
Statement [Line Items]
Statement [Line Items]
2023 Term Loans
Two thousand twenty three term loan facility.
Two Thousand Twenty Three Term Loan Facility [Member]
2023 Term Loan Facility
Maximum
Maximum [Member]
Japan
JAPAN
Debt Disclosure [Abstract]
Interest income
Investment Income, Interest
Construction in progress
Construction in Progress [Member]
Stock-based compensation, net of forfeitures and restricted stock vested (in shares)
Stock Issued During Period Shares Share Based Compensation And Restricted Stock Vested
Stock issued during period shares share based compensation and restricted stock vested.
Debt issuance costs recognized
Issuance costs incurred to the lenders
Debt Issuance Costs, Gross
Concentration Risk Benchmark [Axis]
Schedule of Restricted Stock Units Activity
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Payments of taxes withheld on net settlement of equity awards
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation
One- Month SOFR
One- Month Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
One- Month Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Purchases from related party
Related Party Transaction, Purchases from Related Party
Risks and Uncertainties [Abstract]
Payments for taxes related to net share settlement of equity awards
Payment, Tax Withholding, Share-Based Payment Arrangement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Granted (in dollars per share)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value
Amortization of deferred financing costs
Amortization of Debt Issuance Costs
Concentration Risk [Table]
Goodwill [Roll Forward]
Goodwill [Roll Forward]
Restructuring Cost and Reserve [Line Items]
Payments to Acquire Equity Securities, FV-NI
Investment in equity security
Current assets:
Assets, Current [Abstract]
Debt Issuance Costs, Net, Total
Debt Issuance Costs, Net
Unamortized debt issuance costs
Related Party Transaction [Domain]
Related Party Transaction [Domain]
Document Fiscal Year Focus
Document Fiscal Year Focus
Increase (Decrease) in Due to Related Parties
Increase (Decrease) in Due to Related Parties, Total
Payments to related party
Common stock, shares outstanding (in shares)
Beginning balance (in shares)
Ending balance (in shares)
Common Stock, Shares, Outstanding
Total stockholders’ equity
Beginning balance
Ending balance
Equity, Including Portion Attributable to Noncontrolling Interest
Two Thousand Twenty Four Term Loan Facility [Member]
Two thousand twenty four term loan facility.
2024 Term Loans
Statement of Comprehensive Income [Abstract]
Trade accounts payable
Accounts Payable, Trade, Current
Majority Shareholder [Member]
Sanken
Preliminary purchase price
Business Combination, Consideration Transferred
Business Combination, Consideration Transferred, Total
Related Party
Related Party [Member]
Operating lease liabilities, less current portion
Operating Lease, Liability, Noncurrent
Revision of Prior Period [Domain]
Schedule of Intangible Assets, Net
Intangible Asset, Finite-Lived [Table Text Block]
Ownership percentage by majority shareholder
Subsidiary, Ownership Percentage, Parent
Security Exchange Name
Security Exchange Name
Related Party [Axis]
Related and Nonrelated Parties [Axis]
Recent Accounting Pronouncements
New Accounting Pronouncements, Policy [Policy Text Block]
Disposal Group, Including Discontinued Operation, Assets, Current
Disposal Group, Including Discontinued Operation, Assets, Current, Total
Assets held for sale
Entity Address, State or Province
Entity Address, State or Province
Weighted average useful life
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition
Related Party Transaction, Amounts of Transaction
Related party transaction amounts
Operating Lease, Right-of-Use Asset
Operating lease right-of-use assets, net
Amendment Flag
Amendment Flag
Goodwill [Table Text Block]
Summary of Changes in Carrying Amount of Goodwill
Common Stock and Stock-Based Compensation
Share-Based Payment Arrangement [Text Block]
Payment for intangible assets
Payments for Intangible Assets
Payments for intangible assets
One Distributor Customer [Member]
One distributor customer.
One Distributor Customer
Concentration Risk, Percentage
Concentration risk, percentage
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table]
Debt Instrument [Axis]
Debt Instrument [Axis]
Other Nonoperating Income (Expense)
Other Nonoperating Income (Expense), Total
Other expense, net
SOFR
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Cash and cash equivalents and restricted cash at beginning of period
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Total
Cash and cash equivalents and restricted cash at end of period
City Area Code
City Area Code
Employee stock purchase plan issuances
Stock Issued During Period, Value, Employee Stock Purchase Plan
Preferred Stock
Preferred Stock [Member]
Other non-cash reconciling items
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Other Item
Assets Reclassified To Held And Used
Assets reclassified to held and used.
Assets reclassified to held and used
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Sharon Briansky Member
Sharon briansky.
Sharon Briansky [Member]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table]
Accounts and Financing Receivables [Table]
Operating expenses:
Operating Expenses [Abstract]
Inventories
Inventory Disclosure [Text Block]
Two thousand twenty term loan facility.
Two Thousand Twenty Term Loan Facility [Member]
2020 Term Loan Facility
Common stock, par value (in dollars per share)
Common Stock, Par or Stated Value Per Share
Legal Entity [Axis]
Legal Entity [Axis]
Fed Fund Rate
Fed Funds Effective Rate Overnight Index Swap Rate [Member]
Cumulative costs
Restructuring Cumulative Costs
Restructuring cumulative costs.
Total current liabilities
Liabilities, Current
Increase (decrease) in net income (loss) per share
Increase (Decrease) in Net Income (Loss) Per Share
Increase (decrease) in net income (loss) per share.
Property, Plant and Equipment, Gross, Total
Property, Plant and Equipment, Gross, Beginning Balance
Property, Plant and Equipment, Gross, Ending Balance
Total
Property, Plant, and Equipment, before Accumulated Depreciation, Depletion, and Amortization
Power integrated circuits
Power Integrated Circuits [Member]
Power Integrated Circuits
Trading Symbol
Trading Symbol
Finance Lease, Right-of-Use Asset, Amortization
Amortization of right-of-use assets
Geographical [Axis]
Geographical [Axis]
Schedule of Property, Plant, and Equipment
Property, Plant, and Equipment [Table Text Block]
Payment applied to the term loan balance
Payments to term loan.
Payments to Term Loan
Granted (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period
Entity Emerging Growth Company
Entity Emerging Growth Company
Additional Paid-In Capital
Additional Paid-in Capital [Member]
Receivables [Abstract]
Long-Term Debt, Gross
Total loans outstanding
Other long-term liabilities
Other Liabilities, Noncurrent
Europe
Europe [Member]
Finance Lease, Liability, Total
Finance Lease, Liability
Finance lease liabilities
Stock Issued During Period, Shares, Employee Stock Purchase Plans
Employee stock purchase plan issuances (shares)
Revision of Prior Period [Axis]
Cover [Abstract]
Time Deposit [Member]
Time deposit.
Time Deposits
Equity, Attributable to Noncontrolling Interest
Equity, Attributable to Noncontrolling Interest, Total
Equity, Attributable to Noncontrolling Interest, Beginning Balance
Equity, Attributable to Noncontrolling Interest, Ending Balance
Non-controlling interest
Magnetic Sensors
Magnetic Sensors [Member]
Magnetic sensors (“MS”)
Magnetic sensors
Revenue from Contract with Customer [Abstract]
Dilutive effect of common stock equivalents (in shares)
Weighted Average Number Issuable Shares Outstanding Adjustment
Weighted Average Number Issuable Shares Outstanding Adjustment
Long-term Debt, Type [Domain]
Long-Term Debt, Type [Domain]
South Korea
KOREA, REPUBLIC OF
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss), Net of Tax
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total
Concentrations of Credit Risk
Concentration Risk, Credit Risk, Policy [Policy Text Block]
Property, Plant, and Equipment, Useful Life
Average useful life of machinery and equipment
Intangible assets amortization expense
Intangible Asset, Finite-Lived, Amortization Expense
Stock-based compensation
Share-Based Payment Arrangement, Noncash Expense
Share-Based Payment Arrangement, Noncash Expense, Total
Additional paid-in capital
Additional Paid in Capital
Additional Paid in Capital, Total
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract]
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Fair Value Disclosures [Abstract]
Cash and cash equivalents
Cash and Cash Equivalent
Cash and Cash Equivalents, at Carrying Value, Total
Equity Securities [Member]
Equity Securities
Non-Controlling Interests
Noncontrolling Interest [Member]
Employee Stock [Member]
Employee Stock Purchase Plan (ESPP)
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation
Net cash used in financing activities
Proceeds from Stock Plans
Proceeds from issuance of common stock under employee stock purchase plan
Proceeds from Stock Plans, Total
Trade Accounts Receivable [Member]
Trade Accounts Receivable
Entity Filer Category
Entity Filer Category
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
Automotive
Automotive End Market [Member]
Automotive End Market
Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description
Trade accounts receivable
Increase (Decrease) in Accounts Receivable
Total
Property, plant and equipment, net
Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization
Sanken Distribution Agreement, One-Time Sales Return
Sanken Distribution Agreement, One-Time Sales Return [Member]
Sanken Distribution Agreement, One-Time Sales Return
Patents
Patents [Member]
Total net sales
Net sales
Revenue from Contract with Customer, Excluding Assessed Tax
Inventory Disclosure [Abstract]
Effect on Future Cash Flows, Amount
Estimates future charges
Schedule of Income Tax Provision (benefit)
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Other Assets, Current
Related party - other current assets
Right-of-use asset
Right Of Use Asset [Member]
Right Of Use Asset.
Entity Address, Postal Zip Code
Entity Address, Postal Zip Code
Statement of Financial Position [Abstract]
Finance Lease, Principal Payments
Finance lease payments
Local Phone Number
Local Phone Number