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Revenue from Contract with Customers - Narrative (Detail) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Dec. 25, 2020 | Dec. 27, 2019 | Mar. 27, 2020 | Mar. 29, 2019
Returns and sales allowances | $ 16,574 |  | $ 17,473 | $ 17,608
Trade accounts receivable, returns, credits issued, and price protection adjustments expense (credit) | $ 899 | $ 815 |  |
Previously Reported |  |  |  |
Returns and sales allowances |  |  | $ 17,185 |

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- Definition Accounts Receivable Returns Credits Issued And Price Protection Adjustments Current + References No definition available. + Details
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Namespace Prefix: | algm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Accounts Receivable Returns Credits Issued and Price Protection Adjustments Expense Credit. + References No definition available. + Details
Name: | algm_AccountsReceivableReturnsCreditsIssuedAndPriceProtectionAdjustmentsExpenseCredit
Namespace Prefix: | algm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | srt_RestatementAxis=srt_ScenarioPreviouslyReportedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |