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Revenue from Contract with Customers - Additional Information (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Dec. 25, 2020 | Dec. 27, 2019 | Mar. 27, 2020
Revenue from Contract with Customer [Abstract] |  |  |
Trade accounts receivable, returns, credits issued, and price protection adjustments, current | $ 16,574 |  | $ 17,473
Trade accounts receivable, returns, credits issued, and price protection adjustments expense (credit) | $ 899 | $ 815 |

X
- Definition Accounts Receivable, Returns, Credits Issued, And Price Protection Adjustments, Current + References No definition available. + Details
Name: | algm_AccountsReceivableReturnsCreditsIssuedAndPriceProtectionAdjustmentsCurrent
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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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration