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Revenue from Contract with Customers - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 25, 2022	Mar. 26, 2021	Mar. 27, 2020
Revenue from Contract with Customer [Abstract]
Trade accounts receivable, returns, credits issued, and price protection adjustments, current	$ 14,924	$ 15,412
Trade accounts receivable, returns, credits issued, and price protection adjustments expense (credit)	$ (488)	$ (2,061)	$ 423

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- Definition

Accounts Receivable, Returns, Credits Issued, And Price Protection Adjustments, Current

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No definition available.

+ Details

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- Definition

Accounts Receivable, Returns, Credits Issued, And Price Protection Adjustments Expense (Income)

+ References

No definition available.

+ Details

Name:	algm_AccountsReceivableReturnsCreditsIssuedAndPriceProtectionAdjustmentsExpenseIncome
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