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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

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- 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

X

- 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