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Revenue from Contract with Customers - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 25, 2021	Jun. 26, 2020	Mar. 26, 2021
Revenue from Contract with Customer [Abstract]
Trade accounts receivable, returns, credits issued, and price protection adjustments, current	$ 13,799		$ 15,412
Trade accounts receivable, returns, credits issued, and price protection adjustments expense (credit)	$ (1,613)	$ 1,740

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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

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