Revenue from Contracts with Customers - Additional Information (Details) - USD ($) $ in Thousands	Dec. 29, 2023	Mar. 31, 2023
Revenue from Contract with Customer [Abstract]
Trade accounts receivable, returns, credits issued, and price protection adjustments, current	$ 35,342	$ 30,571

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

No definition available.

Name:	algm_AccountsReceivableReturnsCreditsIssuedAndPriceProtectionAdjustmentsCurrent
Namespace Prefix:	algm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant