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Revenue from Contracts with Customers - Additional Information (Details) - USD ($) $ in Thousands	Sep. 26, 2025	Mar. 28, 2025
Revenue from Contract with Customer [Abstract]
Trade accounts receivable, returns, credits issued, and price protection adjustments, current	$ 29,282	$ 33,855

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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

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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