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v3.25.3

Net Loss per Share - Additional Information (Details) - shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 26, 2025 | Sep. 27, 2024 | Sep. 26, 2025 | Sep. 27, 2024
Earnings Per Share [Abstract] |  |  |  |
Dilutive effect of common stock equivalents (in shares) | 1,231,666 | 0 | 0 | 0

X
- Definition Weighted Average Number Issuable Shares Outstanding Adjustment + References No definition available. + Details
Name: | algm_WeightedAverageNumberIssuableSharesOutstandingAdjustment
Namespace Prefix: | algm_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_EarningsPerShareAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration