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Net (Loss) Income per Share - Schedule of Computation of Net (Loss) Income per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 28, 2025
Mar. 29, 2024
Mar. 31, 2023
Earnings Per Share [Abstract]      
Net (loss) income attributable to Allegro MicroSystems, Inc. $ (73,010) $ 152,697 $ 187,357
Basic weighted average common shares (in shares) 187,707,391 192,573,169 191,197,452
Dilutive effect of common stock equivalents (in shares) 0 2,101,183 2,490,650
Diluted weighted average common shares (in shares) 187,707,391 194,674,352 193,688,102
Basic net (loss) income per common share attributable to Allegro MicroSystems, Inc. stockholders $ (0.39) $ 0.79 $ 0.98
Diluted net (loss) income per common share attributable to Allegro MicroSystems, Inc. stockholders $ (0.39) $ 0.78 $ 0.97