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Net Income (Loss) per Share - Schedule of Computation of Net (Loss) Income per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 26, 2025
Sep. 27, 2024
Sep. 26, 2025
Sep. 27, 2024
Earnings Per Share [Abstract]        
Net income (loss) attributable to Allegro MicroSystems, Inc. $ 6,519 $ (33,675) $ (6,708) $ (51,350)
Basic weighted average common shares (in shares) 185,074,119 189,182,850 184,830,588 191,324,281
Dilutive effect of common stock equivalents (in shares) 1,231,666 0 0 0
Diluted weighted average common shares (in shares) 186,305,785 189,182,850 184,830,588 191,324,281
Basic net income (loss) per common share attributable to Allegro MicroSystems, Inc. stockholders $ 0.04 $ (0.18) $ (0.04) $ (0.27)
Diluted net income (loss) per common share attributable to Allegro MicroSystems, Inc. stockholders $ 0.03 $ (0.18) $ (0.04) $ (0.27)