v3.26.1
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. 27, 2026
Mar. 28, 2025
Mar. 29, 2024
Earnings Per Share [Abstract]      
Net (loss) attributable to Allegro MicroSystems, Inc. $ (14,897) $ (73,010) $ 152,697
Basic weighted average common shares (in shares) 185,035,670 187,707,391 192,573,169
Dilutive effect of common stock equivalents (in shares) 0 0 2,101,183
Diluted weighted average common shares (in shares) 185,035,670 187,707,391 194,674,352
Basic net (loss) income per common share attributable to Allegro MicroSystems, Inc. stockholders $ (0.08) $ (0.39) $ 0.79
Diluted net (loss) income per common share attributable to Allegro MicroSystems, Inc. stockholders $ (0.08) $ (0.39) $ 0.78