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Net Income per Share - Schedule of Computation of Net Income per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 25, 2022
Mar. 26, 2021
Mar. 27, 2020
Earnings Per Share [Abstract]      
Net income attributable to Allegro MicroSystems, Inc. $ 119,407 $ 17,953 $ 36,971
Net income attributable to common stockholders, basic 119,555 18,101 37,105
Net income attributable to common stockholders, diluted $ 119,555 $ 18,101 $ 37,105
Basic weighted average common shares (in shares) 189,748,427 83,448,055 10,000,000
Dilutive effect of common stock equivalents (in shares) 2,062,778 92,968,590 0
Diluted weighted average common shares (in shares) 191,811,205 176,416,645 10,000,000
Basic net income attributable to Allegro MicroSystems, Inc. per share (in dollars per share) $ 0.63 $ 0.22 $ 3.70
Basic net income attributable to common stockholders per share (in dollars per share) 0.63 0.22 3.71
Diluted net income attributable to Allegro MicroSystems, Inc. per share (in dollars per share) 0.62 0.10 3.70
Diluted net income attributable to common stockholders per share (in dollars per share) $ 0.62 $ 0.10 $ 3.71