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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. 26, 2021
Mar. 27, 2020
Mar. 29, 2019
Earnings Per Share [Abstract]      
Net income attributable to Allegro MicroSystems, Inc. $ 17,953 $ 36,971  
Net income attributable to common stockholders, basic 18,101 37,105  
Net income attributable to common stockholders, diluted $ 18,101 $ 37,105  
Basic weighted average common shares (in shares) 83,448,055 10,000,000  
Dilutive effect of common stock equivalents (in shares) 92,968,590 0  
Diluted weighted average common shares (in shares) 176,416,645 10,000,000 10,000,000
Basic net income attributable to Allegro MicroSystems, Inc. per share (in dollars per share) $ 0.22 $ 3.70  
Basic net income attributable to common stockholders per share (in dollars per share) 0.22 3.71  
Diluted net income attributable to Allegro MicroSystems, Inc. per share (in dollars per share) 0.10 3.70  
Diluted net income attributable to common stockholders per share (in dollars per share) $ 0.10 $ 3.71