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Net Income per Share - Schedule of Computation of Net Income per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Jun. 25, 2021
Jun. 26, 2020
Earnings Per Share [Abstract]    
Net income attributable to Allegro MicroSystems, Inc. $ 27,669 $ 4,820
Net (loss) income attributable to common stockholders, basic 27,707 4,854
Net (loss) income attributable to common stockholders, diluted $ 27,707 $ 4,854
Basic weighted average common shares (in shares) 189,585,381 10,000,000
Dilutive effect of common stock equivalents (in shares) 1,577,693 0
Diluted weighted average common shares (in shares) 191,163,074 10,000,000
Basic net income attributable to Allegro MicroSystems, Inc. per share (in dollars per share) $ 0.15 $ 0.48
Basic net income attributable to common stockholders per share (in dollars per share) 0.15 0.49
Diluted net income attributable to Allegro MicroSystems, Inc. per share (in dollars per share) 0.14 0.48
Diluted net income attributable to common stockholders per share (in dollars per share) $ 0.14 $ 0.49