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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 6 Months Ended
Sep. 24, 2021
Sep. 25, 2020
Sep. 24, 2021
Sep. 25, 2020
Earnings Per Share [Abstract]        
Net income attributable to Allegro MicroSystems, Inc. $ 33,186 $ 9,584 $ 60,855 $ 14,404
Net (loss) income attributable to common stockholders, basic 33,223 9,618 60,930 14,472
Net (loss) income attributable to common stockholders, diluted $ 33,223 $ 9,618 $ 60,930 $ 14,472
Basic weighted average shares of common stock (in shares) 189,673,788 10,000,000 189,629,535 10,000,000
Dilutive effect of common stock equivalents (in shares) 2,002,634 0 1,786,715 0
Diluted weighted average common shares (in shares) 191,676,422 10,000,000 191,416,250 10,000,000
Basic net income attributable to Allegro MicroSystems, Inc. per share (in dollars per share) $ 0.17 $ 0.96 $ 0.32 $ 1.44
Basic net income attributable to common stockholders per share (in dollars per share) 0.18 0.96 0.32 1.45
Diluted net income attributable to Allegro MicroSystems, Inc. per share (in dollars per share) 0.17 0.96 0.32 1.44
Diluted net income attributable to common stockholders per share (in dollars per share) $ 0.17 $ 0.96 $ 0.32 $ 1.45