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Net (Loss) Income per Share - Schedule of Computation of Net Income per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Dec. 25, 2020
Dec. 27, 2019
Dec. 25, 2020
Dec. 27, 2019
Earnings Per Share [Abstract]        
Net (loss) income attributable to Allegro MicroSystems, Inc. $ (5,095) $ 8,926 $ 9,309 $ 23,675
Net (loss) income attributable to common stockholders, basic (5,060) 8,958 9,412 23,776
Net (loss) income attributable to common stockholders, diluted $ (5,060) $ 8,958 $ 9,412 $ 23,776
Basic weighted average common shares (in shares) 124,363,078 10,000,000 48,121,026 10,000,000
Dilutive effect of common stock equivalents (in shares) 0 0 123,517,761 0
Diluted weighted average common shares (in shares) 124,363,078 10,000,000 171,638,787 10,000,000
Basic net (loss) income attributable to Allegro MicroSystems, Inc. per share (in dollars per share) $ (0.04) $ 0.89 $ 0.19 $ 2.37
Basic net (loss) income attributable to common stockholders per share (in dollars per share) (0.04) 0.90 0.20 2.38
Diluted net (loss) income attributable to Allegro MicroSystems, Inc. per share (in dollars per share) (0.04) 0.89 0.05 2.37
Diluted net (loss) income attributable to common stockholders per share (in dollars per share) $ (0.04) $ 0.90 $ 0.05 $ 2.38