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Net (Loss) Income per Share (Tables)
 9 Months Ended
Dec. 25, 2020
Earnings Per Share [Abstract]  
Schedule of Computation of Net (Loss) Income per Share and Unaudited Pro Forma Net Income per Share
Three-Month Period EndedNine-Month Period Ended
December 25,
2020		December 27,
2019		December 25,
2020		December 27,
2019
Net (loss) income attributable to Allegro MicroSystems, Inc.$(5,095)$8,926 $9,309 $23,675 
Net (loss) income attributable to common stockholders(5,060)8,958 9,412 23,776 
Basic weighted average shares of common stock124,363,078 10,000,000 48,121,026 10,000,000 
Dilutive effect of common stock equivalents— — 123,517,761 — 
Diluted weighted average shares of common stock124,363,078 10,000,000 171,638,787 10,000,000 
Basic net (loss) income attributable to Allegro MicroSystems, Inc. per share$(0.04)$0.89 $0.19 $2.37 
Basic net (loss) income attributable to common stockholders per share$(0.04)$0.90 $0.20 $2.38 
Diluted net (loss) income attributable to Allegro MicroSystems, Inc. per share$(0.04)$0.89 $0.05 $2.37 
Diluted net (loss) income attributable to common stockholders per share$(0.04)$0.90 $0.05 $2.38 
Schedule of Issuable Weighted Average Share Information
The following represents issuable weighted average share information for the respective periods:
Three-Month Period EndedNine-Month Period Ended
December 25,
2020		December 27,
2019		December 25,
2020		December 27,
2019
Unvested restricted stock units (“RSUs”)377,767 — 125,922 — 
Unvested performance stock units (“PSUs”)422,768 — 140,923 — 
Shares related to Common Stock Conversion56,752,747 — 123,250,916 — 
Total57,553,282 — 123,517,761 —