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Net Income per Share (Tables)
 9 Months Ended
Dec. 24, 2021
Earnings Per Share [Abstract]  
Schedule of Computation of Net Income per Share
The following table sets forth the basic and diluted net income attributable to Allegro MicroSystems, Inc. per share. The number of shares of common stock reflected in the calculation is the total shares of common stock (vested and unvested) held on the IPO date, after the Common Stock Conversion.
Three-Month Period EndedNine-Month Period Ended
December 24,
2021		December 25,
2020		December 24,
2021		December 25,
2020
Net income attributable to Allegro MicroSystems, Inc.$32,936 $(5,095)$93,791 $9,309 
Net income attributable to common stockholders32,973 (5,060)93,903 9,412 
Basic weighted average shares of common stock189,736,901 124,363,078 189,665,324 48,121,026 
Dilutive effect of common stock equivalents2,331,321 — 2,013,627 123,517,761 
Diluted weighted average shares of common stock192,068,222 124,363,078 191,678,951 171,638,787 
Basic net income attributable to Allegro MicroSystems, Inc. per share$0.17 $(0.04)$0.49 $0.19 
Basic net income attributable to common stockholders per share$0.17 $(0.04)$0.50 $0.20 
Diluted net income attributable to Allegro MicroSystems, Inc. per share$0.17 $(0.04)$0.49 $0.05 
Diluted net income attributable to common stockholders per share$0.17 $(0.04)$0.49 $0.05 
Schedule of Issuable Weighted Average Share Information
The following table represents issuable weighted average share information for the respective periods:
Three-Month Period EndedNine-Month Period Ended
December 24,
2021		December 25,
2020		December 24,
2021		December 25,
2020
Restricted stock units1,199,816 377,767 1,046,229 125,922 
Performance stock units1,117,532 422,768 959,084 140,923 
Employee stock purchase plan13,973 — 8,314 — 
Shares related to Common Stock Conversion— 56,752,747 — 123,250,916 
Total2,331,321 57,553,282 2,013,627 123,517,761