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Net Income per Share (Tables) | 3 Months Ended
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Jun. 25, 2021
Earnings Per Share [Abstract] |
Schedule of Computation of Net (Loss) Income per Share and Unaudited Pro Forma Net Income per Share |
| Three-Month Period Ended |  |
| June 25, 2021 |  | June 26, 2020 |  |  |  |
Net income attributable to Allegro MicroSystems, Inc. | $ | 27,669 |  |  | $ | 4,820 |  |  |  |  |
Net income attributable to common stockholders | 27,707 |  |  | 4,854 |  |  |  |  |
Basic weighted average shares of common stock | 189,585,381 |  |  | 10,000,000 |  |  |  |  |
Dilutive effect of common stock equivalents | 1,577,693 |  |  | — |  |  |  |  |
Diluted weighted average shares of common stock | 191,163,074 |  |  | 10,000,000 |  |  |  |  |
Basic net income attributable to Allegro MicroSystems, Inc. per share | $ | 0.15 |  |  | $ | 0.48 |  |  |  |  |
Basic net income attributable to common stockholders per share | $ | 0.15 |  |  | $ | 0.49 |  |  |  |  |
Diluted net income attributable to Allegro MicroSystems, Inc. per share | $ | 0.14 |  |  | $ | 0.48 |  |  |  |  |
Diluted net income attributable to common stockholders per share | $ | 0.14 |  |  | $ | 0.49 |  |  |  |  |
Schedule of Issuable Weighted Average Share Information | The following represents issuable weighted average share information for the respective periods:
| Three-Month Period Ended |  |
| June 25, 2021 |  | June 26, 2020 |  |  |  |
Restricted stock units | 820,221 |  |  | — |  |  |  |  |
Performance stock units | 752,235 |  |  | — |  |  |  |  |
Employee stock purchase plan | 5,237 |  |  | — |  |  |  |  |
Total | 1,577,693 |  |  | — |  |  |  |  |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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