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Net (Loss) Income per Share (Tables) | 9 Months Ended
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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 Ended |  | Nine-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 stock | 124,363,078 |  |  | 10,000,000 |  |  | 48,121,026 |  |  | 10,000,000 |
Dilutive effect of common stock equivalents | — |  |  | — |  |  | 123,517,761 |  |  | — |
Diluted weighted average shares of common stock | 124,363,078 |  |  | 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 Ended |  | Nine-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 Conversion | 56,752,747 |  |  | — |  |  | 123,250,916 |  |  | — |
Total | 57,553,282 |  |  | — |  |  | 123,517,761 |  |  | — |

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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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