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Net Income per Share (Tables) | 6 Months Ended
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Sep. 24, 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 |  | Six-Month Period Ended
| September 24, 2021 |  | September 25, 2020 |  | September 24, 2021 |  | September 25, 2020
Net income attributable to Allegro MicroSystems, Inc. | $ | 33,186 |  |  | $ | 9,584 |  |  | $ | 60,855 |  |  | $ | 14,404 |
Net income attributable to common stockholders | 33,223 |  |  | 9,618 |  |  | 60,930 |  |  | 14,472 |
Basic weighted average shares of common stock | 189,673,788 |  |  | 10,000,000 |  |  | 189,629,535 |  |  | 10,000,000 |
Dilutive effect of common stock equivalents | 2,002,634 |  |  | — |  |  | 1,786,715 |  |  | — |
Diluted weighted average shares of common stock | 191,676,422 |  |  | 10,000,000 |  |  | 191,416,250 |  |  | 10,000,000 |
Basic net income attributable to Allegro MicroSystems, Inc. per share | $ | 0.17 |  |  | $ | 0.96 |  |  | $ | 0.32 |  |  | $ | 1.44 |
Basic net income attributable to common stockholders per share | $ | 0.18 |  |  | $ | 0.96 |  |  | $ | 0.32 |  |  | $ | 1.45 |
Diluted net income attributable to Allegro MicroSystems, Inc. per share | $ | 0.17 |  |  | $ | 0.96 |  |  | $ | 0.32 |  |  | $ | 1.44 |
Diluted net income attributable to common stockholders per share | $ | 0.17 |  |  | $ | 0.96 |  |  | $ | 0.32 |  |  | $ | 1.45 |
Schedule of Issuable Weighted Average Share Information | The following table represents issuable weighted average share information for the respective periods:
| Three-Month Period Ended |  | Six-Month Period Ended
| September 24, 2021 |  | September 25, 2020 |  | September 24, 2021 |  | September 25, 2020
Restricted stock units | 1,026,069 |  |  | — |  |  | 922,968 |  |  | — |
Performance stock units | 976,565 |  |  | — |  |  | 863,747 |  |  | — |
Total | 2,002,634 |  |  | — |  |  | 1,786,715 |  |  | — |

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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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