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Net Income per Share (Tables) | 12 Months Ended
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Mar. 26, 2021
Earnings Per Share [Abstract] |
Schedule of Computation of Net Income per Share and Unaudited Pro Forma Net Income per Share | The following table sets forth the basic and diluted net (loss) 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.
|  | Fiscal Year Ended
|  | March 26, 2021 |  | March 27, 2020 |  |
Net income attributable to Allegro MicroSystems, Inc. |  | $ | 17,953 |  |  | $ | 36,971 |  |  |
Net income attributable to common stockholders |  | 18,101 |  |  | 37,105 |  |  |
Basic weighted average common shares |  | 83,448,055 |  |  | 10,000,000 |  |  |
Dilutive effect of common stock equivalents |  | 92,968,590 |  |  | — |  |  |
Diluted weighted average common shares |  | 176,416,645 |  |  | 10,000,000 |  |  |
Basic net income attributable to Allegro MicroSystems, Inc. per share |  | $ | 0.22 |  |  | $ | 3.70 |  |  |
Basic net income attributable to common stockholders per share |  | $ | 0.22 |  |  | $ | 3.71 |  |  |
Diluted net income attributable to Allegro MicroSystems, Inc. per share |  | $ | 0.10 |  |  | $ | 3.70 |  |  |
Diluted net income attributable to common stockholders per share |  | $ | 0.10 |  |  | $ | 3.71 |  |  |
Schedule of Weighted Average Number of Shares | The following represents issued and issuable weighted average share information for the respective periods:
|  | Fiscal Year Ended
|  | March 26, 2021 |  | March 27, 2020 |  |
Restricted stock units |  | 308,811 |  |  | — |  |  |
Performance stock units |  | 218,678 |  |  | — |  |  |
Employee stock purchase plan |  | 2,914 |  |  | — |  |  |
Shares related to Common Stock Conversion |  | 92,438,187 |  |  | — |  |  |
Total |  | 92,968,590 |  |  | — |  |  |

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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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