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Net Income per Share (Tables) | 3 Months Ended
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Jun. 30, 2023
Earnings Per Share [Abstract] |
Schedule of Computation of Net (Loss) Income per Share and Unaudited Pro Forma Net Income per Share | The following table sets forth the basic and diluted net income per common share attributable to Allegro MicroSystems, Inc.
| Three-Month Period Ended |
| June 30, 2023 |  | June 24, 2022 |
Net income attributable to common stockholders | $ | 60,889 |  |  | $ | 10,283 |  |
Basic weighted average shares of common stock | 191,997,330 |  |  | 190,638,135 |  |
Dilutive effect of common stock equivalents | 2,994,576 |  |  | 1,768,141 |  |
Diluted weighted average shares of common stock | 194,991,906 |  |  | 192,406,276 |  |
Basic net income attributable to common stockholders per share | $ | 0.32 |  |  | $ | 0.05 |  |
Diluted net income attributable to common stockholders per share | $ | 0.31 |  |  | $ | 0.05 |  |
Schedule Of Anti Dilutive Securities Excluded | :
| Three-Month Period Ended |
| June 30, 2023 |  | June 24, 2022 |
Restricted stock units (RSUs) | — |  |  | 19,272 |  |
Performance stock units (PSUs) | 65,943 |  |  | 46,991 |  |
Schedule of Issuable Weighted Average Share Information | The following table represents issued and issuable weighted average share information underlying our outstanding RSUs, PSUs and participation in our employee stock purchase plan for the respective periods:
| Three-Month Period Ended |
| June 30, 2023 |  | June 24, 2022 |
Restricted stock units | 1,163,894 |  |  | 668,259 |  |
Performance stock units | 1,809,200 |  |  | 1,080,201 |  |
Employee stock purchase plan | 21,482 |  |  | 19,681 |  |
Total | 2,994,576 |  |  | 1,768,141 |  |

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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 -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + 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 -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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