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Net Income per Share (Tables) | 9 Months Ended
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Dec. 29, 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 |  |  | Nine-Month Period Ended |
|  | December 29, 2023 |  |  | December 23, 2022 |  |  | December 29, 2023 |  |  | December 23, 2022 |
Net income attributable to common stockholders |  | $ | 33,402 |  |  | $ | 64,551 |  |  | $ | 159,962 |  |  | $ | 125,482 |
Basic weighted average shares of common stock |  |  | 192,724,541 |  |  |  | 191,328,538 |  |  |  | 192,384,315 |  |  |  | 191,082,141 |
Dilutive effect of common stock equivalents |  |  | 1,845,839 |  |  |  | 2,607,370 |  |  |  | 2,540,725 |  |  |  | 2,018,621 |
Diluted weighted average shares of common stock |  |  | 194,570,380 |  |  |  | 193,935,908 |  |  |  | 194,925,040 |  |  |  | 193,100,762 |
Basic net income attributable to common stockholders per share |  | $ | 0.17 |  |  | $ | 0.34 |  |  | $ | 0.83 |  |  | $ | 0.66 |
Diluted net income attributable to common stockholders per share |  | $ | 0.17 |  |  | $ | 0.33 |  |  | $ | 0.82 |  |  | $ | 0.65 |
Schedule Of Anti Dilutive Securities Excluded | The computed net income per share for the three- and nine-month periods ended December 29, 2023 and December 23, 2022 does not assume conversion of securities that would have an antidilutive effect on income per share. The following represents contingently issuable shares under the restricted stock units (“RSUs”) and performance-based restricted stock units (“PSUs”) excluded from the computation of net income per share, as such securities would have an antidilutive effect on net income per share:
|  | Three-Month Period Ended |  |  | Nine-Month Period Ended |
|  | December 29, 2023 |  |  | December 23, 2022 |  |  | December 29, 2023 |  |  | December 23, 2022 |
Restricted stock units |  |  | 882,656 |  |  |  | 12,620 |  |  |  | 18,811 |  |  |  | 24,273 |
Performance stock units |  |  | 246,073 |  |  |  | — |  |  |  | 110,263 |  |  |  | — |
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 |  |  | Nine-Month Period Ended |
|  | December 29, 2023 |  |  | December 23, 2022 |  |  | December 29, 2023 |  |  | December 23, 2022 |
Restricted stock units |  |  | 557,405 |  |  |  | 973,417 |  |  |  | 917,491 |  |  |  | 752,637 |
Performance stock units |  |  | 1,287,519 |  |  |  | 1,612,824 |  |  |  | 1,607,797 |  |  |  | 1,244,855 |
Employee stock purchase plan |  |  | 915 |  |  |  | 21,129 |  |  |  | 15,437 |  |  |  | 21,129 |
Total |  |  | 1,845,839 |  |  |  | 2,607,370 |  |  |  | 2,540,725 |  |  |  | 2,018,621 |

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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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