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Net (Loss) Income per Share (Tables) | 12 Months Ended
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Mar. 27, 2026
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 (loss) income attributable to Allegro MicroSystems, Inc. per share.
|  | Fiscal Year Ended |
|  | March 27, 2026 |  |  | March 28, 2025 |  |  | March 29, 2024 |
Net (loss) income attributable to Allegro MicroSystems, Inc. |  | $ | (14,897 | ) |  | $ | (73,010 | ) |  | $ | 152,697 |
Basic weighted average common shares |  |  | 185,035,670 |  |  |  | 187,707,391 |  |  |  | 192,573,169 |
Dilutive effect of common stock equivalents |  |  | — |  |  |  | — |  |  |  | 2,101,183 |
Diluted weighted average common shares |  |  | 185,035,670 |  |  |  | 187,707,391 |  |  |  | 194,674,352 |
Basic net (loss) income per common share attributable to Allegro MicroSystems, Inc. stockholders |  | $ | (0.08 | ) |  | $ | (0.39 | ) |  | $ | 0.79 |
Diluted net (loss) income per common share attributable to Allegro MicroSystems, Inc. stockholders |  | $ | (0.08 | ) |  | $ | (0.39 | ) |  | $ | 0.78 |
Schedule of Anti Dilutive Securities Excluded | The computed net (loss) income per share for the fiscal years ended March 27, 2026, March 28, 2025 and March 29, 2024 does not assume conversion of securities that would have an antidilutive effect on net (loss) 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 (loss) income per share, as such securities would have an antidilutive effect on net (loss) income per share if the Company had reported net income for the respective periods:
|  | Fiscal Year Ended |
|  | March 27, 2026 |  |  | March 28, 2025 |  |  | March 29, 2024 |
RSUs |  |  | 11,940 |  |  |  | 451,087 |  |  |  | 40,257 |
PSUs |  |  | 21,248 |  |  |  | 91,210 |  |  |  | 129,837 |
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 (“ESPP”) for the respective period:
|  | Fiscal Year Ended |
|  | March 27, 2026 |  |  | March 28, 2025 |  |  | March 29, 2024 |
RSUs |  |  | — |  |  |  | — |  |  |  | 888,811 |
PSUs |  |  | — |  |  |  | — |  |  |  | 1,210,124 |
ESPP |  |  | — |  |  |  | — |  |  |  | 2,248 |
Total |  |  | — |  |  |  | — |  |  |  | 2,101,183 |

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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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