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Net Income (Loss) per Share (Tables) | 6 Months Ended
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Sep. 26, 2025
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 (loss) attributable to Allegro MicroSystems, Inc. per share:
|  | Three-Month Period Ended |  |  | Six-Month Period Ended |
|  | September 26, 2025 |  |  | September 27, 2024 |  |  | September 26, 2025 |  |  | September 27, 2024 |
Net income (loss) attributable to Allegro MicroSystems, Inc. |  | $ | 6,519 |  |  | $ | (33,675 | ) |  | $ | (6,708 | ) |  | $ | (51,350 | )
Basic weighted average common shares |  |  | 185,074,119 |  |  |  | 189,182,850 |  |  |  | 184,830,588 |  |  |  | 191,324,281 |
Dilutive effect of common stock equivalents |  |  | 1,231,666 |  |  |  | — |  |  |  | — |  |  |  | — |
Diluted weighted average common shares |  |  | 186,305,785 |  |  |  | 189,182,850 |  |  |  | 184,830,588 |  |  |  | 191,324,281 |
Basic net income (loss) per common share attributable to Allegro MicroSystems, Inc. stockholders |  | $ | 0.04 |  |  | $ | (0.18 | ) |  | $ | (0.04 | ) |  | $ | (0.27 | )
Diluted net income (loss) per common share attributable to Allegro MicroSystems, Inc. stockholders |  | $ | 0.03 |  |  | $ | (0.18 | ) |  | $ | (0.04 | ) |  | $ | (0.27 | )
Schedule of Anti Dilutive Securities Excluded | The computed net income (loss) per share for the three- and six-month periods ended September 26, 2025 and September 27, 2024 does not assume conversion of securities that would have an antidilutive effect on net income (loss) 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 (loss) per share, as such securities would have an antidilutive effect on net income (loss) per share if the Company had reported net income for those periods:
|  | Three-Month Period Ended |  |  | Six-Month Period Ended |
|  | September 26, 2025 |  |  | September 27, 2024 |  |  | September 26, 2025 |  |  | September 27, 2024 |
RSUs |  |  | 5,386 |  |  |  | 1,644,248 |  |  |  | 190,751 |  |  |  | 1,177,126 |
PSUs |  |  | — |  |  |  | 607,984 |  |  |  | — |  |  |  | 416,869 |
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 three- and six-month periods ended September 26, 2025 and September 27, 2024.
|  | Three-Month Period Ended |  |  | Six-Month Period Ended |
|  | September 26, 2025 |  |  | September 27, 2024 |  |  | September 26, 2025 |  |  | September 27, 2024 |
RSUs |  |  | 928,801 |  |  |  | — |  |  |  | — |  |  |  | — |
PSUs |  |  | 302,865 |  |  |  | — |  |  |  | — |  |  |  | — |
ESPP |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total |  |  | 1,231,666 |  |  |  | — |  |  |  | — |  |  |  | — |

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