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Retirement Plans | 12 Months Ended
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Mar. 27, 2026
Retirement Benefits [Abstract] |
Retirement Plans | 15. Retirement Plans The Company recognizes the funded status (i.e., the difference between the fair value of plan assets and the benefit obligations) of its defined benefit pension plans in its consolidated balance sheets with a corresponding adjustment to accumulated other comprehensive income (“AOCI”), net of tax. Further, actuarial gains and losses and prior service costs that arise in future periods and are not recognized as net periodic benefit costs in the same periods will be recognized as a component of other comprehensive (loss) income. Those amounts will also be recognized as a component of future net periodic benefit costs consistent with the Company’s past practice. The Company uses a measurement date for its defined benefit pension plans and other postretirement benefit plans that is equivalent to its fiscal year end. Plan Descriptions Non-U.S. Defined Benefit Plan The Company, through its wholly owned subsidiary, Allegro MicroSystems Philippines, Inc., has a defined benefit pension plan, which is a noncontributory plan that covers substantially all employees of this subsidiary. The plan’s assets are invested in government securities, common trust funds, bonds and other debt instruments and stocks. Effect on the consolidated statements of operations Expense related to the non-U.S. defined benefit plan was as follows:
|  | Fiscal Year Ended |
|  | March 27, 2026 |  |  | March 28, 2025 |  |  | March 29, 2024 |
Service cost |  | $ | 1,468 |  |  | $ | 1,456 |  |  | $ | 1,345 |
Interest cost |  |  | 1,042 |  |  |  | 939 |  |  |  | 907 |
Expected return on plan assets |  |  | (487 | ) |  |  | (446 | ) |  |  | (468 | )
Amortization of prior service cost |  |  | (8 | ) |  |  | (8 | ) |  |  | (8 | )
Actuarial loss |  |  | 41 |  |  |  | 71 |  |  |  | 33 |
Net periodic pension expense |  | $ | 2,056 |  |  | $ | 2,012 |  |  | $ | 1,809 |
Changes in the benefit obligations and plan assets for the non-U.S. defined benefit plan were as follows:
|  | Fiscal Year Ended |
|  | March 27, 2026 |  |  | March 28, 2025 |
Obligation and funded status of plan: |  |  |  |  |  |
Benefit obligation at beginning of year |  | $ | 17,299 |  |  | $ | 16,194 |
Service cost |  |  | 1,468 |  |  |  | 1,456 |
Interest cost |  |  | 1,042 |  |  |  | 939 |
Benefits paid |  |  | (695 | ) |  |  | (892 | )
Actuarial (gain) loss |  |  | (1,294 | ) |  |  | 11 |
Foreign currency exchange rate changes |  |  | (688 | ) |  |  | (409 | )
Benefit obligation at end of year |  | $ | 17,132 |  |  | $ | 17,299 |
Change in plan assets: |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | 8,432 |  |  | $ | 7,665 |
Actual return on plan assets |  |  | 608 |  |  |  | 597 |
Employer contributions |  |  | 1,532 |  |  |  | 1,122 |
Benefits paid |  |  | (582 | ) |  |  | (758 | )
Foreign currency exchange rate changes |  |  | (386 | ) |  |  | (194 | )
Fair value of plan assets at end of year |  | $ | 9,604 |  |  | $ | 8,432 |
Underfunded status at end of year |  | $ | (7,528 | ) |  | $ | (8,867 | )
The underfunded plan amounts are recognized as a component of other long-term liabilities in the consolidated balance sheets. The following table presents the obligations and asset information for the non-U.S. defined benefit plan that has a projected benefit obligation in excess of plan assets:
|  | Fiscal Year Ended |
|  | March 27, 2026 |  |  | March 28, 2025 |
Projected benefit obligations |  | $ | 17,132 |  |  | $ | 17,299 |
Plan assets |  |  | 9,604 |  |  |  | 8,432 |
Accumulated benefit obligations |  |  | 10,857 |  |  |  | 10,509 |
The amounts recorded in AOCI for the non-U.S. defined benefit plan for the fiscal years ended March 27, 2026 and March 28, 2025 are further detailed below:
|  | Fiscal Year Ended |
|  | March 27, 2026 |  |  | March 28, 2025 |
Net transition obligation |  | $ | — |  |  | $ | 5 |
Prior service costs |  |  | (73 | ) |  |  | (71 | )
Net actuarial loss |  |  | 894 |  |  |  | 2,322 |
Amounts in AOCI before tax |  |  | 821 |  |  |  | 2,256 |
Less: tax benefit |  |  | 205 |  |  |  | 564 |
Balance, net of tax |  | $ | 616 |  |  | $ | 1,692 |
There is no significant actuarial net gain or loss included in AOCI as of March 27, 2026 that is expected to be amortized into net periodic benefit cost over the next fiscal year. As of March 27, 2026, the Company does not expect a significant return of plan assets during the next 12 months. Assumptions and Investment Policies The actuarial assumptions and methodologies used in determining the projected benefit obligation and net periodic benefit cost are reviewed on an annual basis. The primary assumptions include the Non-U.S. assumed discount rates, the Non-U.S. expected long-term returns on plan assets, and the Non-U.S. rate of compensation increases. Weighted-Average Assumptions Used to Determine Projected Benefit Obligation
|  | March 27, 2026 |  |  | March 28, 2025 |
Non-U.S. assumed discount rate |  |  | 7.27 | % |  |  | 6.33 | %
Non-U.S. rate of compensation increases |  |  | 5.50 | % |  |  | 5.50 | %
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost
|  | March 27, 2026 |  |  | March 28, 2025 |  |  | March 29, 2024 |
Non-U.S. assumed discount rate |  |  | 7.27 | % |  |  | 6.33 | % |  |  | 6.21 | %
Non-U.S. expected long-term return on plan assets |  |  | 5.44 | % |  |  | 5.45 | % |  |  | 5.54 | %
Non-U.S. rate of compensation increases |  |  | 5.50 | % |  |  | 5.50 | % |  |  | 5.50 | %
Information on Plan Assets The table below sets forth the fair value of the entity’s plan assets using the same three-level hierarchy of fair value inputs described in Note 2, “Summary of Significant Accounting Policies”:
|  | Fair Value at March 27, 2026 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets of non-U.S. defined benefit plan: |  |  |  |  |  |  |  |  |  |  |  |
Government securities |  | $ | 3,638 |  |  | $ | 3,638 |  |  | $ | — |  |  | $ | — |
Unit investment trust fund |  |  | 1,915 |  |  |  | — |  |  |  | 1,915 |  |  |  | — |
Loans |  |  | 760 |  |  |  | — |  |  |  | — |  |  |  | 760 |
Bonds |  |  | 313 |  |  |  | — |  |  |  | 313 |  |  |  | — |
Stocks and other investments |  |  | 2,978 |  |  |  | 2,037 |  |  |  | 1 |  |  |  | 940 |
Total |  | $ | 9,604 |  |  | $ | 5,675 |  |  | $ | 2,229 |  |  | $ | 1,700 |
|  | Fair Value at March 28, 2025 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets of non-U.S. defined benefit plan: |  |  |  |  |  |  |  |  |  |  |  |
Government securities |  | $ | 3,023 |  |  | $ | 3,023 |  |  | $ | — |  |  | $ | — |
Unit investment trust fund |  |  | 1,719 |  |  |  | — |  |  |  | 1,719 |  |  |  | — |
Loans |  |  | 654 |  |  |  | — |  |  |  | — |  |  |  | 654 |
Bonds |  |  | 341 |  |  |  | — |  |  |  | 341 |  |  |  | — |
Stocks and other investments |  |  | 2,695 |  |  |  | 1,845 |  |  |  | 3 |  |  |  | 847 |
Total |  | $ | 8,432 |  |  | $ | 4,868 |  |  | $ | 2,063 |  |  | $ | 1,501 |
The following table shows the change in fair value of Level 3 plan assets:
|  | Level 3 Non-U.S. Defined Plan Assets |
|  | Loans |  |  | Stocks |
Balance at March 29, 2024 |  | $ | 574 |  |  | $ | 909 |
Additions |  |  | 475 |  |  |  | — |
Redemptions |  |  | (381 | ) |  |  | — |
Revaluation of debt and equity securities |  |  | — |  |  |  | (39 | )
Change in foreign currency exchange rates |  |  | (14 | ) |  |  | (23 | )
Balance at March 28, 2025 |  | $ | 654 |  |  | $ | 847 |
Additions |  |  | 558 |  |  |  | — |
Redemptions |  |  | (424 | ) |  |  | — |
Revaluation of debt and equity securities |  |  | (2 | ) |  |  | 126 |
Change in foreign currency exchange rates |  |  | (26 | ) |  |  | (33 | )
Balance at March 27, 2026 |  | $ | 760 |  |  | $ | 940 |
The investments in the Company’s major benefit plans largely consist of low-cost, broad-market index funds to mitigate risks of concentration within the market sectors. The appropriate mix of equity and bond investments is determined primarily through the use of detailed asset-liability modeling studies that look to balance the impact of changes in the discount rate against the need to provide asset growth to cover future service cost. The Company has added a greater proportion of fixed income securities to the non-U.S. defined benefit plan with return characteristics that are more closely aligned with changes in liabilities caused by discount rate volatility. There are no significant restrictions on the amount or nature of the investments that may be acquired or held by the plans. Cash Flows During the fiscal years ended March 27, 2026, March 28, 2025 and March 29, 2024, the Company contributed approximately $1,532, $1,122 and $1,230 to its non-U.S. defined benefit plan, respectively. The Company expects to contribute approximately $2,790 to its non-U.S. defined benefit plan in fiscal year 2027. Estimated Future Benefit Payments The following table projects the benefits expected to be paid to participants from the plans in each of the following fiscal years. The majority of the payments will be paid from Company assets.
|  | Pension Benefits |
2027 |  | $ | 1,932 |
2028 |  |  | 1,585 |
2029 |  |  | 1,373 |
2030 |  |  | 1,350 |
2031 |  |  | 1,836 |
Total 5 years thereafter |  |  | 10,961 |
Total |  | $ | 19,037 |
Defined Contribution Plan The Company maintains a 401(k) retirement savings plan (the “401(k) Plan”) for U.S.-based employees who satisfy certain eligibility requirements. Eligible employees may defer a portion of their eligible compensation, within prescribed limits, through contributions to the 401(k) Plan. The Company matches participants’ contributions, up to a maximum of 5% of a participant’s eligible compensation, up to the statutory compensation limit, and these matching contributions are fully vested as of the date they are made. Matching contributions totaled $3,795, $5,910 and $5,956 for the fiscal years ended March 27, 2026, March 28, 2025 and March 29, 2024, respectively. The Company also has a defined contribution plan covering substantially all of its European employees. Contributions to this plan totaled approximately $1,833, $1,957 and $1,549 for the fiscal years ended March 27, 2026, March 28, 2025 and March 29, 2024, respectively.

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