Pension and Other Post-Retirement Benefits

12 Months Ended

Sep. 30, 2022

Compensation And Retirement Disclosure [Abstract]

Pension and Other Post-Retirement Benefits

14. Pension and Other Post-Retirement Benefits

Defined Contribution Plans

We have established a retirement savings plan under Section 401(k) of the Internal Revenue Code (the “401(k) Plan”). The 401(k) Plan covers substantially all of our U.S. employees who meet minimum age and service requirements, and allows participants to defer a portion of their annual compensation on a pre-tax basis. We match 50% of employee contributions up to 6% of eligible

salary. We incurred charges for contributions to these 401(k) defined contribution plans of $0.5 million, $0.7 million, and $0.7 million for the fiscal years ended September 30, 2022, 2021 and 2020, respectively.

Defined Benefit Pension Plans

We sponsor certain defined benefit pension plans that are offered primarily by our foreign subsidiaries. Many of these plans are required by local regulatory requirements. We may deposit funds for these plans with insurance companies, third party trustees or into government-managed accounts consistent with local regulatory requirements, as applicable.

The total defined benefit plan pension expenses incurred for these plans were $0.5 million, $0.9 million, and $0.5 million for the fiscal years ended September 30, 2022, 2021 and 2020, respectively. Our aggregate projected benefit obligation and aggregate net liability for defined benefit plans as of September 30, 2022 was $10.4 million and $4.9 million, as of September 30, 2021 was $14.7 million and $8.7 million, and as of September 30, 2020 was $8.3 million and $7.1 million, respectively.

For the fiscal years ended September 30, 2022, 2021 and 2020, charges for contributions to defined benefit pension plans were not material to the Consolidated Statements of Operations.