Pension and Other Post-Retirement Benefits

12 Months Ended

Sep. 30, 2021

Retirement Benefits [Abstract]

Pension and Other Post-Retirement Benefits

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. Effective on January 1, 2020, we now match 100% of the first 3% of employee contributions of eligible salaries, and 50% of the next 2% of employee contributions of eligible salaries for a total maximum match of 4%. Additionally, any employer's contributions made after January 1, 2020 will now be vested immediately, and employer contributions made before this date will continue to be vested on the prior schedule. Our contributions to the 401(k) Plan that covers substantially all of our U.S. employees who meet the minimum requirements totaled $13.7 million, $12.0 million and $7.3 million for fiscal years 2021, 2020 and 2019, respectively. We make contributions to various other plans in certain of our foreign operations; total contributions to these plans are not material.

Defined Benefit Plans

We sponsor certain defined benefit plans that are offered primarily by our foreign subsidiaries. Many of these plans were assumed through our acquisitions or 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. Our defined benefit pension income was $0.2 million, $0.4 million, and $0.5 million for fiscal years 2021, 2020, and 2019, respectively. The aggregate projected benefit obligation as of September 30, 2021 and September 30, 2020 was $34.9 million and $35.4 million, respectively. The aggregate net liability of our defined benefit plans as of September 30, 2021 and September 30, 2020 was $10.1 million and $13.2 million, respectively.