401(k) and Profit Sharing Plan (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Sep. 30, 2024 |
Sep. 30, 2023 |
Sep. 30, 2022 |
|
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined contribution plan, expense recognized | $ 7,600,000 | $ 7,300,000 | $ 6,800,000 |
| Defined Contribution Plan, Plan Name [Extensible List] | U.S. 401(k) Plan | ||
| Profit sharing plan, expense recognized | $ 0 | $ 0 | $ 0 |
| U.S. 401(k) Plan | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Contribution Plan, Plan Name [Extensible List] | U.S. 401(k) Plan | ||
| Puerto Rico 401(k) Plan | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Contribution Plan, Plan Name [Extensible List] | Puerto Rico 401(k) Plan | ||
| Defined Contribution Plan, minimum employment period for contribution to plan | 1 year | ||