Accumulated Stockholders' Equity - Share Repurchase Program (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Sep. 30, 2024 |
Sep. 30, 2023 |
Sep. 30, 2022 |
|
| Stockholders' Equity Note [Abstract] | |||
| Amount of shares authorized to be repurchased | $ 1,000,000,000.0 | ||
| Number of shares surrendered by grantees to satisfy personal income tax withholdings obligations upon vesting of equity-based awards | 194,000 | 93,000 | 59,000 |
| Shares surrendered by grantees to satisfy personal income tax withholdings obligations upon vesting of equity-based awards, value | $ 1,800,000 | $ 1,200,000 | $ 1,200,000 |