Earnings Per Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares shares in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Option, RSE and PRSE awards | ||||
| Schedule Of Weighted Average Number Of Shares [Line Items] | ||||
| Anti-dilutive awards excluded from the calculation of diluted weighted-average shares outstanding (in shares) | 2.1 | 1.8 | ||
| Restricted Stock Units (RSUs) | ||||
| Schedule Of Weighted Average Number Of Shares [Line Items] | ||||
| Anti-dilutive awards excluded from the calculation of diluted weighted-average shares outstanding (in shares) | 1.9 | 1.6 | ||