Stock Incentive Plans - Summary of Performance Shares/units Granted (Details) - Performance Shares [Member] - $ / shares shares in Thousands		12 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, start date		Oct. 01, 2023	Oct. 01, 2022	Oct. 01, 2021
Vesting period, end date		Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2024
Target shares granted	[1]	140	98	110
Weighted-average fair value per share	[1]	$ 81.29	$ 135.93	$ 131.33

[1] At the end of the performance period, the actual number of shares/units awarded can range from zero to 200% of the target shares/units granted, which is assumed to be 100%. Both the shares granted and weighted-average fair value per share/unit are as of the grant date.