Debt - Schedule of Long-term Debt Obligations (Details) - USD ($)		Mar. 31, 2023	Sep. 30, 2022	Feb. 13, 2020
Debt Instrument [Line Items]
Total debt		$ 1,925,000,000	$ 1,359,000,000
Unamortized debt issuance costs for the senior notes	[1]	(7,297,000)	(8,372,000)
Total debt, net of issuance costs		1,917,703,000	1,350,628,000
4.000% Senior Notes Due 2028
Debt Instrument [Line Items]
Senior Notes				$ 500,000,000
3.625% Senior Notes Due 2025
Debt Instrument [Line Items]
Senior Notes				$ 500,000,000
Long-term Debt [Member] | Line of Credit
Debt Instrument [Line Items]
Credit facility revolvering line	[2]	425,000,000	359,000,000
Credit facility term loan	[2]	500,000,000	0
Long-term Debt [Member] | 4.000% Senior Notes Due 2028
Debt Instrument [Line Items]
Senior Notes		500,000,000	500,000,000
Long-term Debt [Member] | 3.625% Senior Notes Due 2025
Debt Instrument [Line Items]
Senior Notes		$ 500,000,000	$ 500,000,000

[1] Unamortized debt issuance costs for the senior notes are included in Long-term debt on the Consolidated Balance Sheets.

[2] Unamortized debt issuance costs related to the credit facility were $2.3 million included in Other current assets and $8.7 million included in Other assets on the Consolidated Balance Sheet as of March 31, 2023 and $2.7 million included in Other assets on the Consolidated Balance Sheet as of September 30, 2022.