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Debt - Schedule of Long-term Debt Obligations (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Sep. 30, 2020
Feb. 13, 2020
Debt Instrument [Line Items]      
Total debt $ 1,490,000 $ 1,018,000  
Unamortized debt issuance costs for the senior notes (11,073) (12,686)  
Total debt, net of issuance costs 1,478,927 1,005,314  
4.000% Senior Notes Due 2028      
Debt Instrument [Line Items]      
Senior Notes     $ 500,000
3.625% Senior Notes Due 2025      
Debt Instrument [Line Items]      
Senior Notes     $ 500,000
Long-term Debt [Member] | Line of Credit      
Debt Instrument [Line Items]      
Credit facility revolver 490,000 18,000  
Long-term Debt [Member] | 4.000% Senior Notes Due 2028      
Debt Instrument [Line Items]      
Senior Notes 500,000 500,000  
Long-term Debt [Member] | 3.625% Senior Notes Due 2025      
Debt Instrument [Line Items]      
Senior Notes $ 500,000 $ 500,000