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Senior Notes - Principal Amounts Carrying Amounts and Fair Values (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Sep. 30, 2022
Debt Instrument [Line Items]    
Carrying amounts $ 1,300,000 $ 1,300,000
Fair value 1,189,250 1,148,750
Debt issuance costs 11,500 14,300
May 2018 Senior Notes    
Debt Instrument [Line Items]    
Carrying amounts 400,000 400,000
Fair value 386,000 381,500
December 2019 Senior Notes    
Debt Instrument [Line Items]    
Carrying amounts 900,000 900,000
Fair value $ 803,250 $ 767,250