Quarterly report pursuant to Section 13 or 15(d)

Debt And Derivatives - Schedule of Debt (Details)

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Debt And Derivatives - Schedule of Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Sep. 30, 2023
Debt Instrument [Line Items]    
Debt principal $ 1,216,187  
Total debt principal 1,216,187 $ 1,257,529
Less: Unamortized debt-issuance costs and discounts (6,333) (7,536)
Total debt 1,209,854 1,249,993
Less: Current portion of long-term debt (88,517) (86,844)
Long-term debt 1,121,337 1,163,149
Secured Debt | Term Loan A, due 2026    
Debt Instrument [Line Items]    
Debt principal 868,125 909,375
Secured Debt | Term Loan B, due 2028    
Debt Instrument [Line Items]    
Debt principal 343,170 344,934
Subsidiary loan agreements    
Debt Instrument [Line Items]    
Debt principal $ 4,892 $ 3,220