v3.26.1
Long-Term Debt - Narrative (Details) - USD ($)
6 Months Ended
Mar. 31, 2022
Mar. 31, 2026
Mar. 31, 2025
Debt Instrument [Line Items]      
Amortization of debt issuance costs   $ 3,800,000 $ 4,100,000
Interest paid   $ 44,100,000  
Weighted-average interest rate   6.10%  
Fair Value | Level 2      
Debt Instrument [Line Items]      
Long-term debt   $ 1,294,800,000  
Reported Value Measurement | Level 2      
Debt Instrument [Line Items]      
Long-term debt   1,326,400,000  
Term Loan due March 2029 | Secured Debt      
Debt Instrument [Line Items]      
Face amount $ 950,000,000.0    
Term 7 years    
Basis spread on variable rate 3.00%    
Variable rate floor 0.50%    
Discount percentage 0.50%    
Quarterly payment as a percentage of principal 0.25%    
Repayment of debt   75,000,000.0  
Repayment of secured debt, discretionary   70,300,000  
Revolving Credit Facility | Secured Debt | Revolving Credit Facility      
Debt Instrument [Line Items]      
Term 5 years    
Maximum borrowing capacity $ 500,000,000.0    
Commitment fee percentage 0.25%    
Amount drawn   $ 0  
5.00% Senior Secured Notes due 2030 | Senior Notes      
Debt Instrument [Line Items]      
Stated interest rate   5.00%  
6.75% Senior Secured Notes due 2030 | Senior Notes      
Debt Instrument [Line Items]      
Stated interest rate   6.75%