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Borrowings - Debt Redemption (Details) - Senior Notes
6 Months Ended
Mar. 31, 2024
Sep. 30, 2023
5.875%    
Debt Instrument [Line Items]    
Stated interest rate on debt instrument 5.875% 5.875%
5.875% | Debt Instrument, Redemption, Period One    
Debt Instrument [Line Items]    
Redemption price percentage 100.00%  
5.875% | Debt Instrument, Redemption, Period Two    
Debt Instrument [Line Items]    
Redemption price percentage 102.938%  
5.875% | Debt Instrument, Redemption, Period Three    
Debt Instrument [Line Items]    
Redemption price percentage 101.958%  
5.875% | Debt Instrument, Redemption, Period Four    
Debt Instrument [Line Items]    
Redemption price percentage 100.979%  
5.875% | Debt Instrument, Redemption, Period Five    
Debt Instrument [Line Items]    
Redemption price percentage 100.00%  
7.250%    
Debt Instrument [Line Items]    
Stated interest rate on debt instrument 7.25% 7.25%
7.250% | Debt Instrument, Redemption, Period One    
Debt Instrument [Line Items]    
Redemption price percentage 100.00%  
7.250% | Debt Instrument, Redemption, Period Two    
Debt Instrument [Line Items]    
Redemption price percentage 103.625%  
7.250% | Debt Instrument, Redemption, Period Three    
Debt Instrument [Line Items]    
Redemption price percentage 102.417%  
7.250% | Debt Instrument, Redemption, Period Four    
Debt Instrument [Line Items]    
Redemption price percentage 101.208%  
7.250% | Debt Instrument, Redemption, Period Five    
Debt Instrument [Line Items]    
Redemption price percentage 100.00%  
7.500%    
Debt Instrument [Line Items]    
Stated interest rate on debt instrument 7.50%  
Redemption percentage 35.00%  
Principal amount outstanding, percentage 0.65  
7.500% | Debt Instrument, Redemption, Period One    
Debt Instrument [Line Items]    
Redemption price percentage 107.50%  
7.500% | Debt Instrument, Redemption, Period Two    
Debt Instrument [Line Items]    
Redemption price percentage 100.00%  
7.500% | Debt Instrument, Redemption, Period Three    
Debt Instrument [Line Items]    
Redemption price percentage 103.75%  
7.500% | Debt Instrument, Redemption, Period Four    
Debt Instrument [Line Items]    
Redemption price percentage 101.875%  
7.500% | Debt Instrument, Redemption, Period Five    
Debt Instrument [Line Items]    
Redemption price percentage 100.00%