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Borrowings - Narrative (Details)
1 Months Ended 12 Months Ended
Jun. 01, 2022
Sep. 09, 2019
USD ($)
Jun. 01, 2012
Jan. 31, 2010
USD ($)
Sep. 30, 2021
USD ($)
lender
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
May 31, 2018
USD ($)
Oct. 31, 2017
Senior Notes [Abstract]                  
Ownership interest In guarantor subsidiaries         100.00%        
Loss on extinguishment of debt, net         $ 2,025,000 $ 0 $ 24,920,000    
Senior Notes | Senior Unsecured Term Loans September 2022                  
Senior Unsecured Term Loan [Abstract]                  
Aggregate principal amount of debt   $ 50,000,000              
Periodic payment   $ 50,000,000              
Stated interest rate on debt instrument   4.875%              
Junior Subordinated Notes [Abstract]                  
Debt Instrument, Face Amount   $ 50,000,000              
Senior Notes | 5 7/8% Senior Notes (2027 Notes)                  
Senior Unsecured Term Loan [Abstract]                  
Stated interest rate on debt instrument         5.88%       0.0588%
Senior Notes [Abstract]                  
Repurchased senior debt           30,700,000      
Loss on extinguishment of debt, net         $ (2,000,000)        
Junior Subordinated Notes [Abstract]                  
Redemption price percentage         105.875%        
Junior Subordinated Notes                  
Junior Subordinated Notes [Abstract]                  
Aggregate principle balance of notes         $ 100,800,000        
Weighted average fixed interest rate of debt (percent)         3.82%        
Unamortized discount         $ 30,600,000        
Junior Subordinated Debt, Modified Terms                  
Senior Unsecured Term Loan [Abstract]                  
Aggregate principal amount of debt       $ 75,000,000          
Junior Subordinated Notes [Abstract]                  
Debt Instrument, Face Amount       $ 75,000,000          
Redemption price percentage     75.00%            
Junior Subordinated Debt, Modified Terms | Forecast                  
Junior Subordinated Notes [Abstract]                  
Annual increase of percentage of principal amount redeemable 1.785%                
Junior Subordinated Debt, Modified Terms | London Interbank Offered Rate (LIBOR)                  
Junior Subordinated Notes [Abstract]                  
Variable rate floor       4.25%          
Variable rate cap       9.25%          
Junior Subordinated Debt, Original Terms                  
Senior Unsecured Term Loan [Abstract]                  
Aggregate principal amount of debt         25,800,000        
Junior Subordinated Notes [Abstract]                  
Debt Instrument, Face Amount         $ 25,800,000        
Junior Subordinated Debt, Original Terms | London Interbank Offered Rate (LIBOR)                  
Junior Subordinated Notes [Abstract]                  
Basis spread on variable rate         2.45%        
Revolving Credit Facility                  
Line of Credit Facility [Abstract]                  
Maximum borrowing capacity         $ 250,000,000        
Line of credit facility, number of lenders | lender         4        
Inventory assets pledged as collateral         $ 1,100,000,000        
Revolving Credit Facility         0 0      
Letters of credit secured using cash collateral         0 0      
Line of credit facility, remaining borrowing capacity         250,000,000        
Letter of Credit                  
Line of Credit Facility [Abstract]                  
Letters of credit secured using cash collateral         21,800,000 12,700,000      
Collateral amount         22,300,000 $ 12,900,000      
Standby Letters of Credit | Standby Letter for Credit Facility                  
Line of Credit Facility [Abstract]                  
Maximum borrowing capacity               $ 50,000,000  
Letters of credit secured using cash collateral         $ 11,800,000        
Standby Letters of Credit | Backstop Standby Letters of Credit                  
Line of Credit Facility [Abstract]                  
Maximum borrowing capacity               $ 40,000,000