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Borrowings - Narrative (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 01, 2022
Sep. 09, 2019
USD ($)
Jun. 01, 2012
Jan. 31, 2010
USD ($)
Mar. 31, 2022
USD ($)
lender
Mar. 31, 2021
USD ($)
Mar. 31, 2022
USD ($)
lender
Mar. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
May 31, 2018
USD ($)
Oct. 31, 2017
Senior Notes [Abstract]                      
Ownership interest In guarantor subsidiaries         100.00%   100.00%        
Loss on extinguishment of debt, net         $ 164,000 $ 563,000 $ 164,000 $ 563,000      
Junior Subordinated Notes                      
Junior Subordinated Notes [Abstract]                      
Aggregate principle balance of notes         $ 100,800,000   $ 100,800,000        
Weighted average fixed interest rate of debt         3.87%   3.87%        
Unamortized accretion         $ 29,536,000   $ 29,536,000   $ 30,570,000    
Junior Subordinated Debt, Modified Terms                      
Unsecured Debt [Abstract]                      
Aggregate principal amount of debt       $ 75,000,000              
Junior Subordinated Notes [Abstract]                      
Redemption price percentage     75.00%                
Junior Subordinated Debt, Modified Terms | LIBOR                      
Junior Subordinated Notes [Abstract]                      
Variable rate floor       4.25%              
Variable rate cap       9.25%              
Junior Subordinated Debt, Modified Terms | Forecast                      
Junior Subordinated Notes [Abstract]                      
Annual increase of percentage of principal amount redeemable 1.785%                    
Junior Subordinated Debt, Original Terms                      
Unsecured Debt [Abstract]                      
Aggregate principal amount of debt         25,800,000   $ 25,800,000        
Junior Subordinated Debt, Original Terms | LIBOR                      
Junior Subordinated Notes [Abstract]                      
Basis spread on variable rate             2.45%        
Senior Unsecured Term Loans September 2022 | Senior Notes                      
Unsecured Debt [Abstract]                      
Aggregate principal amount of debt         50,000,000   $ 50,000,000        
Periodic payment   $ 50,000,000                  
Stated interest rate on debt instrument   4.875%                  
5 7/8% Senior Notes (2027 Notes) | Senior Notes                      
Senior Notes [Abstract]                      
Extinguishment of debt         6,000,000   6,000,000        
Loss on extinguishment of debt, net         $ 200,000   $ 200,000        
5 7/8% Senior Notes (2027 Notes) | Senior Notes                      
Unsecured Debt [Abstract]                      
Stated interest rate on debt instrument         5.88%   5.88%       5.88%
Junior Subordinated Notes [Abstract]                      
Redemption price percentage             105.875%        
Revolving Credit Facility                      
Line of Credit Facility [Abstract]                      
Credit facility borrowing capacity         $ 250,000,000   $ 250,000,000        
Number of lenders | lender         4   4        
Borrowings outstanding         $ 0   $ 0   0    
Letters of credit secured using cash collateral         0   0   0    
Amount of available borrowings under the secured revolving credit facility         250,000,000   250,000,000   250,000,000    
Letter of Credit                      
Line of Credit Facility [Abstract]                      
Letters of credit secured using cash collateral         26,400,000   26,400,000   21,800,000    
Collateral amount         26,100,000   26,100,000   $ 22,300,000    
Standby Letters of Credit | Standby Letters for Credit Facility                      
Line of Credit Facility [Abstract]                      
Credit facility borrowing capacity                   $ 50,000,000  
Letters of credit secured using cash collateral         8,200,000   8,200,000        
Standby Letters of Credit | Backstop Standby Letters of Credit                      
Line of Credit Facility [Abstract]                      
Credit facility borrowing capacity         $ 40,000,000   $ 40,000,000