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Borrowings - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 01, 2022
Jun. 01, 2012
Jan. 31, 2010
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Jan. 28, 2025
Jan. 27, 2025
Sep. 30, 2024
Debt Instrument [Line Items]                    
Debt repurchased       $ 0 $ 0 $ 0 $ 0      
Loss on extinguishment of debt, net       0 $ 0 0 437      
Senior Notes | 6 .750% Senior Notes Maturing March of 2025                    
Debt Instrument [Line Items]                    
Extinguishment of debt             202,200      
Loss on extinguishment of debt, net             $ 400      
Junior Subordinated Notes                    
Debt Instrument [Line Items]                    
Unamortized accretion       22,819   22,819       $ 24,369
Junior Subordinated Notes                    
Debt Instrument [Line Items]                    
Aggregate principle balance of notes       $ 100,800   $ 100,800        
Weighted average fixed interest rate of debt       6.99%   6.99%        
Junior Subordinated Debt, Modified Terms                    
Debt Instrument [Line Items]                    
Aggregate principal amount of debt     $ 75,000              
Variable rate floor     4.25%              
Variable rate cap     9.25%              
Redemption price percentage   75.00%                
Annual increase of percentage of principal amount redeemable 1.785%                  
Junior Subordinated Debt, Original Terms                    
Debt Instrument [Line Items]                    
Aggregate principal amount of debt       $ 25,800   $ 25,800        
Basis spread on variable rate     2.71%              
Senior Unsecured Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Credit facility, maximum borrowing capacity, including letters of credit       400,000   400,000        
Credit facility, available increase in borrowing capacity       35,000   35,000        
Senior unsecured revolving credit facility       115,000   115,000       0
Letters of credit secured using cash collateral       40,600   40,600        
Amount of available borrowings under the secured revolving credit facility       209,400   209,400        
Senior Unsecured Revolving Credit Facility | Senior Notes                    
Debt Instrument [Line Items]                    
Credit facility, maximum borrowing capacity, including letters of credit       365,000   365,000   $ 365,000 $ 300,000  
Letter of Credit                    
Debt Instrument [Line Items]                    
Letters of credit secured using cash collateral       400   400       $ 36,400
Letter of Credit | Senior Notes                    
Debt Instrument [Line Items]                    
Credit facility, maximum borrowing capacity, including letters of credit       $ 100,000   $ 100,000