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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, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Mar. 31, 2026
Mar. 30, 2026
Sep. 30, 2025
Debt Instrument [Line Items]                    
Total outstanding borrowings of unconsolidated entities       $ 1,409,132   $ 1,409,132       $ 1,029,114
Loss on extinguishment of debt, net       668 $ 0 668 $ 0      
Debt repurchased         $ 0   $ 0      
Senior Notes                    
Debt Instrument [Line Items]                    
Total outstanding borrowings of unconsolidated entities       989,112   989,112       950,644
Senior Notes | 8.000%                    
Debt Instrument [Line Items]                    
Total outstanding borrowings of unconsolidated entities       400,000   400,000       0
Extinguishment of debt       357,300            
Loss on extinguishment of debt, net       700            
Junior Subordinated Notes                    
Debt Instrument [Line Items]                    
Total outstanding borrowings of unconsolidated entities       80,020   80,020       78,470
Unamortized accretion       $ 20,753   $ 20,753       22,303
Junior Subordinated Notes                    
Debt Instrument [Line Items]                    
Weighted average fixed interest rate of debt       6.38%   6.38%        
Aggregate principle balance of notes       $ 100,800   $ 100,800        
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        
Junior Subordinated Debt, Original Terms | Secured Overnight Financing Rate (SOFR)                    
Debt Instrument [Line Items]                    
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               $ 625,000    
Credit facility, available increase in borrowing capacity               100,000    
Senior unsecured revolving credit facility       340,000   340,000       $ 0
Letters of credit secured using cash collateral       45,800   45,800        
Amount of available borrowings under the secured revolving credit facility       $ 139,200   $ 139,200        
Weighted average fixed interest rate of debt       6.97%   6.97%        
Senior Unsecured Revolving Credit Facility | Minimum                    
Debt Instrument [Line Items]                    
Percent of commitment fee on unused portion           0.25%        
Senior Unsecured Revolving Credit Facility | Minimum | Secured Overnight Financing Rate (SOFR)                    
Debt Instrument [Line Items]                    
Basis spread on variable rate           2.15%        
Senior Unsecured Revolving Credit Facility | Minimum | Alternate Base Rate                    
Debt Instrument [Line Items]                    
Basis spread on variable rate           1.15%        
Senior Unsecured Revolving Credit Facility | Maximum                    
Debt Instrument [Line Items]                    
Percent of commitment fee on unused portion           0.40%        
Senior Unsecured Revolving Credit Facility | Maximum | Secured Overnight Financing Rate (SOFR)                    
Debt Instrument [Line Items]                    
Basis spread on variable rate           2.90%        
Senior Unsecured Revolving Credit Facility | Maximum | Alternate Base Rate                    
Debt Instrument [Line Items]                    
Basis spread on variable rate           1.90%        
Senior Unsecured Revolving Credit Facility | Senior Notes                    
Debt Instrument [Line Items]                    
Credit facility, maximum borrowing capacity, including letters of credit               525,000 $ 365,000  
Letter of Credit | Senior Notes                    
Debt Instrument [Line Items]                    
Credit facility, maximum borrowing capacity, including letters of credit               $ 100,000