Annual report pursuant to Section 13 and 15(d)

Financing Agreements - Lines of Credit - Trading Credit Facility - Additional Information (Details)

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Financing Agreements - Lines of Credit - Trading Credit Facility - Additional Information (Details) - Trading Credit Facility - Line of Credit - USD ($)
12 Months Ended
Dec. 21, 2021
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Debt Instrument [Line Items]        
Line of credit facility term 3 years      
Line of credit, termination date Dec. 21, 2024      
Stated interest rate (in percentage)   7.50%    
Accumulated amortization of loan cost   $ 2,400,000 $ 3,400,000  
Variable rate basis   daily SOFR rate    
Credit facility, interest rate at period end   5.10%    
Borrowings due on demand   $ 235,000,000.0 215,000,000.0  
Borrowings available   115,000,000.0 122,000,000.0  
Interest expense   $ 15,900,000 $ 8,500,000 $ 5,900,000
Percentage of total expense recognized   50.30% 38.60% 29.50%
Effective rate of interest   7.15% 4.47% 3.63%
Maximum        
Debt Instrument [Line Items]        
Line of credit, current borrowing capacity $ 350,000,000.0      
Minimum        
Debt Instrument [Line Items]        
Lender holding percentage of revolving commitments   66.67%    
SOFR        
Debt Instrument [Line Items]        
Applicable margin of basis points 2.36%