Quarterly report pursuant to Section 13 or 15(d)

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

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Financing Agreements - Lines of Credit - Additional Information (Details) - Trading Credit Facility - Line of Credit - USD ($)
3 Months Ended 6 Months Ended
Dec. 21, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
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)   2.40%   2.40%    
Accumulated amortization of loan cost   $ 3,900,000   $ 3,900,000   $ 900,000
Variable rate basis       daily SOFR rate    
Credit facility, interest rate at period end   0.05%   0.05%    
Borrowings due on demand   $ 160,000,000.0   $ 160,000,000.0   185,000,000.0
Borrowings available   109,800,000   109,800,000   $ 65,400,000
Interest expense   $ 2,300,000 $ 2,000,000.0 $ 4,300,000 $ 3,600,000  
Percentage of total expense recognized   42.70% 39.40% 39.50% 38.20%  
Effective rate of interest   3.54% 3.69% 3.55% 3.57%  
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%