Annual report pursuant to Section 13 and 15(d)

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

v3.21.2
Financing Agreements - Lines of Credit - Additional Information (Details) - Line of Credit - USD ($)
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jul. 16, 2021
Trading Credit Facility      
Debt Instrument [Line Items]      
Interest expense $ 5,900,000 $ 7,000,000.0  
Percentage of total expense recognized 29.50% 37.10%  
Effective rate of interest 3.63% 4.01%  
Revolving Credit Facility | LIBOR      
Debt Instrument [Line Items]      
Variable rate 2.50%    
A-Mark | Trading Credit Facility      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity $ 270,000,000.0    
Line of credit, current borrowing capacity 220,000,000.0    
Line of credit, accordion option 50,000,000.0    
Accumulated amortization of loan cost $ 900,000 $ 500,000  
Variable rate basis one-month LIBOR    
Credit facility, interest rate at period end 0.10% 0.16%  
Borrowings due on demand $ 185,000,000.0 $ 135,000,000.0  
Borrowings available $ 65,400,000 $ 76,300,000  
A-Mark | Trading Credit Facility | Subsequent Event      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity     $ 330,000,000
Line of credit, current borrowing capacity     280,000,000.0
Line of credit, accordion option     $ 50,000,000