Annual report pursuant to Section 13 and 15(d)

Financing Agreements (Narrative) (Details)

v3.2.0.727
Financing Agreements (Narrative) (Details)
 12 Months Ended
Sep. 12, 2014
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Sep. 23, 2015
USD ($)
Sep. 11, 2015
USD ($)
Sep. 10, 2015
USD ($)
institutional_participant
Jul. 10, 2015
USD ($)
Jul. 09, 2015
USD ($)
Jul. 08, 2015
USD ($)
institutional_participant
Oct. 09, 2014
USD ($)
Schedule Of Financing Arrangements [Line Items]                    
Line of credit, maximum borrowing capacity   $ 0               $ 16,000,000.0
Percentage of total expense recognized   83.20% 84.40%              
Effective rate of interest   2.82% 3.12%              
Liability on borrowed metals   $ 9,500,000 $ 8,709,000              
Product financing obligation   39,425,000 24,610,000              
Collectibles credit facility | Certain lender common to SNI and A-Mark | SNI | Line of credit                    
Schedule Of Financing Arrangements [Line Items]                    
Credit facility, remaining borrowing capacity   0 3,300,000              
Trading credit facility | Line of credit                    
Schedule Of Financing Arrangements [Line Items]                    
Interest expense, notes payable   3,600,000 $ 3,300,000              
Trading credit facility | A-Mark | Line of credit                    
Schedule Of Financing Arrangements [Line Items]                    
Line of credit, maximum borrowing capacity   $ 230,000,000                
Variable rate basis   one-month LIBOR                
Credit facility, interest rate at period end   0.19% 0.15%              
Borrowings due on demand   $ 147,000,000 $ 135,200,000              
Credit facility, remaining borrowing capacity   $ 20,900,000 $ 14,400,000              
Credit facility, minimum required tangible net worth $ 35,000,000                  
Subsequent Event | Trading credit facility                    
Schedule Of Financing Arrangements [Line Items]                    
Line of credit, maximum borrowing capacity         $ 40,000,000.0 $ 35,000,000.0        
Line of credit | Subsequent Event | Trading credit facility                    
Schedule Of Financing Arrangements [Line Items]                    
Line of credit, maximum borrowing capacity       $ 205,000,000.0 $ 40,000,000.0 $ 35,000,000.0 $ 45,000,000.0 $ 35,000,000.0    
Number of institutional participants | institutional_participant           5     6  
Number of institutional participants requested to terminate credit demand line | institutional_participant                 1  
Line of credit, terminated                 $ 40,000,000.0  
Number of institutional participants increased credit demand line | institutional_participant           1