Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Narrative) (Details)

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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jul. 01, 2019
Property, Plant and Equipment [Line Items]      
Restricted cash $ 300 $ 400  
Number of days notice to terminate contract 14 days    
Precious metals held under financing arrangements $ 208,792 262,566  
Revenue percentage from other sources (less than) 1.00%    
Advertising expense $ (2,461) (3,234)  
Shipping, handling costs $ (4,751,199) (7,576,805)  
Forecast | Accounting Standards Update 2016-02      
Property, Plant and Equipment [Line Items]      
Right-of-use asset     $ 5,300
Lease liability     $ 6,300
Right-of-use asset, percentage of total assets     1.00%
Lease liability, percentage of total assets     1.00%
Minimum      
Property, Plant and Equipment [Line Items]      
Estimated useful lives of related assets 3 years    
Estimated useful lives of intangibles 3 years    
Maximum      
Property, Plant and Equipment [Line Items]      
Estimated useful lives of related assets 25 years    
Estimated useful lives of intangibles 15 years    
Shipping and Handling      
Property, Plant and Equipment [Line Items]      
Shipping, handling costs $ (6,498) (4,643)  
Contingent Consideration Liability      
Property, Plant and Equipment [Line Items]      
Contingent liability $ 0 $ 588