Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Narrative) (Details)

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Summary of Significant Accounting Policies (Narrative) (Details) (USD $)
 3 Months Ended 9 Months Ended
Mar. 31, 2014
Segment
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Feb. 18, 2014
Jun. 30, 2013
Property, Plant and Equipment [Line Items]            
Number of reportable segments 1          
Premium on metals position, marked to market $ (3,435,000)   $ (3,435,000)     $ (1,787,000)
Premium on inventory (5,239,000)   (5,239,000)     (1,787,000)
Commemorative coin inventory, held at lower of cost or market (1,804,000)   (1,804,000)     0
Borrowed metals 8,600,000   8,600,000     20,100,000
Inventories loaned under consignment 7,800,000   7,800,000     2,600,000
Product under financing arrangement 49,700,000   49,700,000     38,600,000
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners         2.50%  
Investments 500,000   500,000   500,000 0
Sales of Inventory to an entity from which Parent purchased non-controlling cost method investment 23,599,000   56,195,000      
Advances, Payables to an entity from which Parent purchased non-controlling cost method investment 1,199,000   1,199,000      
Advertising Expense 300,000 200,000 600,000 500,000    
Shipping, Handling and Transportation Costs 1,200,000 1,000,000 4,200,000 2,700,000    
Payments to Acquire Other Investments     500,000 0    
Futures Commodity And Forwards Contracts And Open Purchase And Sale Commitments [Member]
            
Property, Plant and Equipment [Line Items]            
Gain (loss) on derivative (19,400,000) (3,800,000) (21,200,000) (43,700,000)    
Commodity Contract
            
Property, Plant and Equipment [Line Items]            
Gain (loss) on derivative $ (1,700,000) $ (19,500,000) $ (9,900,000) $ 12,300,000    
Minimum
            
Property, Plant and Equipment [Line Items]            
Property, Plant and Equipment, Estimated Useful Lives     3 years      
Maximum
            
Property, Plant and Equipment [Line Items]            
Property, Plant and Equipment, Estimated Useful Lives     5 years