Quarterly report pursuant to Section 13 or 15(d)

Hedging Transactions (Hedging of Precious Metals Inventory) (Details)

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Hedging Transactions (Hedging of Precious Metals Inventory) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Jun. 30, 2013
Derivatives, Fair Value [Line Items]    
Inventory $ 193,801 $ 162,378
Commemorative coin inventory, held at lower of cost or market (1,804) 0
Premium on metals position (3,435) (1,787)
Premium on inventory (5,239) (1,787)
Subtotal 188,562 160,591
Commitments at market    
Open inventory purchase commitments 473,095 461,883
Open inventory sales commitments (253,818) (272,044)
Margin sale commitments (13,525) (13,651)
In-transit inventory no longer subject to market risk (5,768) (24,221)
Unhedgable premiums on open commitment positions 1,555 2,107
Inventory borrowed from suppliers (8,620) (20,117)
Product financing obligation (49,684) (38,554)
Advances on industrial metals (5,678) 33
Inventory subject to price risk 326,119 256,027
Inventory subject to derivative financial instruments    
Market value of inventory subject to derivative financial instruments 326,494 256,271
Net inventory subject to price risk 375 244
Precious metals forward contracts at market values
    
Inventory subject to derivative financial instruments    
Market value of inventory subject to derivative financial instruments 149,401 84,999
Precious metals futures contracts at market values
    
Inventory subject to derivative financial instruments    
Market value of inventory subject to derivative financial instruments $ 177,093 $ 171,272