Annual report pursuant to Section 13 and 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
Jun. 30, 2015
Jun. 30, 2014
Derivatives, Fair Value [Line Items]    
Inventory $ 191,501 $ 175,554
Commemorative coin inventory, held at lower of cost or market (1,518) (2,564)
Premium on metals position (3,255) (3,285)
Inventory value not hedged (4,773) (5,849)
Subtotal 186,728 169,705
Commitments at market    
Open inventory purchase commitments 444,023 489,944
Open inventory sales commitments (249,081) (190,108)
Margin sale commitments (12,430) (15,751)
In-transit inventory no longer subject to market risk (13,807) (4,522)
Unhedgable premiums on open commitment positions 528 1,694
Inventory borrowed from suppliers (9,500) (8,709)
Product financing obligation (39,425) (24,610)
Advances on industrial metals 3,340 8,813
Inventory subject to price risk 310,376 426,456
Inventory subject to derivative financial instruments    
Market value of derivative financial instruments 310,316 427,039
Net inventory subject to commodity price risk 60 (583)
Precious metals forward contracts at market values    
Inventory subject to derivative financial instruments    
Market value of derivative financial instruments 202,323 206,055
Precious metals futures contracts at market values    
Inventory subject to derivative financial instruments    
Market value of derivative financial instruments $ 107,993 $ 220,984