Annual report pursuant to Section 13 and 15(d)

Inventories (narrative) (Details)

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Inventories (narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Inventory [Line Items]    
Inventory held for sale $ 152,076 $ 150,944
Repurchase arrangements with customers 49,100 27,700
Consignment arrangements with customers 5,600 11,100
Commemorative coins, held at lower of cost or market 1,518 2,564
Borrowed precious metals from suppliers 9,500 8,700
Product financing arrangements, restricted 39,400 24,600
Premium on metals position 3,255 3,285
Unrealized gains (losses) included in inventory balance (3,900) 3,800
Inventory held for sale    
Inventory [Line Items]    
Inventory held for sale $ 86,353 $ 100,877