Quarterly report pursuant to Section 13 or 15(d)

Inventories (narrative) (Details)

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Inventories (narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Inventory [Line Items]    
Inventory held for sale $ 204,476 $ 152,076
Repurchase arrangements with customers 75,900 49,100
Consignment arrangements with customers 5,600 5,600
Commemorative coins, held at lower of cost or market 163 1,518
Borrowed precious metals from suppliers 4,000 9,500
Product financing arrangements, restricted 50,000 39,400
Premium on metals position 3,529 3,255
Unrealized gains (losses) included in inventory balance (5,200) (3,900)
Inventory held for sale    
Inventory [Line Items]    
Inventory held for sale $ 118,796 $ 86,353