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, 2016
Jun. 30, 2016
Inventory [Line Items]    
Inventory held for sale $ 179,826 $ 185,699
Repurchase arrangements with customers 101,900 92,300
Consignment arrangements with customers 11,700 8,000
Commemorative coins, held at lower of cost or market (7) (16)
Borrowed precious metals from suppliers 4,200 4,400
Product financing arrangement, restricted 117,800 59,400
Unrealized gains (losses) included in inventory balance 1,000 12,700
Premium on metals position 3,368 4,627
Inventory held for sale    
Inventory [Line Items]    
Inventory held for sale $ 62,000 $ 81,006