Quarterly report pursuant to Section 13 or 15(d)

Inventories (narrative) (Details)

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Inventories (narrative) (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Mar. 31, 2016
Jun. 30, 2015
Inventory [Line Items]    
Inventory held for sale $ 180,805 $ 152,076
Repurchase arrangements with customers 76,200 49,100
Consignment arrangements with customers 6,300 5,600
Commemorative coins, held at lower of cost or market (6) (1,518)
Borrowed precious metals from suppliers 5,600 9,500
Product financing arrangement, restricted 93,200 39,400
Premium on metals position 5,463 3,255
Unrealized gains (losses) included in inventory balance 2,100 (3,900)
Inventory held for sale    
Inventory [Line Items]    
Inventory held for sale $ 92,698 $ 86,353