Quarterly report pursuant to Section 13 or 15(d)

Inventories (Narrative) (Details)

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Inventories (Narrative) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2017
Inventory [Line Items]      
Inventory held for sale $ 215,074   $ 149,316
Repurchase arrangements with customers 106,400   92,500
Consignment arrangements with customers 15,000   7,400
Commemorative coins, held at lower of cost or market 129   40
Borrowed precious metals from suppliers 19,500   5,600
Product financing arrangement, restricted 120,200   135,300
Unrealized gains (losses) included in inventory balance 5,600 $ (4,500)  
Premium on metals position 4,365   4,088
Inventory held for sale      
Inventory [Line Items]      
Inventory held for sale $ 73,959   $ 43,787