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, 2018
Jun. 30, 2017
Inventory [Line Items]    
Inventory held for sale $ 166,176 $ 149,316
Precious metals inventory subject to repurchase arrangements 104,900 92,500
Consignment arrangements with customers 10,800 7,400
Commemorative coins, held at lower of cost or market 99 40
Borrowed precious metals from suppliers 17,800 5,600
Product financing arrangement, restricted 113,900 135,300
Unrealized gains (losses) included in inventory balance (5,400) (4,500)
Premium on metals position 3,530 4,088
Inventory held for sale    
Inventory [Line Items]    
Inventory held for sale $ 32,605 $ 43,787