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, 2018
Jun. 30, 2017
Inventory [Line Items]    
Inventory held for sale $ 402,047 $ 149,316
Repurchase arrangements with customers 72,600 92,500
Consignment arrangements with customers 14,200 7,400
Commemorative coins, held at lower of cost or market 162 40
Borrowed precious metals from suppliers 243,300 5,600
Product financing arrangement, restricted 97,400 135,300
Unrealized gains (losses) included in inventory balance (3,700) (4,500)
Premium on metals position 3,375 4,088
Inventory held for sale    
Inventory [Line Items]    
Inventory held for sale $ 71,861 $ 43,787