Quarterly report pursuant to Section 13 or 15(d)

Inventories (Summary of Inventories) (Details)

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Inventories (Summary of Inventories) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Jun. 30, 2016
Inventory [Line Items]    
Inventories $ 189,081 $ 185,699
Product financing arrangement, restricted 156,450 59,358
Restricted and Nonrestricted Inventory, Net 345,531 245,057
Inventory held for sale    
Inventory [Line Items]    
Inventories 49,715 81,006
Repurchase arrangements with customers    
Inventory [Line Items]    
Inventories 126,057 92,283
Consignment arrangements with customers    
Inventory [Line Items]    
Inventories 6,831 8,042
Commemorative coins, held at lower of cost or market    
Inventory [Line Items]    
Inventories 41 16
Borrowed precious metals from suppliers    
Inventory [Line Items]    
Inventories 6,437 4,352
Product financing arrangement, restricted    
Inventory [Line Items]    
Product financing arrangement, restricted $ 156,450 $ 59,358