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
Dec. 31, 2017
Jun. 30, 2017
Inventory [Line Items]    
Inventories $ 215,074 $ 149,316
Restricted inventories 120,161 135,343
Restricted and Nonrestricted Inventory, Net 335,235 284,659
Inventory held for sale    
Inventory [Line Items]    
Inventories 73,959 43,787
Repurchase arrangements with customers    
Inventory [Line Items]    
Inventories 106,434 92,496
Consignment arrangements with customers    
Inventory [Line Items]    
Inventories 15,026 7,368
Commemorative coins, held at lower of cost or market    
Inventory [Line Items]    
Inventories 129 40
Borrowed precious metals    
Inventory [Line Items]    
Inventories 19,526 5,625
Product financing arrangements, restricted    
Inventory [Line Items]    
Restricted inventories $ 120,161 $ 135,343