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, 2018
Jun. 30, 2017
Inventory [Line Items]    
Inventories $ 402,047 $ 149,316
Restricted inventories 97,370 135,343
Restricted and Nonrestricted Inventory, Net 499,417 284,659
Inventory held for sale    
Inventory [Line Items]    
Inventories 71,861 43,787
Repurchase arrangements with customers    
Inventory [Line Items]    
Inventories 72,567 92,496
Consignment arrangements with customers    
Inventory [Line Items]    
Inventories 14,162 7,368
Commemorative coins, held at lower of cost or market    
Inventory [Line Items]    
Inventories 162 40
Borrowed precious metals    
Inventory [Line Items]    
Inventories 243,295 5,625
Product financing arrangements, restricted    
Inventory [Line Items]    
Restricted inventories $ 97,370 $ 135,343