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, 2019
Jun. 30, 2018
Inventory [Line Items]    
Inventories [1] $ 200,696 $ 166,176
Restricted inventories 65,723 113,940
Restricted and nonrestricted inventory, net 266,419 280,116
Inventory held for sale    
Inventory [Line Items]    
Inventories 89,106 32,605
Repurchase arrangements with customers    
Inventory [Line Items]    
Inventories 89,687 104,907
Consignment arrangements with customers    
Inventory [Line Items]    
Inventories 4,375 10,785
Commemorative coins, held at lower of cost or market    
Inventory [Line Items]    
Inventories 33 99
Borrowed precious metals    
Inventory [Line Items]    
Inventories 17,495 17,780
Product financing arrangements, restricted    
Inventory [Line Items]    
Restricted inventories $ 65,723 $ 113,940
[1] Includes amounts of the consolidated variable interest entity, which is presented separately in the table below.