Quarterly report pursuant to Section 13 or 15(d)

Inventories (Narrative) (Details)

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Inventories (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Inventory [Line Items]    
Inventory held for sale [1] $ 213,068 $ 198,356
Precious metals inventory subject to repurchase arrangements 68,900 65,500
Consignment arrangements with customers 5,000 4,900
Commemorative coin inventory, held at lower of cost or net realizable value 2,336 17
Borrowed precious metals from suppliers 24,300 21,800
Product financing arrangement, restricted 159,100 94,500
Unrealized gains (losses) included in inventory balance (1,500) 8,800
Premium on metals position 5,276 4,424
Inventory held for sale    
Inventory [Line Items]    
Inventory held for sale $ 112,604 $ 106,165
[1] Includes amounts of the consolidated variable interest entity, which is presented separately in the table below.