Annual report pursuant to Section 13 and 15(d)

Derivative Instruments and Hedging Transactions (Hedging of Precious Metals Inventory) (Details)

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Derivative Instruments and Hedging Transactions (Hedging of Precious Metals Inventory) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jun. 30, 2018
Derivatives, Fair Value [Line Items]    
Inventory $ 292,861 $ 280,116
Precious metals held under financing arrangements 208,792 262,566
Inventory and precious metals held under financing arrangements 501,653 542,682
Commemorative coin inventory, held at lower of cost or net realizable value (17) (99)
Premium on metals position (4,424) (3,530)
Precious metal value not hedged (4,441) (3,629)
Subtotal 497,212 539,053
Commitments at market:    
Open inventory purchase commitments 166,600 342,287
Open inventory sales commitments (158,870) (138,022)
Margin sale commitments (11,652) (5,988)
In-transit inventory no longer subject to market risk (809) (1,060)
Unhedgeable premiums on open commitment positions 838 541
Borrowed precious metals (201,144) (280,346)
Product financing arrangements (94,505) (113,940)
Advances on industrial metals 8,644 6,044
Commitments at market (290,898) (190,484)
Precious metal subject to price risk 206,314 348,569
Precious metal subject to derivative financial instruments:    
Market value of derivative financial instruments 205,830 347,415
Net precious metals subject to commodity price risk 484 1,154
Precious metals forward contracts at market values    
Precious metal subject to derivative financial instruments:    
Market value of derivative financial instruments 133,612 274,994
Precious metals futures contracts at market values    
Precious metal subject to derivative financial instruments:    
Market value of derivative financial instruments $ 72,218 $ 72,421