Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Transactions - Summary of Hedging Activities Shows Precious Metal Commodity Inventory Position Net of Open Sale and Purchase Commitments (Details)

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Derivative Instruments and Hedging Transactions - Summary of Hedging Activities Shows Precious Metal Commodity Inventory Position Net of Open Sale and Purchase Commitments (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Jun. 30, 2019
Derivatives, Fair Value [Line Items]    
Inventories $ 413,129 $ 292,861
Precious metals held under financing arrangements 187,005 208,792
Inventory and precious metals held under financing arrangements 600,134 501,653
Commemorative coin inventory, held at lower of cost or net realizable value (80) (17)
Premium on metals position (6,858) (4,424)
Precious metal value not hedged (6,938) (4,441)
Subtotal 593,196 497,212
Commitments at market:    
Open inventory purchase commitments 672,969 166,600
Open inventory sales commitments (744,820) (158,870)
Margin sale commitments (6,086) (11,652)
In-transit inventory no longer subject to market risk (42,738) (809)
Unhedgeable premiums on open commitment positions 6,677 838
Borrowed precious metals (178,604) (201,144)
Product financing arrangements (122,126) (94,505)
Advances on industrial metals 12,807 8,644
Commitments at market (401,921) (290,898)
Precious metal subject to price risk 191,275 206,314
Precious metal subject to derivative financial instruments:    
Market value of derivative financial instruments 191,535 205,830
Net precious metals subject to commodity price risk (260) 484
Precious metals forward contracts at market values    
Precious metal subject to derivative financial instruments:    
Market value of derivative financial instruments 83,318 133,612
Precious metals futures contracts at market values    
Precious metal subject to derivative financial instruments:    
Market value of derivative financial instruments $ 108,217 $ 72,218