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 ($)
Dec. 31, 2021
Jun. 30, 2021
Derivatives, Fair Value [Line Items]    
Inventories $ 558,344,000 $ 458,019,000
Precious metals held under financing arrangements [1] 88,620,000 154,742,000
Inventory and precious metals held under financing arrangements 646,964,000 612,761,000
Commemorative coin inventory, held at lower of cost or net realizable value (886,000) (406,000)
Premium on metals position (19,209,000) (11,017,000)
Precious metal value not hedged (20,095,000) (11,423,000)
Subtotal 626,869,000 601,338,000
Commitments at market:    
Open inventory purchase commitments 657,483,000 987,926,000
Open inventory sales commitments (469,035,000) (590,156,000)
Margin sale commitments (15,631,000) (7,322,000)
In-transit inventory no longer subject to market risk (9,850,000) (16,707,000)
Unhedgeable premiums on open commitment positions 13,659,000 8,638,000
Borrowed precious metals (67,434,000) (91,866,000)
Product financing arrangements (155,779,000) (201,028,000)
Advances on industrial metals   287,000
Commitments at market (46,587,000) 89,772,000
Precious metal subject to price risk 580,282,000 691,110,000
Precious metal subject to derivative financial instruments:    
Market value of derivative financial instruments 575,639,000 689,592,000
Net precious metals subject to commodity price risk 4,643,000 1,518,000
Precious metals forward contracts at market values    
Precious metal subject to derivative financial instruments:    
Market value of derivative financial instruments 292,146,000 175,352,000
Precious metals futures contracts at market values    
Precious metal subject to derivative financial instruments:    
Market value of derivative financial instruments $ 283,493,000 $ 514,240,000
[1] Includes amounts of the consolidated variable interest entity, which is presented separately in the table below.