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
Sep. 30, 2024
Jun. 30, 2024
Derivatives, Fair Value [Line Items]    
Inventories $ 1,277,299 $ 1,097,144
Precious metals held under financing arrangements 27,354 22,066
Inventory and precious metals held under financing arrangements 1,304,653 1,119,210
Commemorative coin inventory, held at lower of cost or net realizable value (3,103) (3,236)
Premium on metals position (36,727) (34,175)
Precious metal value not hedged (39,830) (37,411)
Commitments at market:    
Open inventory purchase commitments 751,031 817,900
Open inventory sales commitments (410,010) (388,184)
Margin sales commitments (32,055) (22,316)
In-transit inventory no longer subject to market risk (14,423) (21,715)
Unhedgeable premiums on open commitment positions 13,744 10,986
Borrowed precious metals (39,487) (31,993)
Product financing arrangements (541,744) (517,744)
Advances on industrial metals 209 394
Commitments at market (272,735) (152,672)
Precious metal subject to price risk 992,088 929,127
Precious metal subject to derivative financial instruments:    
Market value of derivative financial instruments 992,949 926,653
Net precious metals subject to commodity price risk (861) 2,474
Precious metals forward contracts at market values    
Precious metal subject to derivative financial instruments:    
Market value of derivative financial instruments 803,667 843,439
Precious metals futures contracts at market values    
Precious metal subject to derivative financial instruments:    
Market value of derivative financial instruments $ 189,282 $ 83,214