Assets and Liabilities, at Fair Value - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Jun. 30, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	$ 947,661	$ 134,515
Liabilities on borrowed metals	85,606	46,051
Derivative liabilities	338,223	96,177
Fair Value on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Inventories	1,459,653	1,211,352
Total assets, valued at fair value	2,407,314	1,345,867
Liabilities on borrowed metals	85,606	46,051
Product financing arrangements	504,593	484,733
Acquisition-related contingent consideration	2,109	7,890
Stock payable liability	1,140	1,484
Total liabilities, valued at fair value	931,671	636,335
Fair Value on a Recurring Basis | Open sale and purchase commitments, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	935,465	129,784
Fair Value on a Recurring Basis | Futures contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	89	4,326
Fair Value on a Recurring Basis | Forward contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	12,107	405
Fair Value on a Recurring Basis | Open sale and purchase commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	64,872	15,495
Fair Value on a Recurring Basis | Liability on margin accounts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	14,346	4,169
Fair Value on a Recurring Basis | Futures contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	122,225	109
Fair Value on a Recurring Basis | Forward contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	136,780	76,404
Fair Value on a Recurring Basis | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Inventories	1,459,653	1,211,352
Total assets, valued at fair value	2,407,314	1,345,867
Liabilities on borrowed metals	85,606	46,051
Product financing arrangements	504,593	484,733
Acquisition-related contingent consideration	0	0
Stock payable liability	1,140	1,484
Total liabilities, valued at fair value	929,562	628,445
Fair Value on a Recurring Basis | Level 1 | Open sale and purchase commitments, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	935,465	129,784
Fair Value on a Recurring Basis | Level 1 | Futures contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	89	4,326
Fair Value on a Recurring Basis | Level 1 | Forward contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	12,107	405
Fair Value on a Recurring Basis | Level 1 | Open sale and purchase commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	64,872	15,495
Fair Value on a Recurring Basis | Level 1 | Liability on margin accounts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	14,346	4,169
Fair Value on a Recurring Basis | Level 1 | Futures contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	122,225	109
Fair Value on a Recurring Basis | Level 1 | Forward contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	136,780	76,404
Fair Value on a Recurring Basis | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Inventories	0	0
Total assets, valued at fair value	0	0
Liabilities on borrowed metals	0	0
Product financing arrangements	0	0
Acquisition-related contingent consideration	0	0
Stock payable liability	0	0
Total liabilities, valued at fair value	0	0
Fair Value on a Recurring Basis | Level 2 | Open sale and purchase commitments, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Fair Value on a Recurring Basis | Level 2 | Futures contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Fair Value on a Recurring Basis | Level 2 | Forward contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Fair Value on a Recurring Basis | Level 2 | Open sale and purchase commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	0	0
Fair Value on a Recurring Basis | Level 2 | Liability on margin accounts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	0	0
Fair Value on a Recurring Basis | Level 2 | Futures contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	0	0
Fair Value on a Recurring Basis | Level 2 | Forward contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	0	0
Fair Value on a Recurring Basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Inventories	0	0
Total assets, valued at fair value	0	0
Liabilities on borrowed metals	0	0
Product financing arrangements	0	0
Acquisition-related contingent consideration	2,109	7,890
Stock payable liability	0	0
Total liabilities, valued at fair value	2,109	7,890
Fair Value on a Recurring Basis | Level 3 | Open sale and purchase commitments, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Fair Value on a Recurring Basis | Level 3 | Futures contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Fair Value on a Recurring Basis | Level 3 | Forward contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Fair Value on a Recurring Basis | Level 3 | Open sale and purchase commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	0	0
Fair Value on a Recurring Basis | Level 3 | Liability on margin accounts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	0	0
Fair Value on a Recurring Basis | Level 3 | Futures contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	0	0
Fair Value on a Recurring Basis | Level 3 | Forward contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	$ 0	$ 0