Inventories - Summary of Components of Inventory (Details) - USD ($) $ in Thousands |
Mar. 31, 2026 |
Jun. 30, 2025 |
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|---|---|---|---|---|
| Inventory [Line Items] | ||||
| Inventories | $ 1,319,449 | $ 794,812 | ||
| Restricted inventories | 1,447,112 | 484,733 | ||
| Restricted and non-restricted inventory, net | 2,766,561 | 1,279,545 | ||
| Inventory held for Sale | ||||
| Inventory [Line Items] | ||||
| Inventories | 1,002,778 | 558,024 | ||
| Repurchase Arrangements with Customers | ||||
| Inventory [Line Items] | ||||
| Inventories | 128,381 | 116,546 | ||
| Consignment Arrangements with Customers | ||||
| Inventory [Line Items] | ||||
| Inventories | 6,311 | 5,998 | ||
| Collectible Coins, Held at Lower of Cost or Net Realizable Value | ||||
| Inventory [Line Items] | ||||
| Inventories | 102,663 | 68,193 | ||
| Borrowed Precious Metals | ||||
| Inventory [Line Items] | ||||
| Inventories | [1] | 916,696 | 46,051 | |
| Restricted inventories | 837,400 | 0 | ||
| Product Financing Arrangements | ||||
| Inventory [Line Items] | ||||
| Restricted inventories | $ 609,732 | $ 484,733 | ||
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