Inventories - Summary of Components of Inventory (Details) - USD ($) $ in Thousands |
Jun. 30, 2025 |
Jun. 30, 2024 |
|---|---|---|
| Inventory [Line Items] | ||
| Inventories | $ 794,812 | $ 579,400 |
| Restricted inventories | 484,733 | 517,744 |
| Restricted and non-restricted inventory, net | 1,279,545 | 1,097,144 |
| Inventory held for Sale | ||
| Inventory [Line Items] | ||
| Inventories | 558,024 | 342,196 |
| Repurchase Arrangements with Customers | ||
| Inventory [Line Items] | ||
| Inventories | 116,546 | 199,559 |
| Consignment Arrangements with Customers | ||
| Inventory [Line Items] | ||
| Inventories | 5,998 | 2,416 |
| Collectible Coins, Held at Lower of Cost or Net Realizable Value | ||
| Inventory [Line Items] | ||
| Inventories | 68,193 | 3,236 |
| Borrowed Precious Metals | ||
| Inventory [Line Items] | ||
| Inventories | 46,051 | 31,993 |
| Product Financing Arrangements | ||
| Inventory [Line Items] | ||
| Restricted inventories | $ 484,733 | $ 517,744 |