Inventories - Summary of Components of Inventory (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Jun. 30, 2025
Inventory [Line Items]
Inventories	$ 1,031,156	$ 794,812
Restricted inventories	504,593	484,733
Restricted and non-restricted inventory, net	1,535,749	1,279,545
Inventory held for Sale
Inventory [Line Items]
Inventories	770,526	558,024
Repurchase Arrangements with Customers
Inventory [Line Items]
Inventories	94,699	116,546
Consignment Arrangements with Customers
Inventory [Line Items]
Inventories	4,229	5,998
Collectible Coins, Held at Lower of Cost or Net Realizable Value
Inventory [Line Items]
Inventories	76,096	68,193
Borrowed Precious Metals
Inventory [Line Items]
Inventories	85,606	46,051
Product Financing Arrangements
Inventory [Line Items]
Restricted inventories	$ 504,593	$ 484,733