Secured Loans Receivable - Schedule of Financing Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Jun. 30, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Secured loans (current)	$ 120,351	$ 94,037
Bullion and Numismatic and Semi-numismatic and Graded Sports Memorabilia
Accounts, Notes, Loans and Financing Receivable [Line Items]
Secured loans (current)	$ 120,351	$ 94,037
Secured loans (current), percentage	100.00%	100.00%
Loan-to-value of 75% or More | Bullion and Numismatic and Semi-numismatic and Graded Sports Memorabilia
Accounts, Notes, Loans and Financing Receivable [Line Items]
Secured loans (current)	$ 8,161	$ 11,101
Secured loans (current), percentage	6.80%	11.80%
Loan-to-value of Less than 75% | Bullion and Numismatic and Semi-numismatic and Graded Sports Memorabilia
Accounts, Notes, Loans and Financing Receivable [Line Items]
Secured loans (current)	$ 112,190	$ 82,936
Secured loans (current), percentage	93.20%	88.20%