v3.25.2
Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Summary Of Significant Accounting Policies [Line Items]      
Notice period to terminate contract 14 days    
Precious metals held under financing arrangements $ 0 $ 22,066,000  
Indefinite-lived intangible assets impairment charges $ 0    
Metals purchase by customer maximum specified time period 1 year    
Metal delivers to customer after receiving customers deposit based on prevailing current spot price percentage 110.00%    
Unpriced metal is subject to margin call If deposit falls below percentage of value of unpriced metal 105.00%    
Percentage to remit partial payment of total order price 20.00%    
Amortization of debt issuance costs $ 4,092,000 2,447,000 $ 2,113,000
Advertising costs 23,698,000 15,253,000 15,877,000
Cost of sales $ 10,767,698,000 $ 9,525,784,000 $ 8,991,892,000
Common stock, shares outstanding 24,639,386 22,953,391 23,336,387
Revenue From Contracts With Customers Percentage of Service Revenue 2.00%    
Revenue from contracts with customers amount of service revenue $ 176,900,000    
Percentage of numismatic products revenue 98.00%    
Percentage of hammer price on auction transaction price 20.00%    
Contract liabilities $ 6,900,000 $ 0  
Antidilutive shares were excluded from the calculation 279,000 23,000 29,000
SGI      
Summary Of Significant Accounting Policies [Line Items]      
Precious metals held under financing arrangements $ 0    
ASU 2016-13      
Summary Of Significant Accounting Policies [Line Items]      
Change in accounting principle, accounting standards update, adoption date Jul. 01, 2022    
ASU 2023-07      
Summary Of Significant Accounting Policies [Line Items]      
Change in accounting principle, accounting standards update, adoption date Jun. 30, 2025    
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] true    
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] true    
Shipping and Handling      
Summary Of Significant Accounting Policies [Line Items]      
Cost of sales $ 26,500,000 $ 21,900,000 $ 28,400,000
Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Estimated useful lives of related assets 3 years    
Estimated useful lives of intangibles 1 year    
Threshold percentage for equity method investment 20.00%    
Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Estimated useful lives of related assets 39 years    
Estimated useful lives of intangibles 15 years    
Threshold percentage for equity method investment 50.00%    
Customer locks period for purchase price 2 years