Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions - Schedule of Sales and Purchases of Related Parties (Details)

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Related Party Transactions - Schedule of Sales and Purchases of Related Parties (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Related Party Transaction [Line Items]        
Sales $ 614,725 $ 359,026 $ 1,530,510 $ 735,060
Purchases 16,560 22,569 65,536 65,716
Stack's Bowers Galleries        
Related Party Transaction [Line Items]        
Sales 17,127 26,169 53,958 44,934
Purchases 11,731 15,151 48,066 36,317
Equity method investee        
Related Party Transaction [Line Items]        
Sales 591,740 331,405 1,463,857 684,955
Purchases 4,829 7,325 12,701 28,651
SilverTowne L.P.        
Related Party Transaction [Line Items]        
Sales $ 5,858 1,452 12,695 5,171
Purchases   $ 93 $ 4,769 $ 748