Annual report pursuant to Section 13 and 15(d)

Description of Business - Additional Information (Details)

v3.24.2.u1
Description of Business - Additional Information (Details)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jun. 21, 2024
USD ($)
Feb. 26, 2024
USD ($)
shares
Jun. 30, 2024
USD ($)
Jun. 30, 2022
Jun. 30, 2024
USD ($)
Jun. 30, 2024
USD ($)
Coin
Product
Reportable_segments
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Feb. 29, 2024
Jun. 27, 2022
Mar. 31, 2021
USD ($)
Aug. 31, 2017
USD ($)
Description Of Business [Line Items]                        
Number of reportable segments | Reportable_segments           3            
Number of coins and bar products | Coin           2,100            
Remeasurement gain on pre-existing equity interest           $ 16,669 $ 0 $ 0        
Derecognition of accumulated other comprehensive income related to the currency translation adjustment           1,086 (1,025)          
Goodwill     $ 199,937   $ 199,937 199,937 $ 100,943          
Lock-up period   270 days                    
LPM Group Limited                        
Description Of Business [Line Items]                        
Business acquisition, percentage of interests acquired   100.00%                    
Cash consideration   $ 37,506                    
Business acquisition, upfront consideration   41,400                    
Business acquisition, consideration in cash   37,500                    
Business acquisition, consideration in fair value   3,500                    
Settlement of pre-existing payables due to A-Mark   398                    
Business acquisition, transaction costs   2,800                    
Contingent Consideration (EBITDA)   37,500                    
Business acquisition, contingent consideration fair value   2,800 $ 2,400   2,400 $ 2,400            
Goodwill   $ 21,034                    
Increase in goodwill         1,000              
Change in working capital balances         $ 1,000              
LPM Group Limited | Customer Relationships                        
Description Of Business [Line Items]                        
Customer relationship weighted-average useful life   7 years 2 months 12 days                    
LPM Group Limited | Common Stock                        
Description Of Business [Line Items]                        
Business acquisition, consideration in shares | shares   139,455                    
Silver Gold Bull, Inc.                        
Description Of Business [Line Items]                        
Business acquisition, percentage of interests acquired     8.00%   8.00% 8.00%       40.00%    
Cash consideration $ 9,600                      
Settlement of pre-existing payables due to A-Mark 9,418                      
Business acquisition, transaction costs $ 200                      
Business acquisition, option to purchase additional percentage of the outstanding equity 8.00%     27.60%       27.60%   27.60%    
Remeasurement gain on pre-existing equity interest $ 16,700                      
Derecognition of accumulated other comprehensive income related to the currency translation adjustment 1,300                      
Goodwill $ 77,960   $ 78,000   $ 78,000 $ 78,000            
Dividends declared     15,900                  
Ownership interest percentage after transaction 55.40%     47.40%                
Adjustments to fair value options     3,000                  
Fair value of option to purchase before modification and partial exercise     2,300                  
Pre-existing ownership interest $ 56,848                      
Percentage of fair value of pre-existing ownership interest 47.40%                      
Fair value of noncontrolling ownership interest $ 50,652                      
Silver Gold Bull, Inc. | Customer Relationships                        
Description Of Business [Line Items]                        
Customer relationship weighted-average useful life 4 years                      
Silver Gold Bull, Inc. | SGB Shareholders                        
Description Of Business [Line Items]                        
Dividends receivable     7,500   7,500 7,500            
Silver Gold Bull, Inc. | Other Shareholders                        
Description Of Business [Line Items]                        
Dividend payable     $ 8,400   $ 8,400 $ 8,400            
JMB                        
Description Of Business [Line Items]                        
Number of products | Product           6,200            
Goodwill                     $ 92,100  
Goldline, LLC                        
Description Of Business [Line Items]                        
Goodwill                       $ 1,400
Maximum | Silver Gold Bull, Inc.                        
Description Of Business [Line Items]                        
Business acquisition, percentage of interests acquired     70.00% 75.00% 70.00% 70.00%   75.00%   75.00%    
Precious Metals Purchasing Partners, LLC | Silver Gold Bull, Inc.                        
Description Of Business [Line Items]                        
Percentage of ownership percentage           50.00%            
Precious Metals Purchasing Partners, LLC | Goldline, LLC                        
Description Of Business [Line Items]                        
Percentage of ownership percentage           50.00%            
Collectible Card Partners, LLC                        
Description Of Business [Line Items]                        
Percentage of ownership percentage           50.00%            
Aquila Holding LLC                        
Description Of Business [Line Items]                        
Percentage of Purchase Interest                 5.00%      
Aquila Holding LLC | AM/LPM Ventures, LLC                        
Description Of Business [Line Items]                        
Percentage of Purchase Interest   5.00%                    
Consideration received on equity interest purchased   $ 2,100