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ACQUISITIONS - NARRATIVE (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 02, 2021
Dec. 31, 2021
Mar. 31, 2022
Mar. 31, 2022
Jun. 30, 2021
Business Acquisition [Line Items]          
Goodwill     $ 95,674,000 $ 95,674,000 $ 71,222,000
E*TRADE Advisor Services          
Business Acquisition [Line Items]          
Cash consideration $ 54,600,000 $ 54,800,000      
Acquisition-related costs     0 40,000.00  
Tangible assets acquired 6,500,000   6,400,000 6,400,000  
Liabilities assumed 3,400,000   $ 3,100,000 $ 3,100,000  
Intangible assets acquired 27,060,000        
Goodwill $ 24,400,000        
True-up payment based on working capital adjustment   $ 200,000