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GOODWILL AND OTHER INTANGIBLE ASSETS - Goodwill by Business Segments (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2023
Goodwill    
April 1, 2022   $ 1,070,442
Changes   17,342
March 31, 2022 $ 1,087,784 1,087,784
Corporate Finance    
Goodwill    
April 1, 2022   815,912
Changes 17,342  
March 31, 2022 833,254 833,254
Financial Restructuring    
Goodwill    
April 1, 2022   162,815
Changes 0  
March 31, 2022 162,815 162,815
Financial and Valuation Advisory    
Goodwill    
April 1, 2022   91,715
Changes 0  
March 31, 2022 $ 91,715 $ 91,715