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BUSINESS COMBINATIONS, Systems Management Planning (SMP) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Mar. 31, 2019
Allocation of Purchase Price Consideration to Assets Acquired and Liabilities Assumed [Abstract]        
Goodwill $ 126,645   $ 118,097 $ 110,807
Systems Management Planning (SMP) [Member]        
Business Combination [Abstract]        
Cash portion of the acquisition 29,000      
Receivable related to working capital adjustment $ 2,000      
Allocation of Purchase Price Consideration to Assets Acquired and Liabilities Assumed [Abstract]        
Accounts receivable   $ 14,526    
Other assets   3,344    
Identified intangible assets   14,280    
Accounts payable and other current liabilities   (11,424)    
Performance obligation   (2,020)    
Total identifiable net assets   18,706    
Goodwill   8,328    
Total purchase consideration   $ 27,034    
Systems Management Planning (SMP) [Member] | Customer Relationships [Member]        
Allocation of Purchase Price Consideration to Assets Acquired and Liabilities Assumed [Abstract]        
Estimated useful lives 7 years