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FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Assets [Abstract]      
Money market funds $ 50 $ 60,385 $ 50,866
Liabilities [Abstract]      
Contingent consideration 8,942 13,513 554
Initial contingent consideration due to business acquisitions   12,000  
Adjustment to fair value of contingent consideration 1,600 1,500  
Payments of contingent consideration 6,100 600  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]      
Assets [Abstract]      
Money market funds 50 60,385 50,866
Liabilities [Abstract]      
Contingent consideration 0 0 0
Significant Other Observable Inputs (Level 2) [Member]      
Assets [Abstract]      
Money market funds 0 0 0
Liabilities [Abstract]      
Contingent consideration 0 0 0
Significant Unobservable Inputs (Level 3) [Member]      
Assets [Abstract]      
Money market funds 0 0 0
Liabilities [Abstract]      
Contingent consideration $ 8,942 $ 13,513 $ 554