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GOODWILL & INTANGIBLE ASSETS - Schedule of Changes in Carrying Amount of Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Goodwill [Roll Forward]    
Beginning balance $ 1,715,485 $ 1,712,764
Divestiture of the HNT tools business   (4,414)
Foreign currency translation impact 5,376 7,135
Ending balance 1,725,680 $ 1,715,485
Eastwind    
Goodwill [Roll Forward]    
Goodwill attributed to acquisition 1,003  
Gigavation    
Goodwill [Roll Forward]    
Goodwill attributed to acquisition $ 3,816