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GOODWILL AND INTANGIBLE ASSETS: (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Goodwill    
Goodwill at the beginning of year $ 203,639 $ 200,393
Acquisition   3,260
Purchase accounting adjustments   (21)
Change in foreign currency translation adjustment (360) 7
Reallocation from AMS 1,377  
Goodwill at the end of year $ 204,656 203,639
Accumulated impairment losses   $ 120,100
Minimum    
Goodwill    
Amortization period 4 years  
Maximum    
Goodwill    
Amortization period 6 years  
U.S. reporting unit    
Goodwill    
Goodwill at the end of year $ 201,449  
APAC    
Goodwill    
Goodwill at the end of year $ 3,207