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GOODWILL (Tables)
 6 Months Ended
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of changes in the carrying value of goodwill by reportable segment
 
Integrated Systems
 
Product Support
 
Total
Balance, March 31, 2019
$
517,104

 
$
66,121

 
$
583,225

Effect of exchange rate changes
(4,309
)
 
—

 
(4,309
)
Balance, September 30, 2019
$
512,795

 
$
66,121

 
$
578,916