PENSION BENEFIT PLANS - Defined Benefit Pension Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, at beginning of year	$ 29,188	$ 0
Service cost	329	279
Interest cost	638	391
Benefits paid and other	(231)	(175)
Acquisitions	0	29,033
Actuarial loss (gain)	1,226	(847)
Foreign exchange rate impact	(1,009)	507
Benefit obligation, at end of year	30,141	29,188
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, at beginning of year	0	0
Employer direct benefit payments	231	175
Benefits paid and other	(231)	(175)
Fair value of plan assets, at end of year	0	0
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	329	279
Interest cost	638	391
Net periodic pension cost	$ 967	$ 670
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	2.10%	2.30%
Rate of compensation increase	2.25%	2.25%