RESTRUCTURING CHARGES - Schedule of Restructuring Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 3,696	$ 1,955	$ 272
Restructuring charges to operations	18,908	6,022	4,306
Cash payments	(22,027)	(3,572)	(2,328)
Other adjustments	(577)	(709)	(295)
Ending Balance	0	3,696	1,955
Employee-Related | FY2016 Plan
Restructuring Reserve [Roll Forward]
Beginning Balance	0	0	272
Restructuring charges to operations	0	0	0
Cash payments	0	0	(272)
Other adjustments	0	0	0
Ending Balance	0	0	0
Employee-Related | Q1 FY2017 Plan
Restructuring Reserve [Roll Forward]
Beginning Balance	0	0	0
Restructuring charges to operations	0	0	2,034
Cash payments	0	0	(1,739)
Other adjustments	0	0	(295)
Ending Balance	0	0	0
Employee-Related | Q4 FY2017 Plan
Restructuring Reserve [Roll Forward]
Beginning Balance	0	1,550	0
Restructuring charges to operations	0	729	1,867
Cash payments	0	(1,867)	(317)
Other adjustments	0	(412)	0
Ending Balance	0	0	1,550
Employee-Related | FY2018 Plan
Restructuring Reserve [Roll Forward]
Beginning Balance	3,696	0	0
Restructuring charges to operations	1,017	5,085	0
Cash payments	(4,240)	(1,331)	0
Other adjustments	(473)	(58)	0
Ending Balance	0	3,696	0
Employee-Related | VSP
Restructuring Reserve [Roll Forward]
Beginning Balance	0	0	0
Restructuring charges to operations	17,248	0	0
Cash payments	(17,329)	0	0
Other adjustments	81	0	0
Ending Balance	0	0	0
Facilities Related | Q4 FY2017 Plan
Restructuring Reserve [Roll Forward]
Beginning Balance	0	405	0
Restructuring charges to operations	0	208	405
Cash payments	0	(374)	0
Other adjustments	0	(239)	0
Ending Balance	0	0	405
Facilities Related | FY2018 Plan
Restructuring Reserve [Roll Forward]
Beginning Balance	0	0	0
Restructuring charges to operations	643	0	0
Cash payments	(458)	0	0
Other adjustments	(185)	0	0
Ending Balance	$ 0	$ 0	$ 0