RESTRUCTURING CHARGES - Schedule of Restructuring Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 1,720	$ 0	$ 3,696
Restructuring charges to operations	62	2,657	18,908
Cash payments	(1,863)	(896)	(22,027)
Other adjustments	81	(41)	(577)
Ending Balance	0	1,720	0
Employee-Related | FY2018 Plan
Restructuring Reserve [Roll Forward]
Beginning Balance	0	0	3,696
Restructuring charges to operations	0	0	1,017
Cash payments	0	0	(4,240)
Other adjustments	0	0	(473)
Ending Balance	0	0	0
Employee-Related | VSP
Restructuring Reserve [Roll Forward]
Beginning Balance	0	0	0
Restructuring charges to operations	0	123	17,248
Cash payments	0	(123)	(17,329)
Other adjustments	0	0	81
Ending Balance	0	0	0
Employee-Related | Q2 FY20 Plan
Restructuring Reserve [Roll Forward]
Beginning Balance	3	0	0
Restructuring charges to operations	0	465	0
Cash payments	(3)	(434)	0
Other adjustments	0	(28)	0
Ending Balance	0	3	0
Employee-Related | Q4 FY20 Plan
Restructuring Reserve [Roll Forward]
Beginning Balance	1,717	0	0
Restructuring charges to operations	62	2,069	0
Cash payments	(1,860)	(339)	0
Other adjustments	81	(13)	0
Ending Balance	0	1,717	0
Facilities Related | FY2018 Plan
Restructuring Reserve [Roll Forward]
Beginning Balance	0	0	0
Restructuring charges to operations	0	0	643
Cash payments	0	0	(458)
Other adjustments	0	0	(185)
Ending Balance	$ 0	$ 0	$ 0