RESTRUCTURING CHARGES - Schedule of Restructuring Liability (Details) $ in Thousands	6 Months Ended
	Sep. 30, 2018 USD ($)
Restructuring Reserve [Roll Forward]
Balance at March 31, 2018	$ 3,696
Restructuring charges to operations	3,944
Cash payments	(6,670)
Other adjustments	(647)
Balance at September 30, 2018	323
Q3 FY 2018 Plan | Employee-Related
Restructuring Reserve [Roll Forward]
Balance at March 31, 2018	3,696
Restructuring charges to operations	1,017
Cash payments	(4,241)
Other adjustments	(462)
Balance at September 30, 2018	10
Q3 FY 2018 Plan | Facility-Related
Restructuring Reserve [Roll Forward]
Balance at March 31, 2018	0
Restructuring charges to operations	643
Cash payments	(458)
Other adjustments	(185)
Balance at September 30, 2018	0
VSP | Employee-Related
Restructuring Reserve [Roll Forward]
Balance at March 31, 2018	0
Restructuring charges to operations	2,284
Cash payments	(1,971)
Other adjustments	0
Balance at September 30, 2018	$ 313