RESTRUCTURING CHARGES - Narrative (Details) $ in Thousands	12 Months Ended
	Mar. 31, 2020 USD ($) plan	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 2,674	$ 18,693	$ 5,209
Number of restructuring plans | plan	2
FY2017 Plans
Restructuring Cost and Reserve [Line Items]
Restructuring charges			900
FY2018 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges		1,700
VSP
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 100	$ 17,200
Employee-Related | Q4 FY2017 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges				$ 1,900
Employee-Related | FY2018 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 5,100
Employee-Related | Q2 FY20 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	500
Employee-Related | Q4 FY20 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 2,100
Facilities Related | Q4 FY2017 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges				$ 400