RESTRUCTURING CHARGES - Narrative (Details) $ in Thousands	12 Months Ended
	Mar. 31, 2018 USD ($) Employee	Mar. 31, 2017 USD ($) plan Employee	Mar. 31, 2016 USD ($) Employee
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 5,209	$ 4,001	$ 468
Number of restructuring plans | plan		2
Employee-Related
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 500
Number of employees terminated | Employee			1
FY2017 Plans
Restructuring Cost and Reserve [Line Items]
Restructuring charges	900
Q1 FY2017 Plan | Employee-Related
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 2,000
Number of employees terminated | Employee		19
Q4 FY2017 Plan | Employee-Related
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 1,900
Number of employees terminated | Employee		41
Q4 FY2017 Plan | Facilities Related
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 400
Q3 FY2018 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring expected cost remaining	1,700
Q3 FY2018 Plan | Employee-Related
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 5,100
Number of employees terminated | Employee	61