RESTRUCTURING CHARGES - Narrative (Details) $ in Thousands	3 Months Ended				6 Months Ended	9 Months Ended		12 Months Ended
	Dec. 31, 2017 USD ($) Employee	Sep. 30, 2017 USD ($)	Mar. 31, 2017 Employee	Dec. 31, 2016 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Mar. 31, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 3,363			$ (199)		$ 3,821	$ 1,730
Q4 FY2017 Plan | Employee-Related
Restructuring Cost and Reserve [Line Items]
Number of employees terminated | Employee			41
Restructuring charges					$ 700			$ 1,900
Q4 FY2017 Plan | Facilities Related
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 400
Q3 FY 2018 Plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs to be recorded	$ 2,700					$ 2,700
Q3 FY 2018 Plan | Employee-Related
Restructuring Cost and Reserve [Line Items]
Number of employees terminated | Employee	67
Restructuring charges	$ 3,600