RESTRUCTURING AND OTHER RELATED CHARGES (Details) $ in Thousands	3 Months Ended			9 Months Ended
	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) position	Dec. 31, 2014 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | position		125
Expected restructuring charges		$ 12,600		$ 12,600
Restructuring Reserve [Roll Forward]
Balance at March 31, 2015	$ 8,433			0
Charges included in operating expense		8,433	$ 0	8,433	$ 0
Cash payments during the period				0
Balance at December 31, 2015		8,433		8,433
Severance and related benefits [Member]
Restructuring Reserve [Roll Forward]
Charges included in operating expense		8,433
Voluntary termination benefits [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges		$ 5,800		$ 5,800
Forecast [Member]
Restructuring Cost and Reserve [Line Items]
Expected reduction of stock-based compensation expense	$ 1,600