COMMITMENTS AND CONTINGENCIES - Separation Programs (Details) - Involuntary separation program - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Severance costs	$ 2,409	$ 2,781	$ 6,855	$ 13,870
Direct cost
Restructuring Cost and Reserve [Line Items]
Severance costs	2,096	2,661	4,809	5,208
General and administrative
Restructuring Cost and Reserve [Line Items]
Severance costs	$ 313	$ 120	$ 2,046	$ 8,662