COMMITMENTS AND CONTINGENCIES - Separation Programs (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2017 Employee	Apr. 01, 2016 Employee
Restructuring Cost and Reserve [Line Items]
Named executive | Employee					2	1
Voluntary separation program
Restructuring Cost and Reserve [Line Items]
Severance costs	$ 0	$ 179	$ 0	$ 1,647
Involuntary separation program
Restructuring Cost and Reserve [Line Items]
Severance costs	2,781	566	13,870	14,057
Direct cost | Voluntary separation program
Restructuring Cost and Reserve [Line Items]
Severance costs	0	179	0	1,624
Direct cost | Involuntary separation program
Restructuring Cost and Reserve [Line Items]
Severance costs	2,661	464	5,208	5,360
General and administrative | Voluntary separation program
Restructuring Cost and Reserve [Line Items]
Severance costs	0	0	0	23
General and administrative | Involuntary separation program
Restructuring Cost and Reserve [Line Items]
Severance costs	$ 120	$ 102	$ 8,662	$ 8,697