ACCUMULATED OTHER COMPREHENSIVE LOSS (Reclassification) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of services	$ 128,747	$ 99,762	$ 222,087	$ 196,265
Selling, general and administrative expenses	22,818	14,219	38,075	27,827
Net income (loss)	(10,890)	2,855	(14,664)	5,925
Amount Reclassified from Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income (loss)	(520)	(567)	(1,003)	(1,134)
Defined Benefit Plan | Amount Reclassified from Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of services	(483)	(567)	(966)	(1,134)
Foreign Exchange Contract | Foreign Currency Translation Adjustment | Amount Reclassified from Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of services	(35)	0	(35)	0
Selling, general and administrative expenses	$ (2)	$ 0	$ (2)	$ 0