REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Mar. 31, 2018
Disaggregated Revenue [Line Items]
Unbilled revenue	$ 42,930		$ 42,930		$ 47,407
Revenue	151,509	$ 119,819	261,732	$ 233,817
Telecom
Disaggregated Revenue [Line Items]
Revenue	71,457	76,682	133,306	151,592
Retail & E-Commerce
Disaggregated Revenue [Line Items]
Revenue	25,746	12,927	40,461	24,715
Media, Publishing and Entertainment
Disaggregated Revenue [Line Items]
Revenue	16,604	3,043	19,671	5,950
Financial services
Disaggregated Revenue [Line Items]
Revenue	9,017	8,349	18,090	14,718
Healthcare
Disaggregated Revenue [Line Items]
Revenue	5,396	1,976	7,216	3,868
Transport and Logistics
Disaggregated Revenue [Line Items]
Revenue	3,342	1,941	6,741	3,671
Other
Disaggregated Revenue [Line Items]
Revenue	$ 19,947	$ 14,901	$ 36,247	$ 29,303