SEGMENT INFORMATION - Revenue by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenue	$ 331,329	$ 360,735	$ 1,049,880	$ 1,086,520
Europe Caspian
Segment Reporting Information [Line Items]
Revenue	188,450	198,439	612,431	596,280
Africa
Segment Reporting Information [Line Items]
Revenue	43,830	48,712	119,638	149,289
Americas
Segment Reporting Information [Line Items]
Revenue	57,931	60,615	170,554	179,822
Asia Pacific
Segment Reporting Information [Line Items]
Revenue	43,829	55,691	155,653	167,421
Corporate and other
Segment Reporting Information [Line Items]
Revenue	465	911	1,363	4,126
External Customer
Segment Reporting Information [Line Items]
Revenue	331,329	360,735	1,049,880	1,086,520
External Customer | Europe Caspian
Segment Reporting Information [Line Items]
Revenue	186,537	196,958	606,584	592,280
External Customer | Africa
Segment Reporting Information [Line Items]
Revenue	43,830	48,712	119,638	149,289
External Customer | Americas
Segment Reporting Information [Line Items]
Revenue	56,669	58,468	166,644	173,431
External Customer | Asia Pacific
Segment Reporting Information [Line Items]
Revenue	43,829	55,691	155,653	167,421
External Customer | Corporate and other
Segment Reporting Information [Line Items]
Revenue	464	906	1,361	4,099
Intersegment elimination
Segment Reporting Information [Line Items]
Revenue	3,176	3,633	9,759	10,418
Intersegment elimination | Europe Caspian
Segment Reporting Information [Line Items]
Revenue	1,913	1,481	5,847	4,000
Intersegment elimination | Africa
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
Intersegment elimination | Americas
Segment Reporting Information [Line Items]
Revenue	1,262	2,147	3,910	6,391
Intersegment elimination | Asia Pacific
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
Intersegment elimination | Corporate and other
Segment Reporting Information [Line Items]
Revenue	1	$ 5	2	$ 27
Revenue Not from Contract with Customer [Member]
Segment Reporting Information [Line Items]
Revenue	9,800		41,800
Revenue Not from Contract with Customer [Member] | Europe Caspian
Segment Reporting Information [Line Items]
Revenue	1,700		18,800
Revenue Not from Contract with Customer [Member] | Americas
Segment Reporting Information [Line Items]
Revenue	8,000		22,800
Revenue Not from Contract with Customer [Member] | Asia Pacific
Segment Reporting Information [Line Items]
Revenue	$ 100		$ 200