BASIS OF PRESENTATION, CONSOLIDATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accumulated Goodwill Impairment (Details) $ in Thousands	6 Months Ended
	Sep. 30, 2017 USD ($)
Goodwill, Impaired, Accumulated Impairment Loss [Roll Forward]
March 31, 2017	$ (50,861)
Goodwill, Impairment Loss	0
September 30, 2017	(50,861)
Europe Caspian
Goodwill, Impaired, Accumulated Impairment Loss [Roll Forward]
March 31, 2017	(33,883)
Goodwill, Impairment Loss	0
September 30, 2017	(33,883)
Africa
Goodwill, Impaired, Accumulated Impairment Loss [Roll Forward]
March 31, 2017	(6,179)
Goodwill, Impairment Loss	0
September 30, 2017	(6,179)
Americas
Goodwill, Impaired, Accumulated Impairment Loss [Roll Forward]
March 31, 2017	(576)
Goodwill, Impairment Loss	0
September 30, 2017	(576)
Corporate and other
Goodwill, Impaired, Accumulated Impairment Loss [Roll Forward]
March 31, 2017	(10,223)
Goodwill, Impairment Loss	0
September 30, 2017	$ (10,223)