VARIABLE INTEREST ENTITIES - Statements of Operations of VIEs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Variable Interest Entity [Line Items]
Revenue	$ 350,657	$ 373,676	$ 718,551	$ 725,785
Net loss	(143,673)	(31,396)	(175,714)	(87,142)
Bristow Aviation Holdings Limited
Variable Interest Entity [Line Items]
Revenue	311,788	321,956	643,257	623,926
Operating income (loss)	(38,510)	(2,978)	(31,146)	(22,632)
Net loss	$ (115,320)	$ (62,081)	$ (184,341)	$ (141,250)