VARIABLE INTEREST ENTITIES - Statements of Operations of VIEs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Variable Interest Entity [Line Items]
Revenue	$ 318,220	$ 349,343	$ 651,396	$ 716,011
Net loss	(162,919)	(143,430)	(332,007)	(175,227)
Bristow Aviation Holdings Limited
Variable Interest Entity [Line Items]
Revenue	276,568	311,788	571,723	643,257
Operating income (loss)	(13,692)	(38,510)	(2,412)	(31,146)
Net loss	$ (21,034)	$ (115,320)	$ (383,882)	$ (184,341)