VARIABLE INTEREST ENTITIES - Statements of Operations of VIEs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Revenue	$ 331,329	$ 360,735	$ 1,049,880	$ 1,086,520
Net loss	(85,701)	(9,937)	(261,415)	(97,079)
Bristow Aviation Holdings Limited
Variable Interest Entity [Line Items]
Revenue	292,047	309,461	935,304	933,387
Operating income (loss)	(9,496)	(17,463)	(40,642)	(40,095)
Net loss	$ (85,922)	$ (79,789)	$ (270,263)	$ (221,039)