BANKRUPTCY AND RELATED MATTERS Debtors in Possession Unaudited Condensed Combined Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue	$ 318,220	$ 349,343	$ 651,396	$ 716,011
Direct cost and reimbursable expense	249,495	292,411	523,388	588,366
Prepetition restructuring charges	0	0	13,476	0
Depreciation and amortization	31,303	30,489	62,642	61,430
General and administrative	37,820	38,839	72,590	78,940
Operating expenses	318,618	361,739	672,096	728,736
Loss on impairment	(62,101)	(117,220)	(62,101)	(117,220)
Loss on disposal of assets	(230)	(1,293)	(4,017)	(2,971)
Operating loss	(62,096)	(129,448)	(83,838)	(133,002)
Interest expense, net	(22,445)	(26,433)	(48,766)	(53,577)
Reorganization items	(93,943)	0	(170,299)	0
Other expense, net	(6,637)	(3,204)	(10,510)	(7,154)
Loss before benefit for income taxes	(184,701)	(159,085)	(369,296)	(193,733)
Benefit for income taxes	21,782	15,655	37,289	18,506
Net loss	(162,919)	(143,430)	(332,007)	(175,227)
Net income attributable to noncontrolling interests	(55)	(517)	(213)	(584)
Net loss attributable to Bristow Group	(162,974)	$ (143,947)	(332,220)	$ (175,811)
Debtor In Possession [Member]
Revenue	90,918		180,630
Direct cost and reimbursable expense	62,397		134,741
Prepetition restructuring charges	0		12,449
Depreciation and amortization	31,319		62,608
General and administrative	19,999		33,760
Operating expenses	113,715		243,558
Loss on impairment	(42,022)		(42,022)
Loss on disposal of assets	(375)		4,200
Operating loss	(65,194)		(100,750)
Interest expense, net	(18,364)		(39,817)
Reorganization items	(83,392)		(159,289)
Other expense, net	1,000		1,679
Loss before benefit for income taxes	(165,950)		(298,177)
Benefit for income taxes	25,291		44,350
Net loss	(140,659)		(253,827)
Net income attributable to noncontrolling interests	(10)		(24)
Net loss attributable to Bristow Group	$ (140,669)		$ (253,851)