SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION OCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	$ (55,746)	$ (41,072)
Currency translation adjustments	9,760	(7,135)
Total comprehensive income (loss)	(45,986)	(48,207)
Net (income) loss attributable to noncontrolling interests	471	300
Currency translation adjustments attributable to noncontrolling interests	310	(4,442)
Total comprehensive (income) loss attributable to noncontrolling interests	781	(4,142)
Total comprehensive (income) loss attributable to Bristow Group	(45,205)	(52,349)
Consolidations, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	20,645	12,776
Currency translation adjustments	(4,930)	(224,927)
Total comprehensive income (loss)	15,715	(212,151)
Net (income) loss attributable to noncontrolling interests	0	0
Currency translation adjustments attributable to noncontrolling interests	0	0
Total comprehensive (income) loss attributable to noncontrolling interests	0	0
Total comprehensive (income) loss attributable to Bristow Group	15,715	(212,151)
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(55,264)	(40,757)
Currency translation adjustments	0	0
Total comprehensive income (loss)	(55,264)	(40,757)
Net (income) loss attributable to noncontrolling interests	(11)	(15)
Currency translation adjustments attributable to noncontrolling interests	0	0
Total comprehensive (income) loss attributable to noncontrolling interests	(11)	(15)
Total comprehensive (income) loss attributable to Bristow Group	(55,275)	(40,772)
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(3,686)	(14,456)
Currency translation adjustments	338	0
Total comprehensive income (loss)	(3,348)	(14,456)
Net (income) loss attributable to noncontrolling interests	0	0
Currency translation adjustments attributable to noncontrolling interests	0	0
Total comprehensive (income) loss attributable to noncontrolling interests	0	0
Total comprehensive (income) loss attributable to Bristow Group	(3,348)	(14,456)
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(17,441)	1,365
Currency translation adjustments	14,352	217,792
Total comprehensive income (loss)	(3,089)	219,157
Net (income) loss attributable to noncontrolling interests	482	315
Currency translation adjustments attributable to noncontrolling interests	310	(4,442)
Total comprehensive (income) loss attributable to noncontrolling interests	792	(4,127)
Total comprehensive (income) loss attributable to Bristow Group	$ (2,297)	$ 215,030