SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Statement of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	$ (31,396)	$ (30,107)	$ (87,142)	$ (71,179)
Currency translation adjustments	10,691	(5,439)	20,451	(12,574)
Total comprehensive loss	(20,705)	(35,546)	(66,691)	(83,753)
Net loss attributable to noncontrolling interests	187	310	658	610
Currency translation adjustments attributable to noncontrolling interests	237	(523)	547	(4,965)
Total comprehensive (income) loss attributable to noncontrolling interests	424	(213)	1,205	(4,355)
Total comprehensive loss attributable to Bristow Group	(20,281)	(35,759)	(65,486)	(88,108)
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(9,642)	9,690	11,003	22,466
Currency translation adjustments	(3,833)	4,119	(8,763)	(220,808)
Total comprehensive loss	(13,475)	13,809	2,240	(198,342)
Net loss attributable to noncontrolling interests	0	0	0	0
Currency translation adjustments attributable to noncontrolling interests	0	0	0	0
Total comprehensive (income) loss attributable to noncontrolling interests	0	0	0	0
Total comprehensive loss attributable to Bristow Group	(13,475)	13,809	2,240	(198,342)
Parent Company Only
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(31,196)	(29,785)	(86,460)	(70,542)
Currency translation adjustments	0	0	0	0
Total comprehensive loss	(31,196)	(29,785)	(86,460)	(70,542)
Net loss attributable to noncontrolling interests	(13)	(12)	(24)	(27)
Currency translation adjustments attributable to noncontrolling interests	0	0	0	0
Total comprehensive (income) loss attributable to noncontrolling interests	(13)	(12)	(24)	(27)
Total comprehensive loss attributable to Bristow Group	(31,209)	(29,797)	(86,484)	(70,569)
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	16,086	(5,866)	12,400	(20,322)
Currency translation adjustments	306	0	644	0
Total comprehensive loss	16,392	(5,866)	13,044	(20,322)
Net loss attributable to noncontrolling interests	0	0	0	0
Currency translation adjustments attributable to noncontrolling interests	0	0	0	0
Total comprehensive (income) loss attributable to noncontrolling interests	0	0	0	0
Total comprehensive loss attributable to Bristow Group	16,392	(5,866)	13,044	(20,322)
Non- Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(6,644)	(4,146)	(24,085)	(2,781)
Currency translation adjustments	14,218	(9,558)	28,570	208,234
Total comprehensive loss	7,574	(13,704)	4,485	205,453
Net loss attributable to noncontrolling interests	200	322	682	637
Currency translation adjustments attributable to noncontrolling interests	237	(523)	547	(4,965)
Total comprehensive (income) loss attributable to noncontrolling interests	437	(201)	1,229	(4,328)
Total comprehensive loss attributable to Bristow Group	$ 8,011	$ (13,905)	$ 5,714	$ 201,125