SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Statement of Operations (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]
Revenue	$ 373,676	$ 357,467	$ 725,785	$ 726,865
Direct cost and reimbursable expense	300,127	294,906	597,904	597,063
Intercompany expenses	0	0	0	0
Depreciation and amortization	31,381	28,592	62,437	63,286
General and administrative	48,622	51,274	95,329	103,869
Operating expense	380,130	374,772	755,670	764,218
Loss on impairment	0	(7,572)	(1,192)	(7,572)
Gain (loss) on disposal of assets	(8,526)	(2,186)	(7,827)	(12,203)
Earnings from unconsolidated affiliates, net of losses	2,063	181	1,398	4,011
Operating loss	(12,917)	(26,882)	(37,506)	(53,117)
Interest expense, net	(18,563)	(11,468)	(34,584)	(22,354)
Other income (expense), net	2,558	3,003	913	(3,186)
Income (loss) before (provision) benefit for income taxes	(28,922)	(35,347)	(71,177)	(78,657)
Benefit (provision) for income taxes	(2,474)	5,240	(15,965)	7,478
Net loss	(31,396)	(30,107)	(87,142)	(71,179)
Net (income) loss attributable to noncontrolling interests	187	310	658	610
Net loss attributable to Bristow Group	(31,209)	(29,797)	(86,484)	(70,569)
External Customer
Condensed Financial Statements, Captions [Line Items]
Revenue	373,676	357,467	725,785	726,865
Intercompany Customer
Condensed Financial Statements, Captions [Line Items]
Revenue	0	0	0	0
Eliminations
Condensed Financial Statements, Captions [Line Items]
Revenue	(31,719)	(24,323)	(63,910)	(48,614)
Direct cost and reimbursable expense	0	0	0	0
Intercompany expenses	(31,719)	(24,323)	(63,910)	(48,614)
Depreciation and amortization	0	0	0	0
General and administrative	0	0	0	0
Operating expense	(31,719)	(24,323)	(63,910)	(48,614)
Loss on impairment		0	0	0
Gain (loss) on disposal of assets	0	0	0	0
Earnings from unconsolidated affiliates, net of losses	(9,642)	9,690	11,003	22,466
Operating loss	(9,642)	9,690	11,003	22,466
Interest expense, net	0	0	0	0
Other income (expense), net	0	0	0	0
Income (loss) before (provision) benefit for income taxes	(9,642)	9,690	11,003	22,466
Benefit (provision) for income taxes	0	0	0	0
Net loss	(9,642)	9,690	11,003	22,466
Net (income) loss attributable to noncontrolling interests	0	0	0	0
Net loss attributable to Bristow Group	(9,642)	9,690	11,003	22,466
Eliminations | External Customer
Condensed Financial Statements, Captions [Line Items]
Revenue	0	0	0	0
Eliminations | Intercompany Customer
Condensed Financial Statements, Captions [Line Items]
Revenue	(31,719)	(24,323)	(63,910)	(48,614)
Parent Company Only
Condensed Financial Statements, Captions [Line Items]
Revenue	0	0	0	0
Direct cost and reimbursable expense	3,263	(374)	3,269	(631)
Intercompany expenses	0	0	0	0
Depreciation and amortization	3,016	2,223	5,933	4,316
General and administrative	17,880	17,487	36,987	37,746
Operating expense	24,159	19,336	46,189	41,431
Loss on impairment		0	0	0
Gain (loss) on disposal of assets	0	0	0	0
Earnings from unconsolidated affiliates, net of losses	9,642	(9,647)	(11,003)	(22,423)
Operating loss	(14,517)	(28,983)	(57,192)	(63,854)
Interest expense, net	(10,636)	(10,347)	(19,694)	(20,232)
Other income (expense), net	(97)	206	(126)	752
Income (loss) before (provision) benefit for income taxes	(25,250)	(39,124)	(77,012)	(83,334)
Benefit (provision) for income taxes	(5,946)	9,339	(9,448)	12,792
Net loss	(31,196)	(29,785)	(86,460)	(70,542)
Net (income) loss attributable to noncontrolling interests	(13)	(12)	(24)	(27)
Net loss attributable to Bristow Group	(31,209)	(29,797)	(86,484)	(70,569)
Parent Company Only | External Customer
Condensed Financial Statements, Captions [Line Items]
Revenue	0	0	0	0
Parent Company Only | Intercompany Customer
Condensed Financial Statements, Captions [Line Items]
Revenue	0	0	0	0
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenue	78,671	66,866	156,637	136,470
Direct cost and reimbursable expense	45,955	47,858	98,289	96,476
Intercompany expenses	0	0	0	0
Depreciation and amortization	13,237	10,805	25,720	27,786
General and administrative	5,623	6,490	11,385	13,080
Operating expense	64,815	65,153	135,394	137,342
Loss on impairment		(4,761)	(1,192)	(4,761)
Gain (loss) on disposal of assets	10,597	(1,348)	11,013	(11,575)
Earnings from unconsolidated affiliates, net of losses	0	0	0	0
Operating loss	24,453	(4,396)	31,064	(17,208)
Interest expense, net	(6,023)	(371)	(11,803)	(1,028)
Other income (expense), net	(399)	411	(756)	1,646
Income (loss) before (provision) benefit for income taxes	18,031	(4,356)	18,505	(16,590)
Benefit (provision) for income taxes	(1,945)	(1,510)	(6,105)	(3,732)
Net loss	16,086	(5,866)	12,400	(20,322)
Net (income) loss attributable to noncontrolling interests	0	0	0	0
Net loss attributable to Bristow Group	16,086	(5,866)	12,400	(20,322)
Guarantor Subsidiaries | External Customer
Condensed Financial Statements, Captions [Line Items]
Revenue	46,952	42,543	92,727	87,856
Guarantor Subsidiaries | Intercompany Customer
Condensed Financial Statements, Captions [Line Items]
Revenue	31,719	24,323	63,910	48,614
Non- Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenue	326,724	314,924	633,058	639,009
Direct cost and reimbursable expense	250,909	247,422	496,346	501,218
Intercompany expenses	31,719	24,323	63,910	48,614
Depreciation and amortization	15,128	15,564	30,784	31,184
General and administrative	25,119	27,297	46,957	53,043
Operating expense	322,875	314,606	637,997	634,059
Loss on impairment		(2,811)	0	(2,811)
Gain (loss) on disposal of assets	(19,123)	(838)	(18,840)	(628)
Earnings from unconsolidated affiliates, net of losses	2,063	138	1,398	3,968
Operating loss	(13,211)	(3,193)	(22,381)	5,479
Interest expense, net	(1,904)	(750)	(3,087)	(1,094)
Other income (expense), net	3,054	2,386	1,795	(5,584)
Income (loss) before (provision) benefit for income taxes	(12,061)	(1,557)	(23,673)	(1,199)
Benefit (provision) for income taxes	5,417	(2,589)	(412)	(1,582)
Net loss	(6,644)	(4,146)	(24,085)	(2,781)
Net (income) loss attributable to noncontrolling interests	200	322	682	637
Net loss attributable to Bristow Group	(6,444)	(3,824)	(23,403)	(2,144)
Non- Guarantor Subsidiaries | External Customer
Condensed Financial Statements, Captions [Line Items]
Revenue	326,724	314,924	633,058	639,009
Non- Guarantor Subsidiaries | Intercompany Customer
Condensed Financial Statements, Captions [Line Items]
Revenue	$ 0	$ 0	$ 0	$ 0