SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION OCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	$ (176,890)	$ (77,149)	$ 88,707
Currency translation adjustments	(21,636)	(21,604)	(71,617)
Pension liability adjustment	(11,511)	705	(36,978)
Total comprehensive income (loss)	(210,037)	(98,048)	(19,888)
Net (income) loss attributable to noncontrolling interests	6,354	4,707	(4,407)
Currency translation adjustments attributable to noncontrolling interests	(5,311)	1,409	(5,228)
Total comprehensive (income) loss attributable to noncontrolling interests	1,043	6,116	(9,635)
Total comprehensive loss attributable to Bristow Group	(208,994)	(91,932)	(29,523)
Accretion of redeemable noncontrolling interests	0	(1,498)	0
Total comprehensive income (loss) attributable to common stockholders	(208,994)	(93,430)	(29,523)
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	28,161	(1,230)	(44,687)
Currency translation adjustments	(231,089)	165,206	(70,584)
Pension liability adjustment	0	0	0
Total comprehensive income (loss)	(202,928)	163,976	(115,271)
Net (income) loss attributable to noncontrolling interests	0	0	0
Currency translation adjustments attributable to noncontrolling interests	0	0	0
Total comprehensive (income) loss attributable to noncontrolling interests	0	0	0
Total comprehensive loss attributable to Bristow Group	(202,928)	163,976	(115,271)
Accretion of redeemable noncontrolling interests		0
Total comprehensive income (loss) attributable to common stockholders		163,976
Parent Company Only
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(170,486)	(72,385)	84,359
Currency translation adjustments	0	2	(25,885)
Pension liability adjustment	0	0	0
Total comprehensive income (loss)	(170,486)	(72,383)	58,474
Net (income) loss attributable to noncontrolling interests	(50)	(57)	(59)
Currency translation adjustments attributable to noncontrolling interests	0	0	0
Total comprehensive (income) loss attributable to noncontrolling interests	(50)	(57)	(59)
Total comprehensive loss attributable to Bristow Group	(170,536)	(72,440)	58,415
Accretion of redeemable noncontrolling interests		0
Total comprehensive income (loss) attributable to common stockholders		(72,440)
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(24,107)	1,171	88,287
Currency translation adjustments	388	0	0
Pension liability adjustment	0	0	0
Total comprehensive income (loss)	(23,719)	1,171	88,287
Net (income) loss attributable to noncontrolling interests	0	0	0
Currency translation adjustments attributable to noncontrolling interests	0	0	0
Total comprehensive (income) loss attributable to noncontrolling interests	0	0	0
Total comprehensive loss attributable to Bristow Group	(23,719)	1,171	88,287
Accretion of redeemable noncontrolling interests		0
Total comprehensive income (loss) attributable to common stockholders		1,171
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(10,458)	(4,705)	(39,252)
Currency translation adjustments	209,065	(186,812)	24,852
Pension liability adjustment	(11,511)	705	(36,978)
Total comprehensive income (loss)	187,096	(190,812)	(51,378)
Net (income) loss attributable to noncontrolling interests	6,404	4,764	(4,348)
Currency translation adjustments attributable to noncontrolling interests	(5,311)	1,409	(5,228)
Total comprehensive (income) loss attributable to noncontrolling interests	1,093	6,173	(9,576)
Total comprehensive loss attributable to Bristow Group	$ 188,189	(184,639)	$ (60,954)
Accretion of redeemable noncontrolling interests		(1,498)
Total comprehensive income (loss) attributable to common stockholders		$ (186,137)