SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Statement of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	$ (85,701)	$ (9,937)	$ (261,415)	$ (97,079)
Currency translation adjustments	(6,462)	(57)	(43,462)	20,394
Pension liability adjustment	(2,410)	0	(2,410)	0
Unrealized gain on cash flow hedges	(5)	0	1,245	0
Total comprehensive loss	(94,578)	(9,994)	(306,042)	(76,685)
Net (income) loss attributable to noncontrolling interests	(243)	1,664	(827)	2,322
Currency translation adjustments attributable to noncontrolling interests	(52)	(17)	(223)	530
Total comprehensive (income) loss attributable to noncontrolling interests	(295)	1,647	(1,050)	2,852
Total comprehensive loss attributable to Bristow Group	(94,873)	(8,347)	(307,092)	(73,833)
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	22,023	11,503	153,319	22,506
Currency translation adjustments	3,056	(1,155)	63,209	(9,918)
Pension liability adjustment	0		0
Unrealized gain on cash flow hedges	0		0
Total comprehensive loss	25,079	10,348	216,528	12,588
Net (income) 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	25,079	10,348	216,528	12,588
Parent Company Only
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(85,929)	(8,261)	(262,199)	(94,721)
Currency translation adjustments	0	0	0	0
Pension liability adjustment	0		0
Unrealized gain on cash flow hedges	0		0
Total comprehensive loss	(85,929)	(8,261)	(262,199)	(94,721)
Net (income) loss attributable to noncontrolling interests	(15)	(12)	(43)	(36)
Currency translation adjustments attributable to noncontrolling interests	0	0	0	0
Total comprehensive (income) loss attributable to noncontrolling interests	(15)	(12)	(43)	(36)
Total comprehensive loss attributable to Bristow Group	(85,944)	(8,273)	(262,242)	(94,757)
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(20,546)	(2,787)	(123,998)	9,613
Currency translation adjustments	(372)	(18)	(1,417)	626
Pension liability adjustment	0		0
Unrealized gain on cash flow hedges	0		0
Total comprehensive loss	(20,918)	(2,805)	(125,415)	10,239
Net (income) 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	(20,918)	(2,805)	(125,415)	10,239
Non- Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(1,249)	(10,392)	(28,537)	(34,477)
Currency translation adjustments	(9,146)	1,116	(105,254)	29,686
Pension liability adjustment	(2,410)		(2,410)
Unrealized gain on cash flow hedges	(5)		1,245
Total comprehensive loss	(12,810)	(9,276)	(134,956)	(4,791)
Net (income) loss attributable to noncontrolling interests	(228)	1,676	(784)	2,358
Currency translation adjustments attributable to noncontrolling interests	(52)	(17)	(223)	530
Total comprehensive (income) loss attributable to noncontrolling interests	(280)	1,659	(1,007)	2,888
Total comprehensive loss attributable to Bristow Group	$ (13,090)	$ (7,617)	$ (135,963)	$ (1,903)