SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Statement of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	$ (9,937)	$ (26,048)	$ (97,079)	$ (97,227)
Currency translation adjustments	(57)	(18,896)	20,394	(31,470)
Total comprehensive loss	(9,994)	(44,944)	(76,685)	(128,697)
Net loss attributable to noncontrolling interests	1,664	4,121	2,322	4,731
Currency translation adjustments attributable to noncontrolling interests	(17)	(687)	530	(5,652)
Total comprehensive (income) loss attributable to noncontrolling interests	1,647	3,434	2,852	(921)
Total comprehensive loss attributable to Bristow Group	(8,347)	(41,510)	(73,833)	(129,618)
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	11,503	(4,561)	22,506	17,905
Currency translation adjustments	(1,155)	(7,104)	(9,918)	(227,912)
Total comprehensive loss	10,348	(11,665)	12,588	(210,007)
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	10,348	(11,665)	12,588	(210,007)
Parent Company Only
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(8,261)	(21,913)	(94,721)	(92,455)
Currency translation adjustments	0	0	0	0
Total comprehensive loss	(8,261)	(21,913)	(94,721)	(92,455)
Net loss attributable to noncontrolling interests	(12)	(13)	(36)	(40)
Currency translation adjustments attributable to noncontrolling interests	0	0	0	0
Total comprehensive (income) loss attributable to noncontrolling interests	(12)	(13)	(36)	(40)
Total comprehensive loss attributable to Bristow Group	(8,273)	(21,926)	(94,757)	(92,495)
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(2,787)	6,905	9,613	(13,417)
Currency translation adjustments	(18)	0	626	0
Total comprehensive loss	(2,805)	6,905	10,239	(13,417)
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	(2,805)	6,905	10,239	(13,417)
Non- Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(10,392)	(6,479)	(34,477)	(9,260)
Currency translation adjustments	1,116	(11,792)	29,686	196,442
Total comprehensive loss	(9,276)	(18,271)	(4,791)	187,182
Net loss attributable to noncontrolling interests	1,676	4,134	2,358	4,771
Currency translation adjustments attributable to noncontrolling interests	(17)	(687)	530	(5,652)
Total comprehensive (income) loss attributable to noncontrolling interests	1,659	3,447	2,888	(881)
Total comprehensive loss attributable to Bristow Group	$ (7,617)	$ (14,824)	$ (1,903)	$ 186,301