SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION OCI (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Net income	$ 88,707	$ 187,779	$ 131,675
Currency translation adjustments	(71,617)	18,729	(11,982)
Pension liability adjustment, net of tax provision (benefit)	(36,978)	23,367	(28,462)
Total comprehensive income	(19,888)	229,875	91,231
Net income attributable to noncontrolling interests	(4,407)	(1,042)	(1,573)
Currency translation adjustment attributable to noncontrolling interest	(5,228)	1,081	0
Total comprehensive (income) loss attributable to noncontrolling interests	(9,635)	39	(1,573)
Total comprehensive income (loss) attributable to Bristow Group	(29,523)	229,914	89,658
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net income	84,359	186,797	130,165
Currency translation adjustments	(25,885)	8,173	(1,186)
Pension liability adjustment, net of tax provision (benefit)	0	0	0
Total comprehensive income	58,474	194,970	128,979
Net income attributable to noncontrolling interests	(59)	(60)	(63)
Currency translation adjustment attributable to noncontrolling interest	0	0
Total comprehensive (income) loss attributable to noncontrolling interests	(59)	(60)	(63)
Total comprehensive income (loss) attributable to Bristow Group	58,415	194,910	128,916
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net income	88,287	71,509	86,782
Currency translation adjustments	0	0	0
Pension liability adjustment, net of tax provision (benefit)	0	0	0
Total comprehensive income	88,287	71,509	86,782
Net income attributable to noncontrolling interests	0	0	0
Currency translation adjustment attributable to noncontrolling interest	0	0
Total comprehensive (income) loss attributable to noncontrolling interests	0	0	0
Total comprehensive income (loss) attributable to Bristow Group	88,287	71,509	86,782
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net income	(39,252)	118,639	38,314
Currency translation adjustments	24,852	(40,402)	(6,383)
Pension liability adjustment, net of tax provision (benefit)	(36,978)	23,367	(28,462)
Total comprehensive income	(51,378)	101,604	3,469
Net income attributable to noncontrolling interests	(4,348)	(982)	(1,510)
Currency translation adjustment attributable to noncontrolling interest	(5,228)	1,081
Total comprehensive (income) loss attributable to noncontrolling interests	(9,576)	99	(1,510)
Total comprehensive income (loss) attributable to Bristow Group	(60,954)	101,703	1,959
Consolidations, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net income	(44,687)	(189,166)	(123,586)
Currency translation adjustments	(70,584)	50,958	(4,413)
Pension liability adjustment, net of tax provision (benefit)	0	0	0
Total comprehensive income	(115,271)	(138,208)	(127,999)
Net income attributable to noncontrolling interests	0	0	0
Currency translation adjustment attributable to noncontrolling interest	0	0
Total comprehensive (income) loss attributable to noncontrolling interests	0	0	0
Total comprehensive income (loss) attributable to Bristow Group	$ (115,271)	$ (138,208)	$ (127,999)