SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION IS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue	$ 450,355	$ 460,140	$ 475,636	$ 472,538	$ 440,925	$ 412,335	$ 417,328	$ 398,994	$ 1,858,669	$ 1,669,582	$ 1,508,473
Direct cost and reimbursable expense									1,299,557	1,186,132	1,057,794
Intercompany expenses									0	0	0
Impairment of inventories									7,167	12,669	0
Depreciation and amortization									114,293	95,977	96,284
General and administrative									254,158	199,814	163,389
Total operating expense									1,675,175	1,494,592	1,317,467
Gain (loss) on disposal of assets	(10,300)	(26,300)	100	600	100	4,000	(3,100)	(1,700)	(35,849)	(722)	8,068
Earnings from unconsolidated affiliates, net of losses									(1,771)	12,709	25,070
Operating income	27,702	8,916	44,064	65,192	47,421	29,502	53,935	56,119	145,874	186,977	224,144
Interest expense, net									(29,354)	(43,218)	(41,658)
Extinguishment of debt									(2,591)	0	(14,932)
Gain on sale of unconsolidated affiliate, net of losses									3,921	103,924	0
Other income (expense), net									(6,377)	(2,692)	(877)
Income before provision for income taxes									111,473	244,991	166,677
Provision for income taxes									(22,766)	(57,212)	(35,002)
Net income									88,707	187,779	131,675
Net income attributable to noncontrolling interests									(4,407)	(1,042)	(1,573)
Net income attributable to Bristow Group	15,077	(968)	26,082	44,109	30,318	18,927	110,606	26,886	84,300	186,737	130,102
External Customer [Member]
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue									1,858,669	1,669,582	1,508,473
Intercompany Customer [Member]
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue									0	0	0
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue									767	14,754	12,537
Direct cost and reimbursable expense									0	0	0
Intercompany expenses									0	0	0
Impairment of inventories									0	0
Depreciation and amortization									1,834	2,835	4,588
General and administrative									76,453	64,891	52,968
Total operating expense									78,287	67,726	57,556
Gain (loss) on disposal of assets									0	(45)	0
Earnings from unconsolidated affiliates, net of losses									44,731	189,209	123,586
Operating income									(32,789)	136,192	78,567
Interest expense, net									112,336	79,972	70,432
Extinguishment of debt									(2,591)		(14,932)
Gain on sale of unconsolidated affiliate, net of losses									0	0
Other income (expense), net									323	(174)	94
Income before provision for income taxes									77,279	215,990	134,161
Provision for income taxes									7,080	(29,193)	(3,996)
Net income									84,359	186,797	130,165
Net income attributable to noncontrolling interests									(59)	(60)	(63)
Net income attributable to Bristow Group									84,300	186,737	130,102
Parent Company [Member] | External Customer [Member]
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue									0	0	0
Parent Company [Member] | Intercompany Customer [Member]
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue									767	14,754	12,537
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue									391,647	382,454	367,356
Direct cost and reimbursable expense									212,216	219,873	208,995
Intercompany expenses									0	0	0
Impairment of inventories									0	6,988
Depreciation and amortization									46,098	43,052	38,851
General and administrative									39,898	33,925	29,252
Total operating expense									298,212	303,838	277,098
Gain (loss) on disposal of assets									269	4,312	2,474
Earnings from unconsolidated affiliates, net of losses									0	0	0
Operating income									93,704	82,928	92,732
Interest expense, net									(4,581)	(4,785)	17
Extinguishment of debt									0		0
Gain on sale of unconsolidated affiliate, net of losses									0	0
Other income (expense), net									483	(342)	103
Income before provision for income taxes									89,606	77,801	92,852
Provision for income taxes									(1,319)	(6,292)	(6,070)
Net income									88,287	71,509	86,782
Net income attributable to noncontrolling interests									0	0	0
Net income attributable to Bristow Group									88,287	71,509	86,782
Guarantor Subsidiaries [Member] | External Customer [Member]
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue									300,171	303,878	300,731
Guarantor Subsidiaries [Member] | Intercompany Customer [Member]
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue									91,476	78,576	66,625
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue									1,558,498	1,365,704	1,207,742
Direct cost and reimbursable expense									1,087,341	966,259	848,799
Intercompany expenses									92,243	93,330	79,162
Impairment of inventories									7,167	5,681
Depreciation and amortization									66,361	50,090	52,845
General and administrative									137,807	100,998	81,169
Total operating expense									1,390,919	1,216,358	1,061,975
Gain (loss) on disposal of assets									(36,118)	(4,989)	5,594
Earnings from unconsolidated affiliates, net of losses									(1,815)	12,666	25,070
Operating income									129,646	157,023	176,431
Interest expense, net									(137,109)	(118,405)	(112,107)
Extinguishment of debt									0		0
Gain on sale of unconsolidated affiliate, net of losses									3,921	103,924
Other income (expense), net									(7,183)	(2,176)	(1,074)
Income before provision for income taxes									(10,725)	140,366	63,250
Provision for income taxes									(28,527)	(21,727)	(24,936)
Net income									(39,252)	118,639	38,314
Net income attributable to noncontrolling interests									(4,348)	(982)	(1,510)
Net income attributable to Bristow Group									(43,600)	117,657	36,804
Non-Guarantor Subsidiaries [Member] | External Customer [Member]
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue									1,558,498	1,365,704	1,207,742
Non-Guarantor Subsidiaries [Member] | Intercompany Customer [Member]
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue									0	0	0
Consolidations, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue									(92,243)	(93,330)	(79,162)
Direct cost and reimbursable expense									0	0	0
Intercompany expenses									(92,243)	(93,330)	(79,162)
Impairment of inventories									0	0
Depreciation and amortization									0	0	0
General and administrative									0	0	0
Total operating expense									(92,243)	(93,330)	(79,162)
Gain (loss) on disposal of assets									0	0	0
Earnings from unconsolidated affiliates, net of losses									(44,687)	(189,166)	(123,586)
Operating income									(44,687)	(189,166)	(123,586)
Interest expense, net									0	0	0
Extinguishment of debt									0		0
Gain on sale of unconsolidated affiliate, net of losses									0	0
Other income (expense), net									0	0	0
Income before provision for income taxes									(44,687)	(189,166)	(123,586)
Provision for income taxes									0	0	0
Net income									(44,687)	(189,166)	(123,586)
Net income attributable to noncontrolling interests									0	0	0
Net income attributable to Bristow Group									(44,687)	(189,166)	(123,586)
Consolidations, Eliminations [Member] | External Customer [Member]
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue									0	0	0
Consolidations, Eliminations [Member] | Intercompany Customer [Member]
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue									$ (92,243)	$ (93,330)	$ (79,162)