SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION IS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Gross revenue		$ 365,754	$ 330,992	$ 728,362	$ 652,097
Intercompany revenue		0	0	0	0
Total consolidated gross revenue		365,754	330,992	728,362	652,097
Direct cost and reimbursable expense		263,129	236,405	526,069	466,161
Intercompany expenses		0	0	0	0
Impairment of inventories	0		24,610	0	24,610
Depreciation and amortization		23,321	25,431	44,693	48,139
General and administrative		37,708	29,303	72,685	68,948
Total operating expense		324,158	315,749	643,447	607,858
Gain (loss) on disposal of assets		(1,262)	(1,611)	(6,577)	(195)
Earnings from unconsolidated affiliates, net of losses		6,994	(4,037)	8,983	1,956
Operating income		47,328	9,595	87,321	46,000
Interest income		263	153	351	324
Interest expense		(8,597)	(9,459)	(17,371)	(18,414)
Other income (expense), net		(218)	727	(1,149)	931
Income before provision for income taxes		38,776	1,016	69,152	28,841
Provision for income taxes		(8,342)	1,945	(14,522)	(4,661)
Net income		30,434	2,961	54,630	24,180
Net income attributable to noncontrolling interests		(766)	(250)	(1,300)	(424)
Net income attributable to Bristow Group		29,668	2,711	53,330	23,756
Parent Company [Member]
Gross revenue		0	0	0	0
Intercompany revenue		578	1,555	1,156	1,555
Total consolidated gross revenue		578	1,555	1,156	1,555
Direct cost and reimbursable expense		0	730	0	0
Intercompany expenses		0	0	0	0
Impairment of inventories			0		0
Depreciation and amortization		1,091	916	2,160	1,759
General and administrative		11,218	7,626	20,147	21,801
Total operating expense		12,309	9,272	22,307	23,560
Gain (loss) on disposal of assets		0	0	0	0
Earnings from unconsolidated affiliates, net of losses		21,076	(7,074)	38,815	15,145
Operating income		9,345	(14,791)	17,664	(6,860)
Interest income		28,988	24,286	56,928	47,589
Interest expense		(9,171)	(9,538)	(18,021)	(18,797)
Other income (expense), net		(57)	47	(6)	61
Income before provision for income taxes		29,105	4	56,565	21,993
Provision for income taxes		579	2,722	(3,200)	1,793
Net income		29,684	2,726	53,365	23,786
Net income attributable to noncontrolling interests		(16)	(15)	(35)	(30)
Net income attributable to Bristow Group		29,668	2,711	53,330	23,756
Guarantor Subsidiaries [Member]
Gross revenue		76,217	69,152	145,729	136,349
Intercompany revenue		18,532	12,106	35,831	23,879
Total consolidated gross revenue		94,749	81,258	181,560	160,228
Direct cost and reimbursable expense		56,342	40,743	106,114	83,704
Intercompany expenses		0	0	0	0
Impairment of inventories			8,778		8,778
Depreciation and amortization		9,348	10,904	17,423	19,086
General and administrative		7,361	4,596	14,212	11,359
Total operating expense		73,051	65,021	137,749	122,927
Gain (loss) on disposal of assets		421	(427)	(998)	(247)
Earnings from unconsolidated affiliates, net of losses		0	0	0	0
Operating income		22,119	15,810	42,813	37,054
Interest income		8	10	17	180
Interest expense		0	0	0	0
Other income (expense), net		(36)	126	21	192
Income before provision for income taxes		22,091	15,946	42,851	37,426
Provision for income taxes		(2,024)	(2,483)	(3,782)	(5,146)
Net income		20,067	13,463	39,069	32,280
Net income attributable to noncontrolling interests		0	0	0	0
Net income attributable to Bristow Group		20,067	13,463	39,069	32,280
Non-Guarantor Subsidiaries [Member]
Gross revenue		289,537	261,840	582,633	515,748
Intercompany revenue		0	0	0	0
Total consolidated gross revenue		289,537	261,840	582,633	515,748
Direct cost and reimbursable expense		206,787	194,932	419,955	382,457
Intercompany expenses		19,110	13,661	36,987	25,434
Impairment of inventories			15,832		15,832
Depreciation and amortization		12,882	13,611	25,110	27,294
General and administrative		19,129	17,081	38,326	35,788
Total operating expense		257,908	255,117	520,378	486,805
Gain (loss) on disposal of assets		(1,683)	(1,184)	(5,579)	52
Earnings from unconsolidated affiliates, net of losses		6,994	(4,037)	8,983	1,956
Operating income		36,940	1,502	65,659	30,951
Interest income		296	139	296	301
Interest expense		(28,455)	(24,203)	(56,240)	(47,363)
Other income (expense), net		(125)	554	(1,164)	678
Income before provision for income taxes		8,656	(22,008)	8,551	(15,433)
Provision for income taxes		(6,897)	1,706	(7,540)	(1,308)
Net income		1,759	(20,302)	1,011	(16,741)
Net income attributable to noncontrolling interests		(750)	(235)	(1,265)	(394)
Net income attributable to Bristow Group		1,009	(20,537)	(254)	(17,135)
Consolidations, Eliminations [Member]
Gross revenue		0	0	0	0
Intercompany revenue		(19,110)	(13,661)	(36,987)	(25,434)
Total consolidated gross revenue		(19,110)	(13,661)	(36,987)	(25,434)
Direct cost and reimbursable expense		0	0	0	0
Intercompany expenses		(19,110)	(13,661)	(36,987)	(25,434)
Impairment of inventories			0		0
Depreciation and amortization		0	0	0	0
General and administrative		0	0	0	0
Total operating expense		(19,110)	(13,661)	(36,987)	(25,434)
Gain (loss) on disposal of assets		0	0	0	0
Earnings from unconsolidated affiliates, net of losses		(21,076)	7,074	(38,815)	(15,145)
Operating income		(21,076)	7,074	(38,815)	(15,145)
Interest income		(29,029)	(24,282)	(56,890)	(47,746)
Interest expense		29,029	24,282	56,890	47,746
Other income (expense), net		0	0	0	0
Income before provision for income taxes		(21,076)	7,074	(38,815)	(15,145)
Provision for income taxes		0	0	0	0
Net income		(21,076)	7,074	(38,815)	(15,145)
Net income attributable to noncontrolling interests		0	0	0	0
Net income attributable to Bristow Group		$ (21,076)	$ 7,074	$ (38,815)	$ (15,145)