SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION IS (Details) (USD $)	3 Months Ended		9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue	$ 460,140,000	$ 412,335,000	$ 1,408,314,000	$ 1,228,657,000
Direct cost and reimbursable expense	327,779,000	298,267,000	993,116,000	883,346,000
Intercompany expenses	0	0	0	0
Depreciation and amortization	23,625,000	23,655,000	77,164,000	70,332,000
General and administrative	72,531,000	48,948,000	194,687,000	135,735,000
Operating expense	423,935,000	370,870,000	1,264,967,000	1,089,413,000
Gain (loss) on disposal of assets	(26,331,000)	3,982,000	(25,594,000)	(803,000)
Earnings from unconsolidated affiliates, net of losses	(958,000)	(15,945,000)	419,000	1,115,000
Operating income	8,916,000	29,502,000	118,172,000	139,556,000
Interest expense, net	(6,976,000)	(6,846,000)	(21,675,000)	(35,413,000)
Gain on sale of unconsolidated affiliates	3,921,000	0	3,921,000	103,924,000
Other income (expense), net	(5,223,000)	(696,000)	(9,143,000)	(575,000)
Income before provision for income taxes	638,000	21,960,000	91,275,000	207,492,000
Provision for income taxes	(567,000)	(2,946,000)	(18,376,000)	(51,682,000)
Net income	71,000	19,014,000	72,899,000	155,810,000
Net income attributable to noncontrolling interests	(1,039,000)	(87,000)	(3,676,000)	609,000
Net income (loss) attributable to Bristow Group	(968,000)	18,927,000	69,223,000	156,419,000
External Customer [Member]
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue	460,140,000	412,335,000	1,408,314,000	1,228,657,000
Intercompany Customer [Member]
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue	0	0	0	0
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue	840,000	366,000	1,704,000	1,114,000
Direct cost and reimbursable expense	0	0	0	0
Intercompany expenses	0	0	0	0
Depreciation and amortization	(24,000)	698,000	1,254,000	2,151,000
General and administrative	29,395,000	14,307,000	67,573,000	40,440,000
Operating expense	29,371,000	15,005,000	68,827,000	42,591,000
Gain (loss) on disposal of assets	0	(45,000)	0	(45,000)
Earnings from unconsolidated affiliates, net of losses	(1,733,000)	1,733,000	51,251,000	171,641,000
Operating income	(30,264,000)	(12,951,000)	(15,872,000)	130,119,000
Interest expense, net	26,048,000	25,771,000	82,058,000	55,276,000
Gain on sale of unconsolidated affiliates	0		0	0
Other income (expense), net	(625,000)	(38,000)	(2,469,000)	(156,000)
Income before provision for income taxes	(4,841,000)	12,782,000	63,717,000	185,239,000
Provision for income taxes	3,889,000	6,159,000	5,549,000	(28,775,000)
Net income	(952,000)	18,941,000	69,266,000	156,464,000
Net income attributable to noncontrolling interests	(16,000)	(14,000)	(43,000)	(45,000)
Net income (loss) attributable to Bristow Group	(968,000)	18,927,000	69,223,000	156,419,000
Parent Company [Member] | External Customer [Member]
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue	0	0	0	0
Parent Company [Member] | Intercompany Customer [Member]
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue	840,000	366,000	1,704,000	1,114,000
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue	99,105,000	98,549,000	298,470,000	295,582,000
Direct cost and reimbursable expense	58,459,000	57,490,000	168,412,000	172,477,000
Intercompany expenses	0	0	0	0
Depreciation and amortization	9,637,000	10,708,000	31,738,000	32,439,000
General and administrative	8,891,000	9,814,000	26,137,000	25,973,000
Operating expense	76,987,000	78,012,000	226,287,000	230,889,000
Gain (loss) on disposal of assets	4,878,000	1,930,000	7,416,000	391,000
Earnings from unconsolidated affiliates, net of losses	0	0	0	0
Operating income	26,996,000	22,467,000	79,599,000	65,084,000
Interest expense, net	(1,322,000)	(1,810,000)	(3,288,000)	(3,317,000)
Gain on sale of unconsolidated affiliates	0	0	0	0
Other income (expense), net	(660,000)	(182,000)	(563,000)	(342,000)
Income before provision for income taxes	25,014,000	20,475,000	75,748,000	61,425,000
Provision for income taxes	727,000	(418,000)	(34,000)	(2,786,000)
Net income	25,741,000	20,057,000	75,714,000	58,639,000
Net income attributable to noncontrolling interests	0	0	0	0
Net income (loss) attributable to Bristow Group	25,741,000	20,057,000	75,714,000	58,639,000
Guarantor Subsidiaries [Member] | External Customer [Member]
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue	78,026,000	74,092,000	227,378,000	229,253,000
Guarantor Subsidiaries [Member] | Intercompany Customer [Member]
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue	21,079,000	24,457,000	71,092,000	66,329,000
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue	382,114,000	338,243,000	1,180,936,000	999,404,000
Direct cost and reimbursable expense	269,320,000	240,777,000	824,704,000	710,869,000
Intercompany expenses	21,919,000	24,823,000	72,796,000	67,443,000
Depreciation and amortization	14,012,000	12,249,000	44,172,000	35,742,000
General and administrative	34,245,000	24,827,000	100,977,000	69,322,000
Operating expense	339,496,000	302,676,000	1,042,649,000	883,376,000
Gain (loss) on disposal of assets	(31,209,000)	2,097,000	(33,010,000)	(1,149,000)
Earnings from unconsolidated affiliates, net of losses	(1,000,000)	(15,988,000)	377,000	1,072,000
Operating income	10,409,000	21,676,000	105,654,000	115,951,000
Interest expense, net	(31,702,000)	(30,807,000)	(100,445,000)	(87,372,000)
Gain on sale of unconsolidated affiliates	3,921,000	0	3,921,000	103,924,000
Other income (expense), net	(3,938,000)	(476,000)	(6,111,000)	(77,000)
Income before provision for income taxes	(21,310,000)	(9,607,000)	3,019,000	132,426,000
Provision for income taxes	(5,183,000)	(8,687,000)	(23,891,000)	(20,121,000)
Net income	(26,493,000)	(18,294,000)	(20,872,000)	112,305,000
Net income attributable to noncontrolling interests	(1,023,000)	(73,000)	(3,633,000)	654,000
Net income (loss) attributable to Bristow Group	(27,516,000)	(18,367,000)	(24,505,000)	112,959,000
Non-Guarantor Subsidiaries [Member] | External Customer [Member]
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue	382,114,000	338,243,000	1,180,936,000	999,404,000
Non-Guarantor Subsidiaries [Member] | Intercompany Customer [Member]
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue	0	0	0	0
Consolidations, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue	(21,919,000)	(24,823,000)	(72,796,000)	(67,443,000)
Direct cost and reimbursable expense	0	0	0	0
Intercompany expenses	(21,919,000)	(24,823,000)	(72,796,000)	(67,443,000)
Depreciation and amortization	0	0	0	0
General and administrative	0	0	0	0
Operating expense	(21,919,000)	(24,823,000)	(72,796,000)	(67,443,000)
Gain (loss) on disposal of assets	0	0	0	0
Earnings from unconsolidated affiliates, net of losses	1,775,000	(1,690,000)	(51,209,000)	(171,598,000)
Operating income	1,775,000	(1,690,000)	(51,209,000)	(171,598,000)
Interest expense, net	0	0	0	0
Gain on sale of unconsolidated affiliates	0	0	0	0
Other income (expense), net	0	0	0	0
Income before provision for income taxes	1,775,000	(1,690,000)	(51,209,000)	(171,598,000)
Provision for income taxes	0	0	0	0
Net income	1,775,000	(1,690,000)	(51,209,000)	(171,598,000)
Net income attributable to noncontrolling interests	0	0	0	0
Net income (loss) attributable to Bristow Group	1,775,000	(1,690,000)	(51,209,000)	(171,598,000)
Consolidations, Eliminations [Member] | External Customer [Member]
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue	0	0	0	0
Consolidations, Eliminations [Member] | Intercompany Customer [Member]
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue	$ (21,919,000)	$ (24,823,000)	$ (72,796,000)	$ (67,443,000)