SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION IS (Details) (USD $)	3 Months Ended								12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Condensed Financial Statements, Captions [Line Items]
Intercompany revenue									$ 0	$ 0	$ 0
Total consolidated gross revenue	391,642,000	388,469,000	365,754,000	362,608,000	358,371,000	331,335,000	330,992,000	321,105,000	1,508,473,000	1,341,803,000	1,232,808,000
Direct cost and reimbursable expense									1,057,794,000	947,650,000	862,341,000
Intercompany expenses									0	0	0
Impairment of inventories									0	25,919,000	0
Depreciation and amortization									96,284,000	96,144,000	89,377,000
General and administrative									163,389,000	135,333,000	120,145,000
Total operating expense									1,317,467,000	1,205,046,000	1,071,863,000
Gain (loss) on disposal of assets									8,068,000	(31,670,000)	8,678,000
Earnings from unconsolidated affiliates, net of losses									25,070,000	10,679,000	20,101,000
Operating income	62,703,000	74,120,000	47,328,000	39,993,000	26,213,000	43,553,000	9,595,000	36,405,000	224,144,000	115,766,000	189,724,000
Interest income									788,000	560,000	1,092,000
Interest expense									(42,446,000)	(38,130,000)	(46,187,000)
Extinguishment of debt									14,932,000	0	2,300,000
Other income (expense), net									(877,000)	1,246,000	(1,930,000)
Income before provision for income taxes									166,677,000	79,442,000	140,399,000
Provision for income taxes									(35,002,000)	(14,201,000)	(7,104,000)
Net income									131,675,000	65,241,000	133,295,000
Net income attributable to noncontrolling interests									(1,573,000)	(1,711,000)	(980,000)
Net income attributable to Bristow Group	40,380,000	36,392,000	29,668,000	23,662,000	14,242,000	25,532,000	2,711,000	21,045,000	130,102,000	63,530,000	132,315,000
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Gross revenue									0	0	0
Intercompany revenue									12,537,000	4,981,000	1,360,000
Total consolidated gross revenue									12,537,000	4,981,000	1,360,000
Direct cost and reimbursable expense									0	0	(1,934,000)
Intercompany expenses									0	0	0
Impairment of inventories										0
Depreciation and amortization									4,588,000	3,687,000	7,654,000
General and administrative									52,968,000	39,747,000	34,389,000
Total operating expense									57,556,000	43,434,000	40,109,000
Gain (loss) on disposal of assets									0	(6,000)	0
Earnings from unconsolidated affiliates, net of losses									123,586,000	43,626,000	125,770,000
Operating income									78,567,000	5,167,000	87,021,000
Interest income									115,276,000	96,792,000	83,488,000
Interest expense									(44,844,000)	(37,856,000)	(45,123,000)
Extinguishment of debt									14,932,000		2,300,000
Other income (expense), net									94,000	25,000	(2,539,000)
Income before provision for income taxes									134,161,000	64,128,000	120,547,000
Provision for income taxes									(3,996,000)	(533,000)	11,827,000
Net income									130,165,000	63,595,000	132,374,000
Net income attributable to noncontrolling interests									(63,000)	(65,000)	(59,000)
Net income attributable to Bristow Group									130,102,000	63,530,000	132,315,000
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Gross revenue									300,731,000	258,525,000	284,866,000
Intercompany revenue									66,625,000	59,708,000	46,200,000
Total consolidated gross revenue									367,356,000	318,233,000	331,066,000
Direct cost and reimbursable expense									208,995,000	184,258,000	199,867,000
Intercompany expenses									0	0	0
Impairment of inventories										9,212,000
Depreciation and amortization									38,851,000	36,185,000	31,974,000
General and administrative									29,252,000	20,595,000	21,896,000
Total operating expense									277,098,000	250,250,000	253,737,000
Gain (loss) on disposal of assets									2,474,000	1,705,000	7,350,000
Earnings from unconsolidated affiliates, net of losses									0	0	0
Operating income									92,732,000	69,688,000	84,679,000
Interest income									17,000	200,000	611,000
Interest expense									0	0	(136,000)
Extinguishment of debt									0		0
Other income (expense), net									103,000	100,000	146,000
Income before provision for income taxes									92,852,000	69,988,000	85,300,000
Provision for income taxes									(6,070,000)	(7,887,000)	(9,846,000)
Net income									86,782,000	62,101,000	75,454,000
Net income attributable to noncontrolling interests									0	0	0
Net income attributable to Bristow Group									86,782,000	62,101,000	75,454,000
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Gross revenue									1,207,742,000	1,083,278,000	947,942,000
Intercompany revenue									0	0	0
Total consolidated gross revenue									1,207,742,000	1,083,278,000	947,942,000
Direct cost and reimbursable expense									848,799,000	763,392,000	664,408,000
Intercompany expenses									79,162,000	64,689,000	47,560,000
Impairment of inventories										16,707,000
Depreciation and amortization									52,845,000	56,272,000	49,749,000
General and administrative									81,169,000	74,991,000	63,860,000
Total operating expense									1,061,975,000	976,051,000	825,577,000
Gain (loss) on disposal of assets									5,594,000	(33,369,000)	1,328,000
Earnings from unconsolidated affiliates, net of losses									25,070,000	8,679,000	18,433,000
Operating income									176,431,000	82,537,000	142,126,000
Interest income									704,000	517,000	795,000
Interest expense									(112,811,000)	(97,223,000)	(84,730,000)
Extinguishment of debt									0		0
Other income (expense), net									(1,074,000)	1,121,000	463,000
Income before provision for income taxes									63,250,000	(13,048,000)	58,654,000
Provision for income taxes									(24,936,000)	(5,781,000)	(9,085,000)
Net income									38,314,000	(18,829,000)	49,569,000
Net income attributable to noncontrolling interests									(1,510,000)	(1,646,000)	(921,000)
Net income attributable to Bristow Group									36,804,000	(20,475,000)	48,648,000
Consolidations, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Gross revenue									0	0	0
Intercompany revenue									(79,162,000)	(64,689,000)	(47,560,000)
Total consolidated gross revenue									(79,162,000)	(64,689,000)	(47,560,000)
Direct cost and reimbursable expense									0	0	0
Intercompany expenses									(79,162,000)	(64,689,000)	(47,560,000)
Impairment of inventories										0
Depreciation and amortization									0	0	0
General and administrative									0	0	0
Total operating expense									(79,162,000)	(64,689,000)	(47,560,000)
Gain (loss) on disposal of assets									0	0	0
Earnings from unconsolidated affiliates, net of losses									(123,586,000)	(41,626,000)	(124,102,000)
Operating income									(123,586,000)	(41,626,000)	(124,102,000)
Interest income									(115,209,000)	(96,949,000)	(83,802,000)
Interest expense									115,209,000	96,949,000	83,802,000
Extinguishment of debt									0		0
Other income (expense), net									0	0	0
Income before provision for income taxes									(123,586,000)	(41,626,000)	(124,102,000)
Provision for income taxes									0	0	0
Net income									(123,586,000)	(41,626,000)	(124,102,000)
Net income attributable to noncontrolling interests									0	0	0
Net income attributable to Bristow Group									$ (123,586,000)	$ (41,626,000)	$ (124,102,000)