VARIABLE INTEREST ENTITIES AND OTHER INVESTMENTS IN SIGNIFICANT AFFILIATES (Details)	3 Months Ended								12 Months Ended				12 Months Ended			0 Months Ended	3 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended										12 Months Ended		1 Months Ended	12 Months Ended						12 Months Ended										1 Months Ended	3 Months Ended	8 Months Ended	12 Months Ended							12 Months Ended			1 Months Ended	12 Months Ended
	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Sep. 30, 2013 USD ($)	Jun. 30, 2013 USD ($)	Mar. 31, 2015 USD ($) Affiliates aircraft	Mar. 31, 2014 USD ($)	Mar. 31, 2013 USD ($)	Mar. 31, 2012 USD ($)	Mar. 31, 2015 Caledonia Investments Plc [Member]	Mar. 31, 2015 European Union [Member]	Mar. 31, 2015 Unrelated Local Nigerian Partners [Member]	Jul. 31, 2014 Nigerian Company owned by 100% Nigerian Employees [Member]	Dec. 31, 2013 Nigerian Company owned by 100% Nigerian Employees [Member]	Mar. 31, 2015 Nigerian Company owned by 100% Nigerian Employees [Member]	Apr. 30, 2015 Nigerian Company owned by 100% Nigerian Employees [Member] Subsequent Event [Member]	Mar. 31, 2015 Employee Trust Fund [Member]	Mar. 31, 2015 Bristow Aviation Holdings Limited [Member] USD ($) Class_Of_Shares	Mar. 31, 2014 Bristow Aviation Holdings Limited [Member] USD ($)	Mar. 31, 2013 Bristow Aviation Holdings Limited [Member] USD ($)	Mar. 31, 2015 Bristow Aviation Holdings Limited [Member] GBP (£)	May 31, 2004 Bristow Aviation Holdings Limited [Member] USD ($)	May 31, 2004 Bristow Aviation Holdings Limited [Member] GBP (£)	Apr. 30, 2004 Bristow Aviation Holdings Limited [Member]	Mar. 31, 2015 Bristow Aviation Holdings Limited [Member] Director One [Member] voting_rights	Mar. 31, 2015 Bristow Aviation Holdings Limited [Member] Director Two [Member] voting_rights	Mar. 31, 2015 Bristow Aviation Holdings Limited [Member] Caledonia Investments Plc [Member] Nominations voting_rights	Mar. 31, 2015 Bristow Helicopters Nigeria Ltd [Member]	Apr. 30, 2015 Bristow Helicopters Nigeria Ltd [Member] Subsequent Event [Member]	Mar. 31, 2015 Pan African Airlines Nigeria Ltd [Member]	Mar. 31, 2015 Aviashelf Aviation Co. [Member]	Mar. 31, 2015 Bristow Helicopter Leasing [Member]	Mar. 31, 2015 Sakhalin Bristow Air Services [Member]	Mar. 31, 2015 Petroleum Air Services [Member] USD ($) aircraft	Mar. 31, 2014 Petroleum Air Services [Member] USD ($)	Mar. 31, 2015 FB Entities [Member] USD ($)	Mar. 31, 2014 FB Entities [Member] USD ($)	Mar. 31, 2014 FB Entities [Member] GBP (£)	Mar. 31, 2013 FB Entities [Member] USD ($) Extensions	Mar. 31, 2015 Lider [Member] USD ($) aircraft	Mar. 31, 2014 Lider [Member] USD ($)	Mar. 31, 2013 Lider [Member] USD ($)	Mar. 31, 2015 Lider [Member] Omitted Comprehensive Income From Equity Investment [Member] Investments in unconsolidated affiliates [Member] USD ($)	Mar. 31, 2015 Lider [Member] Omitted Comprehensive Income From Equity Investment [Member] Deferred tax asset [Member] USD ($)	Mar. 31, 2015 Lider [Member] Omitted Comprehensive Income From Equity Investment [Member] Accumulated other comprehensive income (loss) [Member] USD ($)	Dec. 31, 2013 Lider [Member] Tax amnesty [Member] USD ($)	Mar. 31, 2014 Lider [Member] Tax amnesty [Member] USD ($)	Nov. 30, 2013 Lider [Member] Tax amnesty [Member] USD ($)	Mar. 31, 2014 Lider [Member] Tax amnesty [Member] USD ($)	Mar. 31, 2014 Lider [Member] Tax amnesty [Member] BRL	Mar. 31, 2015 Lider [Member] Aircraft [Member] aircraft	Mar. 31, 2015 Lider [Member] Fixed Wing Aircraft [Member] aircraft	Mar. 31, 2015 Helideck Certification Agency [Member] USD ($)	Mar. 31, 2015 Helideck Certification Agency [Member] GBP (£)	Mar. 31, 2014 Helideck Certification Agency [Member]	Mar. 31, 2015 Cougar [Member] USD ($)	Mar. 31, 2014 Cougar [Member] USD ($)	Mar. 31, 2013 Cougar [Member] USD ($)	Apr. 30, 2015 Cougar [Member] Subsequent Event [Member] USD ($)	Mar. 31, 2015 Other Unconsolidated Significant Affiliates [Member] USD ($)	Mar. 31, 2014 Other Unconsolidated Significant Affiliates [Member] USD ($)	Mar. 31, 2013 Other Unconsolidated Significant Affiliates [Member] USD ($)
Variable Interest Entity [Line Items]
Number of variable interest entities									4
Ownership percentage in Variable Interest Entity																					49.00%	49.00%									40.00%		50.17%	48.50%	51.00%	51.00%
Class Of Shares, Number																					3
Ownership Percentage in Variable Interest Entity, Third Party													46.00%	5.00%	10.00%			48.00%		2.00%	51.00%
Number Of Voting Rights																												1	1	3
Number of Board Of Directors Nomination																														2
Variable Interest Entity, Qualitative or Quantitative Information, Purchased Percentage From Third Party																29.00%	19.00%		2.00%													8.00%
Purchase of deferred stock shares																									8,000,000	8,000,000
Business Acquisition, Share Price																										£ 1
Total amount paid for deferred shares																									$ 14,400,000
Principal amount of subordinated unsecured loan stock																					135,100,000			91,000,000
Interest rate on unsecured loan																					13.50%
Deferred interest cost																					1,500,000,000
Call option price held by noncontrolling interest																								1,000,000
Call Option Guaranteed Rate																					3.00%				12.00%	12.00%
Put Option Guaranteed Rate																											10.00%
Number Of Joint Ventures									2
Option to acquire additional interest in affiliate																																		8.50%
Noncontrolling Interest [Abstract]
Noncontrolling interests- beginning balance				8,651,000					8,651,000												1,645,000	1,492,000	1,577,000
Payments to non-controlling interest shareholders									(59,000)	(57,000)	(63,000)										(59,000)	(57,000)	(63,000)
Net income attributable to noncontrolling interests									4,407,000	1,042,000	1,573,000										58,000	57,000	60,000
Currency translation adjustments									(71,617,000)	18,729,000	(11,982,000)										(187,000)	153,000	(82,000)
Noncontrolling interests- ending balance	7,256,000				8,651,000				7,256,000	8,651,000											1,457,000	1,645,000	1,492,000
VIE Financial Information
Cash and cash equivalents	104,146,000				204,341,000				104,146,000	204,341,000	215,623,000	261,550,000									91,190,000	173,490,000
Accounts Receivable Net Current	258,618,000				297,443,000				258,618,000	297,443,000											521,989,000	311,641,000
Inventories	147,169,000				137,463,000				147,169,000	137,463,000											100,065,000	94,288,000
Prepaid expenses and other current assets	70,091,000				53,084,000				70,091,000	53,084,000											42,659,000	45,791,000
Total current assets	637,851,000				721,607,000				637,851,000	721,607,000											755,903,000	625,210,000
Investment in unconsolidated affiliates	216,376,000				262,615,000				216,376,000	262,615,000											64,000	1,414,000															6,286,000	6,286,000					149,010,000	193,345,000															61,015,000	61,570,000			65,000	1,414,000
Total property and equipment, net	2,157,101,000				2,268,751,000				2,157,101,000	2,268,751,000											243,357,000	217,969,000
Goodwill	75,628,000				56,680,000				75,628,000	56,680,000	28,897,000										61,242,000	41,218,000
Other assets	143,764,000				88,604,000				143,764,000	88,604,000											78,637,000	45,477,000
Total assets	3,230,720,000				3,398,257,000				3,230,720,000	3,398,257,000											1,139,203,000	931,288,000
Accounts payable current	84,193,000				89,818,000				84,193,000	89,818,000											379,357,000	182,892,000
Accrued Liabilities Current	258,445,000				204,498,000				258,445,000	204,498,000											154,306,000	113,820,000
Accrued interest	12,831,000				16,157,000				12,831,000	16,157,000											1,489,369,000	1,291,581,000
Deferred Tax Liabilities Current	17,704,000				12,372,000				17,704,000	12,372,000											1,128,000	3,588,000
Short-term borrowings and current maturities of long-term debt	18,730,000				14,207,000				18,730,000	14,207,000											9,643,000	9,664,000
Total current liabilities	435,006,000				457,825,000				435,006,000	457,825,000											2,033,803,000	1,601,545,000
Total long-term debt	845,692,000				827,095,000				845,692,000	827,095,000											168,245,000	172,391,000
Accrued pension liabilities	99,576,000				86,823,000				99,576,000	86,823,000											99,576,000	86,824,000
Other liabilities and deferred credits	39,782,000				78,126,000				39,782,000	78,126,000											11,948,000	2,252,000
Deferred taxes	165,655,000				169,519,000				165,655,000	169,519,000											14,457,000	13,062,000
Temporary equity	26,223,000				22,283,000				26,223,000	22,283,000											26,223,000	22,283,000
Total Liabilities																					2,354,252,000	1,898,357,000
Revenues	450,355,000	460,140,000	475,636,000	472,538,000	440,925,000	412,335,000	417,328,000	398,994,000	1,858,669,000	1,669,582,000	1,508,473,000										1,512,312,000	1,324,483,000	1,161,988,000
Operating income (loss)																					40,524,000	49,061,000	58,587,000
Net loss									88,707,000	187,779,000	131,675,000										(179,757,000)	(38,274,000)	(115,281,000)
Unconsolidated affiliates [Abstract]
Business acquisition equity interests issued or issuable number of shares issued																																																													40
Acquisition cost																																																													250,000,000
Purchase price of interest in Equity Method investment previously paid																																																													23,800,000
Net cash of outlay of equity method investment																																																													226,200,000
Payments for contingent consideration									0	6,000,000	0																																																	6,000,000		8,000,000
Business acquisition, percentage of voting interests acquired																																											20.00%	20.00%															25.00%	25.00%	25.00%
Equity investment ownership percentage																																					25.00%	25.00%				50.00%	41.90%	42.50%														50.00%	40.00%	40.00%	40.00%
Purchase price and transaction cost of equity method investment																																																													257,800,000
Proceeds from sale of unconsolidated affiliates									4,185,000	112,210,000	0																													112,200,000	74,000,000															4,200,000	2,700,000
Business acquisition transaction costs																																																													7,800,000
Potential earn-out payments	0				0				0	0	34,245,000																																																		40,000,000
Potential earn-out payment period																																																													3
Fair value of earn-out	38,905,000				31,322,000				38,905,000	31,322,000																																																	32,500,000	31,300,000
Number of aircraft operated									501																																													59	26
Number of aircraft owned																																					45
Number of aircraft leased from affiliates																																											8
Reporting Of Unconsolidated Affiliate Earnings, Time Difference																																																											3 months
Number Of Renewal Extensions																																										2
Renewal Extension Term																																										1 year
Income Taxes Paid									34,800,000	59,100,000	24,100,000																																									27,000,000	62,700,000
Tax Adjustments, Settlements, and Unusual Provisions																																																				40,200,000	93,300,000
Reduction In Tax Assessment																																																				13,200,000	30,600,000
Quantifying Misstatement in Current Year Financial Statements, Amount																																														(36,400,000)	12,700,000	(23,600,000)
Cost Method Investment Dividends Or Distributions									2,068,000	4,043,000	28,000
Income (Loss) from Equity Method Investments									(3,839,000)	8,666,000	25,042,000																												0	3,217,000		10,517,000	(4,236,000)	2,898,000	14,762,000				(2,200,000)	1,700,000	(17,100,000)	(13,600,000)							(710,000)	1,053,000	(736,000)		1,107,000	1,498,000	499,000
Earnings from unconsolidated affiliates, net of losses									(1,771,000)	12,709,000	25,070,000
Dividends from Equity Method Investments									5,600,000	10,300,000	16,200,000
Investment in unconsolidated affiliates	216,376,000				262,615,000				216,376,000	262,615,000											64,000	1,414,000															6,286,000	6,286,000					149,010,000	193,345,000															61,015,000	61,570,000			65,000	1,414,000
Gain on sale of unconsolidated affiliates									3,921,000	103,924,000	0																													103,900,000																3,900,000
Proceed from indemnity due to tax assessment																																																		2,500,000
Summary of Combined Financial Information Equity Method Investments [Abstract]
Current Assets	200,979,000				216,345,000				200,979,000	216,345,000
Non-current Assets	384,438,000				440,470,000				384,438,000	440,470,000
Total assets	585,417,000				656,815,000				585,417,000	656,815,000
Current Liabilities	189,251,000				171,604,000				189,251,000	171,604,000
Non-current Liabilities	255,318,000				274,907,000				255,318,000	274,907,000
Equity	140,848,000				210,304,000				140,848,000	210,304,000
Total liabilities and equity	585,417,000				656,815,000				585,417,000	656,815,000
Revenue									499,692,000	632,832,000	578,175,000
Gross profit									99,127,000	132,760,000	126,007,000
Net loss									559,000	21,728,000	57,712,000
Equity Method Investment Realized Gain Loss On Disposal Net Of Tax									$ 67,900,000