COMMITMENTS AND CONTINGENCIES (Details) (USD $)	3 Months Ended								12 Months Ended								12 Months Ended								12 Months Ended				3 Months Ended	12 Months Ended		3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2014 Damage from Fire, Explosion or Other Hazard [Member]	Mar. 31, 2014 Aircraft Operating Lease [Member]	Mar. 31, 2013 Aircraft Operating Lease [Member]	Mar. 31, 2012 Aircraft Operating Lease [Member]	Mar. 31, 2014 Other Operating Lease [Member]	Mar. 31, 2014 Fiscal Year 2015 To Fiscal Year 2016 [Member]	Mar. 31, 2014 Fiscal Year 2017 To Fiscal Year 2019 [Member]	Mar. 31, 2014 Fiscal Year 2020 To Fiscal Year 2024 [Member]	Mar. 31, 2014 Medium Aircraft [Member]	Mar. 31, 2014 Large Aircraft [Member]	Mar. 31, 2014 U.K. SAR [Member]	Mar. 31, 2014 Medium And Large [Member]	Mar. 31, 2014 Other Purchase Commitments [Member]	Mar. 31, 2014 EC225 Affected Aircraft [Member]	Mar. 31, 2013 EC225 Affected Aircraft [Member]	Mar. 31, 2014 U.K. EC225 Affected Aircraft [Member]	Mar. 31, 2013 U.K. EC225 Affected Aircraft [Member]	Jun. 30, 2014 U.K. EC225 Affected Aircraft [Member] Subsequent Event [Member]	Mar. 31, 2014 NORWAY EC225 Affected Aircraft [Member]	Mar. 31, 2014 AUSTRALIA EC225 Affected Aircraft [Member]	Jun. 30, 2014 AUSTRALIA EC225 Affected Aircraft [Member] Subsequent Event [Member]	Mar. 31, 2014 Alaska [Member]	Mar. 31, 2014 Southern North Sea [Member]	Mar. 31, 2013 Southern North Sea [Member]	Mar. 31, 2014 Commitments [Member]	Mar. 31, 2013 Commitments [Member]	Mar. 31, 2012 Commitments [Member]	Mar. 31, 2014 Options [Member]	Mar. 31, 2013 Options [Member]	Mar. 31, 2012 Options [Member]	Mar. 31, 2014 Year One [Member]	Mar. 31, 2014 Year One [Member] Medium Aircraft [Member]	Mar. 31, 2014 Year One [Member] Large Aircraft [Member]	Mar. 31, 2014 Year One [Member] U.K. SAR [Member]	Mar. 31, 2014 Year One [Member] Medium And Large [Member]	Mar. 31, 2014 Year Two [Member]	Mar. 31, 2014 Year Two [Member] Medium Aircraft [Member]	Mar. 31, 2014 Year Two [Member] Large Aircraft [Member]	Mar. 31, 2014 Year Two [Member] U.K. SAR [Member]	Mar. 31, 2014 Year Two [Member] Medium And Large [Member]	Mar. 31, 2014 Year Three [Member]	Mar. 31, 2014 Year Three [Member] Medium Aircraft [Member]	Mar. 31, 2014 Year Three [Member] Large Aircraft [Member]	Mar. 31, 2014 Year Three [Member] U.K. SAR [Member]	Mar. 31, 2014 Year Three [Member] Medium And Large [Member]	Mar. 31, 2014 Year Four and Thereafter [Member]	Mar. 31, 2014 Year Four and Thereafter [Member] Medium Aircraft [Member]	Mar. 31, 2014 Year Four and Thereafter [Member] Large Aircraft [Member]	Mar. 31, 2014 Year Four and Thereafter [Member] U.K. SAR [Member]	Mar. 31, 2014 Year Four and Thereafter [Member] Medium And Large [Member]
Aircraft Purchase Contracts [Line Items]
Purchase Commitments - Total	$ 707,477,000								$ 707,477,000													$ 206,394,000	$ 501,083,000	$ 55,000,000																		$ 480,459,000			$ 106,704,000	$ 373,755,000	$ 189,431,000			$ 99,690,000	$ 89,741,000	$ 37,587,000			$ 0	$ 37,587,000	$ 0			$ 0	$ 0
Purchase Options - Total	1,124,119,000								1,124,119,000																																	88,831,000					350,145,000					422,100,000					263,043,000
Work force reductions costs																																	2,900,000	2,100,000	2,200,000
Analysis Of Aircraft Orders And Options [Line Items]
Beginning of period																																				45	15	6	70	40	31
Aircraft delivered																																				(21)	(8)	(9)	0	0	0
Aircraft ordered																																				18	26	13	0	0	0
New options																																				0	0	0	0	42	31
Exercised options																																				8	12	7	(8)	(12)	(7)
Expired options																																				0	0	0	(7)	0	(15)
Orders transferred																																				(7)	0	(2)	0	0	0
End of period																																				43	45	15	55	70	40
Number Of Aircraft Purchase Commitments	43								43											10	22	11																				28	10	13	5		12	0	6	6		3	0	3	0		0	0	0	0
Number Of Aircraft Options	55								55											21	34																					0	0	0			15	7	8			21	7	14			19	7	12
Number of signed client contracts	19								19
Number of Aircraft Orders Subject To Successful Development	5								5
Number Of Aircraft Under Option Subject To Successful Development	7								7
Number of aircraft suspend operations																										16		11
Number of aircraft																									20
Number of aircraft owned																									14
Number Of Leased Aircraft																									6
Number of aircraft returned to service																											9			3	5
Number of aircraft expected to return to service																													2			1
Sale Leaseback Transaction [Line Items]
Operating leases rental expense									105,800,000	67,400,000	46,000,000		83,500,000	46,800,000	27,900,000
Operating Leases, Future Minimum Payments Due, Current	104,278,000								104,278,000				94,796,000			9,482,000
Operating Leases, Future Minimum Payments, Due in Two Years	95,648,000								95,648,000				87,937,000			7,711,000
Operating Leases, Future Minimum Payments, Due in Three Years	90,047,000								90,047,000				83,372,000			6,675,000
Operating Leases, Future Minimum Payments, Due in Four Years	71,667,000								71,667,000				66,071,000			5,596,000
Operating Leases, Future Minimum Payments, Due in Five Years	49,492,000								49,492,000				44,149,000			5,343,000
Operating Leases, Future Minimum Payments, Due Thereafter	84,275,000								84,275,000				44,376,000			39,899,000
Operating Leases, Future Minimum Payments Due	495,407,000								495,407,000				420,701,000			74,706,000
Number of aircraft sale leaseback									14	11	9
Proceeds from assignment of aircraft purchase agreements									106,113,000	0	0
Number Of Aircraft Assigned Future Payments									7
Sale price of the aircraft leaseback									246,400,000	255,800,000	171,200,000
Sale Leaseback Progress Payments											23,400,000
Sale Leaseback Progress Payments Number Of Aircraft											2
Number of operating lease									61								9	26	26
Monthly Rent payment									8,038,000								1,023,000	4,264,000	2,751,000
Lease term of the aircraft									The aircraft leases range from base terms of five to 84 months with renewal options of up to 108 months in some cases, include purchase options upon expiration and some include early purchase options.
Insurance Recoveries										4,700,000		11,100,000
Collective Bargaining Agreements and/or Unions	52.00%								52.00%
Employee Agreement Escalation Rate									up to 12%
Officer Compensation Expense									2,900,000	2,000,000	2,300,000
Possible litigation damages from early termination of agreement									The claimants allege that an agreement between the parties was terminated without justification and seek damages of $16.3 million. We responded to this claim in early 2006. There has been minimal activity on this claim since then.
Impairment of inventories									12,669,000	0	25,919,000
Gain (loss) on disposal of assets	$ 100,000	$ 4,000,000	$ (3,100,000)	$ (1,700,000)	$ 7,200,000	$ 7,400,000	$ (1,300,000)	$ (5,300,000)	$ (722,000)	$ 8,068,000	$ (31,670,000)	$ (11,100,000)