COMMITMENTS AND CONTINGENCIES (Details) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended	3 Months Ended			6 Months Ended		3 Months Ended		6 Months Ended				3 Months Ended		6 Months Ended			3 Months Ended																																6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Alaska [Member]	Sep. 30, 2013 Alaska [Member]	Sep. 30, 2013 Unionized Employees Concentration Risk [Member]	Sep. 30, 2013 Medium Aircraft [Member]	Sep. 30, 2012 Medium Aircraft [Member]	Sep. 30, 2013 Medium Aircraft [Member]	Sep. 30, 2012 Medium Aircraft [Member]	Sep. 30, 2013 Large Aircraft [Member]	Sep. 30, 2012 Large Aircraft [Member]	Sep. 30, 2013 Large Aircraft [Member]	Sep. 30, 2012 Large Aircraft [Member]	Sep. 30, 2013 Medium and Large [Member]	Sep. 30, 2013 SAR Configured [Member]	Sep. 30, 2013 Aircraft [Member]	Sep. 30, 2012 Aircraft [Member]	Sep. 30, 2013 Aircraft [Member]	Sep. 30, 2012 Aircraft [Member]	Sep. 30, 2013 S92 Aircraft [Member]	Sep. 30, 2013 United Kingdom Location [Member]	Sep. 30, 2013 Norway Location [Member]	Sep. 30, 2013 Australia Location [Member]	Sep. 30, 2013 Commitments [Member]	Jun. 30, 2013 Commitments [Member]	Sep. 30, 2013 Options [Member]	Jun. 30, 2013 Options [Member]	Sep. 30, 2013 Remainder of Year 2014 [Member]	Sep. 30, 2013 Remainder of Year 2014 [Member] Medium Aircraft [Member]	Sep. 30, 2013 Remainder of Year 2014 [Member] Large Aircraft [Member]	Sep. 30, 2013 Remainder of Year 2014 [Member] Medium and Large [Member]	Sep. 30, 2013 Remainder of Year 2014 [Member] SAR Configured [Member]	Sep. 30, 2013 Year 2015 [Member]	Sep. 30, 2013 Year 2015 [Member] Medium Aircraft [Member]	Sep. 30, 2013 Year 2015 [Member] Large Aircraft [Member]	Sep. 30, 2013 Year 2015 [Member] Medium and Large [Member]	Sep. 30, 2013 Year 2015 [Member] SAR Configured [Member]	Sep. 30, 2013 Year 2016 [Member]	Sep. 30, 2013 Year 2016 [Member] Medium Aircraft [Member]	Sep. 30, 2013 Year 2016 [Member] Large Aircraft [Member]	Sep. 30, 2013 Year 2016 [Member] Medium and Large [Member]	Sep. 30, 2013 Year 2016 [Member] SAR Configured [Member]	Sep. 30, 2013 Year 2017 [Member]	Sep. 30, 2013 Year 2017 [Member] Medium Aircraft [Member]	Sep. 30, 2013 Year 2017 [Member] Large Aircraft [Member]	Sep. 30, 2013 Year 2017 [Member] Medium and Large [Member]	Sep. 30, 2013 Year 2017 [Member] SAR Configured [Member]	Sep. 30, 2013 Year 2018 and Thereafter [Member]	Sep. 30, 2013 Year 2018 and Thereafter [Member] Medium Aircraft [Member]	Sep. 30, 2013 Year 2018 and Thereafter [Member] Large Aircraft [Member]	Sep. 30, 2013 Year 2018 and Thereafter [Member] Medium and Large [Member]	Sep. 30, 2013 Year 2018 and Thereafter [Member] SAR Configured [Member]	Sep. 30, 2013 Fiscal Year One And Two [Member]	Sep. 30, 2013 Fiscal Years Three To Five [Member]	Sep. 30, 2013 Fiscal Year Six And Thereafter [Member]
Commitments And Contingencies [Line Items]
Lease term of the aircraft			The aircraft leases range from base terms of 60 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.
Aircraft Purchase Commitments - Total	$ 963,627,000		$ 963,627,000													$ 587,693,000	$ 375,934,000													$ 324,417,000			$ 237,696,000	$ 86,721,000	$ 408,612,000			$ 236,116,000	$ 172,496,000	$ 204,829,000			$ 88,112,000	$ 116,717,000	$ 25,769,000			$ 25,769,000	$ 0	$ 0			$ 0	$ 0
Monthly Rent payment			6,417,000																																																				192,000	3,550,000	2,675,000
Number of leased aircraft	42		42																																																				2	17	23
Operating leases rental expense	23,300,000	15,300,000	46,400,000	31,600,000														18,000,000	10,300,000	36,100,000	21,500,000
Collective Bargaining Agreements and/or Unions							51.00%
Work force reductions costs				2,200,000	300,000	300,000
Officer Compensation Expense				2,000,000
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.
Aircraft Purchase Options - Total	1,312,478,000		1,312,478,000																											47,059,000					257,393,000					419,491,000					391,602,000					196,933,000
Number of aircraft purchase commitments	57		57					15		15		24		24			18					10								13	5	8		0	28	10	8		10	14	0	6		8	2	0	2		0	0	0	0		0
Number of aircraft purchase options	63		63					22		22		41		41								16								0	0	0			9	5	4			20	9	11			20	5	15			14	3	11
Number of signed client contracts	11		11
Number of contingent aircraft orders																										22		13
Sale Leaseback Transaction, Gross Proceeds	$ 145,600,000	$ 50,400,000	$ 145,600,000	$ 50,400,000
Sale Leaseback Transaction, Description of Asset(s)	7	2	7	2
Analysis Of Aircraft Orders And Options [Line Items]
Beginning of quarter																										47	45	70	70
Aircraft Delivered	5	0	10	3				3	0	5	0	2	0	5	3											(5)	(5)	0	0
Aircraft ordered																										11	7	0	0
Exercised options																										4	0	(4)	0
Expired Options																										0	0	(3)	0
End of quarter																										57	47	63	70
Number of aircraft suspend operations	16																						12	1	3
Employee Agreement Escalation Rate	up to 12%