COMMITMENTS AND CONTINGENCIES (Details) (USD $)	3 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2014
Commitments And Contingencies [Line Items]
Number of aircraft purchase commitments	37
Purchase Commitments - Total	$ 658,017,000
Number of aircraft purchase options	51
Aircraft Purchase Options - Total	1,027,155,000
Number of signed client contracts	19
Analysis Of Aircraft Orders And Options [Line Items]
Aircraft Delivered	(9)	(6)
Operating leases rental expense	33,100,000	23,100,000
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.
Monthly Rent payment	8,049,000
Number of leased aircraft	59
Employee Agreement Escalation Rate	0.08
Number of aircraft suspend operations			16
Alaska [Member]
Analysis Of Aircraft Orders And Options [Line Items]
Work force reductions costs	1,000,000
Unionized Employees Concentration Risk [Member]
Analysis Of Aircraft Orders And Options [Line Items]
Collective Bargaining Agreements and/or Unions	48.00%
Medium Aircraft [Member]
Commitments And Contingencies [Line Items]
Number of aircraft purchase commitments	7
Number of aircraft purchase options	20
Analysis Of Aircraft Orders And Options [Line Items]
Aircraft Delivered	(3)	(3)
Large Aircraft [Member]
Commitments And Contingencies [Line Items]
Number of aircraft purchase commitments	16
Number of aircraft purchase options	31
Analysis Of Aircraft Orders And Options [Line Items]
Aircraft Delivered	(6)	(3)
Medium and Large [Member]
Commitments And Contingencies [Line Items]
Purchase Commitments - Total	381,080,000
SAR Configured [Member]
Commitments And Contingencies [Line Items]
Number of aircraft purchase commitments	14
Purchase Commitments - Total	276,937,000
Aircraft [Member]
Analysis Of Aircraft Orders And Options [Line Items]
Operating leases rental expense	26,400,000	18,100,000
Commitments [Member]
Commitments And Contingencies [Line Items]
Number of contingent aircraft orders	5
Analysis Of Aircraft Orders And Options [Line Items]
Beginning of quarter	43
Aircraft Delivered	(9)
Exercised options	(3)
Expired Options	0
End of quarter	37
Options [Member]
Commitments And Contingencies [Line Items]
Number of contingent aircraft orders	7
Analysis Of Aircraft Orders And Options [Line Items]
Beginning of quarter	55
Aircraft Delivered	0
Exercised options	(3)
Expired Options	(1)
End of quarter	51
Other Commitments [Member]
Commitments And Contingencies [Line Items]
Purchase Commitments - Total	87,700,000
Remainder of Year 2015 [Member]
Commitments And Contingencies [Line Items]
Number of aircraft purchase commitments	17
Purchase Commitments - Total	373,440,000
Number of aircraft purchase options	0
Aircraft Purchase Options - Total	46,014,000
Remainder of Year 2015 [Member] | Medium Aircraft [Member]
Commitments And Contingencies [Line Items]
Number of aircraft purchase commitments	7
Number of aircraft purchase options	0
Remainder of Year 2015 [Member] | Large Aircraft [Member]
Commitments And Contingencies [Line Items]
Number of aircraft purchase commitments	5
Number of aircraft purchase options	0
Remainder of Year 2015 [Member] | Medium and Large [Member]
Commitments And Contingencies [Line Items]
Purchase Commitments - Total	205,553,000
Remainder of Year 2015 [Member] | SAR Configured [Member]
Commitments And Contingencies [Line Items]
Number of aircraft purchase commitments	5
Purchase Commitments - Total	167,887,000
Year 2016 [Member]
Commitments And Contingencies [Line Items]
Number of aircraft purchase commitments	16
Purchase Commitments - Total	235,343,000
Number of aircraft purchase options	10
Aircraft Purchase Options - Total	263,627,000
Year 2016 [Member] | Medium Aircraft [Member]
Commitments And Contingencies [Line Items]
Number of aircraft purchase commitments	0
Number of aircraft purchase options	6
Year 2016 [Member] | Large Aircraft [Member]
Commitments And Contingencies [Line Items]
Number of aircraft purchase commitments	7
Number of aircraft purchase options	4
Year 2016 [Member] | Medium and Large [Member]
Commitments And Contingencies [Line Items]
Purchase Commitments - Total	126,293,000
Year 2016 [Member] | SAR Configured [Member]
Commitments And Contingencies [Line Items]
Number of aircraft purchase commitments	9
Purchase Commitments - Total	109,050,000
Year 2017 [Member]
Commitments And Contingencies [Line Items]
Number of aircraft purchase commitments	4
Purchase Commitments - Total	49,234,000
Number of aircraft purchase options	21
Aircraft Purchase Options - Total	440,060,000
Year 2017 [Member] | Medium Aircraft [Member]
Commitments And Contingencies [Line Items]
Number of aircraft purchase commitments	0
Number of aircraft purchase options	7
Year 2017 [Member] | Large Aircraft [Member]
Commitments And Contingencies [Line Items]
Number of aircraft purchase commitments	4
Number of aircraft purchase options	14
Year 2017 [Member] | Medium and Large [Member]
Commitments And Contingencies [Line Items]
Purchase Commitments - Total	49,234,000
Year 2017 [Member] | SAR Configured [Member]
Commitments And Contingencies [Line Items]
Number of aircraft purchase commitments	0
Purchase Commitments - Total	0
Year 2018 [Member]
Commitments And Contingencies [Line Items]
Number of aircraft purchase commitments	0
Purchase Commitments - Total	0
Number of aircraft purchase options	19
Aircraft Purchase Options - Total	265,346,000
Year 2018 [Member] | Medium Aircraft [Member]
Commitments And Contingencies [Line Items]
Number of aircraft purchase commitments	0
Number of aircraft purchase options	7
Year 2018 [Member] | Large Aircraft [Member]
Commitments And Contingencies [Line Items]
Number of aircraft purchase commitments	0
Number of aircraft purchase options	12
Year 2018 [Member] | Medium and Large [Member]
Commitments And Contingencies [Line Items]
Purchase Commitments - Total	0
Year 2018 [Member] | SAR Configured [Member]
Commitments And Contingencies [Line Items]
Number of aircraft purchase commitments	0
Purchase Commitments - Total	0
Year 2019 and Thereafter [Member]
Commitments And Contingencies [Line Items]
Number of aircraft purchase commitments	0
Purchase Commitments - Total	0
Number of aircraft purchase options	1
Aircraft Purchase Options - Total	12,108,000
Year 2019 and Thereafter [Member] | Medium Aircraft [Member]
Commitments And Contingencies [Line Items]
Number of aircraft purchase commitments	0
Number of aircraft purchase options	0
Year 2019 and Thereafter [Member] | Large Aircraft [Member]
Commitments And Contingencies [Line Items]
Number of aircraft purchase commitments	0
Number of aircraft purchase options	1
Year 2019 and Thereafter [Member] | Medium and Large [Member]
Commitments And Contingencies [Line Items]
Purchase Commitments - Total	0
Year 2019 and Thereafter [Member] | SAR Configured [Member]
Commitments And Contingencies [Line Items]
Number of aircraft purchase commitments	0
Purchase Commitments - Total	0
Remainder of FY2015 to FY2016 [Member]
Analysis Of Aircraft Orders And Options [Line Items]
Monthly Rent payment	1,001,000
Number of leased aircraft	6
FY2017 to FY2019 [Member]
Analysis Of Aircraft Orders And Options [Line Items]
Monthly Rent payment	4,297,000
Number of leased aircraft	27
FY2020 to FY2024 [Member]
Analysis Of Aircraft Orders And Options [Line Items]
Monthly Rent payment	$ 2,751,000
Number of leased aircraft	26