COMMITMENTS AND CONTINGENCIES (Details) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended
	Dec. 31, 2014 aircraft Agreements Facility	Dec. 31, 2013 aircraft	Dec. 31, 2014 aircraft Agreements Facility	Dec. 31, 2013 aircraft	Sep. 30, 2014 aircraft	Jun. 30, 2014 aircraft	Feb. 20, 2014 Recommendation
Commitments And Contingencies [Line Items]
Number of signed client contracts	16		16
Analysis Of Aircraft Orders And Options [Line Items]
Aircraft Delivered	(6)	(7)	(17)	(17)
Operating leases rental expense	$ 46,300,000	$ 28,300,000	$ 114,800,000	$ 74,600,000
Number of aircraft sale leaseback	0	6	14	13
Sale leaseback transaction, gross proceeds		72,300,000	380,700,000	217,900,000
Number of agreements to lease back aircraft	0		14
Lease terms of the aircrafts			The aircraft leases range from base terms of up to 180 months with renewal options of up to 240 months in some cases, include purchase options upon expiration and some include early purchase options.
Monthly Rent payment			12,144,000
Number of leased aircraft	81		81
Collective Bargaining Agreements, Maximum Annual Escalation Per Employee, Percent	8.00%
Site Contingency, Number of Locations	3		3
Total Number Of Safety Recommendations, CAP 1145							60
Number Of Recommendations To Improve Survivability, CAP 1145							10
Loss Contingency, Range of Possible Loss, Minimum	5,000,000		5,000,000
Loss Contingency, Range of Possible Loss, Maximum	8,000,000		8,000,000
Maximum [Member]
Analysis Of Aircraft Orders And Options [Line Items]
Sale Leaseback Transaction, Lease Terms, Number of Months			180
Sale Leaseback Transaction, Lease Terms, Number of Months, Renewal Option			240
North America [Member]
Analysis Of Aircraft Orders And Options [Line Items]
Work force reductions costs			900,000	1,700,000
Unionized Employees Concentration Risk [Member]
Analysis Of Aircraft Orders And Options [Line Items]
Concentration Risk, Percentage	51.00%
Medium Aircraft [Member]
Analysis Of Aircraft Orders And Options [Line Items]
Aircraft Delivered	(2)	(3)	(5)	(8)
Large Aircraft [Member]
Analysis Of Aircraft Orders And Options [Line Items]
Aircraft Delivered	(4)	(4)	(12)	(9)
Aircraft [Member]
Analysis Of Aircraft Orders And Options [Line Items]
Operating leases rental expense	40,100,000	22,300,000	95,000,000	58,400,000
Commitments [Member]
Commitments And Contingencies [Line Items]
Number of contingent aircraft	5		5
Analysis Of Aircraft Orders And Options [Line Items]
Beginning of quarter	35		43		37	43
Aircraft Delivered	(3)				(2)	(9)
Aircraft ordered	3				0	0
Exercised options	2				0	3
Expired Options	0				0	0
End of quarter	37		37		35	37
Options [Member]
Commitments And Contingencies [Line Items]
Number of contingent aircraft	7		7
Analysis Of Aircraft Orders And Options [Line Items]
Beginning of quarter	48		55		51	55
Aircraft Delivered	0				0	0
Aircraft ordered	0				0	0
Exercised options	(2)				0	(3)
Expired Options	(7)				(3)	(1)
End of quarter	39		39		48	51
Other Commitments [Member]
Commitments [Abstract]
Purchase commitments	318,600,000		318,600,000
Aircraft [Member]
Commitments [Abstract]
Number of aircraft purchase commitments, due remainder of fiscal year	8		8
Number of aircraft purchase commitments, due in two years	23		23
Number of aircraft purchase commitments, due in three years	5		5
Number of aircraft purchase commitments, due in four years	1		1
Number of aircraft purchase commitments, due in five years and after	0		0
Number of aircraft purchase commitments	37		37
Purchase commitments, due remainder of year	123,232,000		123,232,000
Purchase commitments, Due within Two Years	388,328,000		388,328,000
Purchase commitments, Due within Three Years	68,121,000		68,121,000
Purchase commitments, Due within Four Years	11,689,000		11,689,000
Purchase commitments, Due within Five Years And After	0		0
Purchase commitments	591,370,000		591,370,000
Options [Abstract]
Number of aircraft purchase options, due remainder of fiscal year	0		0
Number of aircraft purchase options, due in two years	0		0
Number of aircraft purchase options, due in three years	18		18
Number of aircraft purchase options, due in four years	17		17
Number of aircraft purchase options, due in five years and after	4		4
Number of aircraft purchase options	39		39
Aircraft purchase options, due remainder of year	7,647,000		7,647,000
Aircraft purchase options, due in two years	107,238,000		107,238,000
Aircraft purchase options, due in three years	371,133,000		371,133,000
Aircraft purchase options, due in four years	243,293,000		243,293,000
Aircraft purchase options, due in five years and after	47,322,000		47,322,000
Aircraft purchase options	776,633,000		776,633,000
Aircraft [Member] | Medium Aircraft [Member]
Commitments [Abstract]
Number of aircraft purchase commitments, due remainder of fiscal year	3		3
Number of aircraft purchase commitments, due in two years	7		7
Number of aircraft purchase commitments, due in three years	0		0
Number of aircraft purchase commitments, due in four years	0		0
Number of aircraft purchase commitments, due in five years and after	0		0
Number of aircraft purchase commitments	10		10
Options [Abstract]
Number of aircraft purchase options, due remainder of fiscal year	0		0
Number of aircraft purchase options, due in two years	0		0
Number of aircraft purchase options, due in three years	7		7
Number of aircraft purchase options, due in four years	7		7
Number of aircraft purchase options, due in five years and after	0		0
Number of aircraft purchase options	14		14
Aircraft [Member] | Large Aircraft [Member]
Commitments [Abstract]
Number of aircraft purchase commitments, due remainder of fiscal year	0		0
Number of aircraft purchase commitments, due in two years	10		10
Number of aircraft purchase commitments, due in three years	5		5
Number of aircraft purchase commitments, due in four years	1		1
Number of aircraft purchase commitments, due in five years and after	0		0
Number of aircraft purchase commitments	16		16
Options [Abstract]
Number of aircraft purchase options, due remainder of fiscal year	0		0
Number of aircraft purchase options, due in two years	0		0
Number of aircraft purchase options, due in three years	11		11
Number of aircraft purchase options, due in four years	10		10
Number of aircraft purchase options, due in five years and after	4		4
Number of aircraft purchase options	25		25
Aircraft [Member] | Medium and Large [Member]
Commitments [Abstract]
Purchase commitments, due remainder of year	62,809,000		62,809,000
Purchase commitments, Due within Two Years	288,181,000		288,181,000
Purchase commitments, Due within Three Years	68,121,000		68,121,000
Purchase commitments, Due within Four Years	11,689,000		11,689,000
Purchase commitments, Due within Five Years And After	0		0
Purchase commitments	430,800,000		430,800,000
Aircraft [Member] | SAR Configured [Member]
Commitments [Abstract]
Number of aircraft purchase commitments, due remainder of fiscal year	5		5
Number of aircraft purchase commitments, due in two years	6		6
Number of aircraft purchase commitments, due in three years	0		0
Number of aircraft purchase commitments, due in four years	0		0
Number of aircraft purchase commitments, due in five years and after	0		0
Number of aircraft purchase commitments	11		11
Purchase commitments, due remainder of year	60,423,000		60,423,000
Purchase commitments, Due within Two Years	100,147,000		100,147,000
Purchase commitments, Due within Three Years	0		0
Purchase commitments, Due within Four Years	0		0
Purchase commitments, Due within Five Years And After	0		0
Purchase commitments	160,570,000		160,570,000
Remainder of FY2015 to FY2016 [Member]
Analysis Of Aircraft Orders And Options [Line Items]
Monthly Rent payment			706,000
Number of leased aircraft	7		7
FY2017 to FY2019 [Member]
Analysis Of Aircraft Orders And Options [Line Items]
Monthly Rent payment			4,588,000
Number of leased aircraft	28		28
FY2020 to FY2024 [Member]
Analysis Of Aircraft Orders And Options [Line Items]
Monthly Rent payment			$ 6,850,000
Number of leased aircraft	46		46