COMMITMENTS AND CONTINGENCIES (Details) (USD $)	12 Months Ended			1 Months Ended
	Mar. 31, 2015 aircraft Facility	Mar. 31, 2014 aircraft	Mar. 31, 2013 aircraft	Nov. 30, 2005 Affiliates
Analysis of aircraft orders and options [Roll Forward]
Number Of Signed Client Contracts	13
Number of Aircraft Orders Subject To Successful Development	17
Number Of Aircrafts Purchased Without Orders	3
Leases, Operating [Abstract]
Operating leases rental expense	$ 164,800,000	$ 105,800,000	$ 67,400,000
Operating Leases, Future Minimum Payments Due, Current	166,444,000
Operating Leases, Future Minimum Payments, Due in Two Years	163,248,000
Operating Leases, Future Minimum Payments, Due in Three Years	146,271,000
Operating Leases, Future Minimum Payments, Due in Four Years	118,705,000
Operating Leases, Future Minimum Payments, Due in Five Years	79,792,000
Operating Leases, Future Minimum Payments, Due Thereafter	78,614,000
Operating Leases, Future Minimum Payments Due	753,074,000
Number of aircraft sale leaseback	14	14	11
Number of agreements to lease back aircraft	14	14
Proceeds from assignment of aircraft purchase agreements	0	106,113,000	0
Number Of Aircraft Assigned Future Payments	2	7
Sale Leaseback Transaction, Gross Proceeds	380,700,000	246,400,000	255,800,000
Number of operating lease	82
Monthly Rent payment	13,143,000
Collective Bargaining Agreements, Maximum Annual Escalation Per Employee, Percent	6.00%
Officer Compensation Expense	5,500,000	2,900,000	2,000,000
Site Contingency, Number of Locations	3
Loss Contingency, Range of Possible Loss, Minimum	5,000,000
Loss Contingency, Range of Possible Loss, Maximum	8,000,000
West Africa [Member]
Leases, Operating [Abstract]
Work force reductions costs	900,000
Alaska [Member]
Leases, Operating [Abstract]
Work force reductions costs	900,000	2,900,000
Southern North Sea [Member]
Leases, Operating [Abstract]
Work force reductions costs		2,100,000	2,200,000
Unionized Employees Concentration Risk [Member]
Leases, Operating [Abstract]
Concentration Risk, Percentage	45.00%
Unionized Employees Concentration Risk [Member] | One year [Member]
Leases, Operating [Abstract]
Concentration Risk, Percentage	18.00%
Aircraft Operating Lease [Member]
Leases, Operating [Abstract]
Operating leases rental expense	138,300,000	83,500,000	46,800,000
Operating Leases, Future Minimum Payments Due, Current	158,066,000
Operating Leases, Future Minimum Payments, Due in Two Years	155,450,000
Operating Leases, Future Minimum Payments, Due in Three Years	137,407,000
Operating Leases, Future Minimum Payments, Due in Four Years	110,139,000
Operating Leases, Future Minimum Payments, Due in Five Years	72,232,000
Operating Leases, Future Minimum Payments, Due Thereafter	26,999,000
Operating Leases, Future Minimum Payments Due	660,293,000
Other Operating Lease [Member]
Leases, Operating [Abstract]
Operating Leases, Future Minimum Payments Due, Current	8,378,000
Operating Leases, Future Minimum Payments, Due in Two Years	7,798,000
Operating Leases, Future Minimum Payments, Due in Three Years	8,864,000
Operating Leases, Future Minimum Payments, Due in Four Years	8,566,000
Operating Leases, Future Minimum Payments, Due in Five Years	7,560,000
Operating Leases, Future Minimum Payments, Due Thereafter	51,615,000
Operating Leases, Future Minimum Payments Due	92,781,000
Fiscal Year 2016 To Fiscal Year 2017 [Member]
Leases, Operating [Abstract]
Number of operating lease	11
Monthly Rent payment	1,627,000
Fiscal Year 2018 To Fiscal Year 2020 [Member]
Leases, Operating [Abstract]
Number of operating lease	49
Monthly Rent payment	9,512,000
Fiscal Year 2021 To Fiscal Year 2024 [Member]
Leases, Operating [Abstract]
Number of operating lease	22
Monthly Rent payment	2,004,000
Nigerian Litigation [Member]
Leases, Operating [Abstract]
Number Of Affiliates				2
Loss Contingency, Damages Sought, Value				16,300,000
Maximum [Member]
Leases, Operating [Abstract]
Sale Leaseback Transaction, Lease Terms, Number of Months	180
Sale Leaseback Transaction, Lease Terms, Number of Months, Renewal Option	240
Commitments [Member]
Analysis of aircraft orders and options [Roll Forward]
Number of aircraft - beginning balance	43	45	15
Number of aircraft delivered	(18)	(21)	(8)
Number of aircraft ordered	8	18	26
Number of new options	0	0	0
Number of exercised options	12	8	12
Number of expired options	0	0	0
Number of orders assigned subject to leaseback	0	(7)	0
Number of aircraft - ending balance	45	43	45
Options [Member]
Analysis of aircraft orders and options [Roll Forward]
Number of aircraft - beginning balance	55	70	40
Number of aircraft delivered	0	0	0
Number of aircraft ordered	0	0	0
Number of new options	0	0	42
Number of exercised options	(12)	(8)	(12)
Number of expired options	(13)	(7)	0
Number of orders assigned subject to leaseback	0	0	0
Number of aircraft - ending balance	30	55	70
Aircraft [Member]
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]
Unrecorded Unconditional Purchase Obligation Minimum Quantity Required Due In Year One	27
Unrecorded Unconditional Purchase Obligation, Minimum Quantity Required, Due In Year Two	5
Unrecorded Unconditional Purchase Obligation, Minimum Quantity Required, Due In Year Three	6
Unrecorded Unconditional Purchase Obligation Minimum Quantity Required Due In Year Four And After	7
Unrecorded Unconditional Purchase Obligation, Minimum Quantity Required	45
Unrecorded Unconditional Purchase Obligation, Due in Next Twelve Months	416,617,000
Unrecorded Unconditional Purchase Obligation, Due within Two Years	88,547,000
Unrecorded Unconditional Purchase Obligation, Due within Three Years	75,936,000
Unrecorded Unconditional Purchase Obligation, Due within Four Years And After	87,231,000
Unrecorded Unconditional Purchase Obligation	668,331,000
Options [Abstract]
Unrecorded Conditional Purchase Obligation Maximum Quantity Required Due In Year One	3
Unrecorded Conditional Purchase Obligation, Maximum Quantity Required, Due In Year Two	13
Unrecorded Conditional Purchase Obligation, Maximum Quantity Required, Due In Year Three	14
Unrecorded Conditional Purchase Obligation Maximum Quantity Required Due In Year Four And After	0
Unrecorded Conditional Purchase Obligation Maximum Quantity Required	30
Unrecorded Conditional Purchase Obligation Balance On First Anniversary	124,382,000
Unrecorded Conditional Purchase Obligation Balance On Second Anniversary	286,814,000
Unrecorded Conditional Purchase Obligation Balance On Third Anniversary	183,060,000
Unrecorded Conditional Purchase Obligation Balance On Fourth Anniversary And After	0
Unrecorded Conditional Purchase Obligation Balance Sheet Amount	594,256,000
Aircraft [Member] | Medium Aircraft [Member]
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]
Unrecorded Unconditional Purchase Obligation Minimum Quantity Required Due In Year One	8
Unrecorded Unconditional Purchase Obligation, Minimum Quantity Required, Due In Year Two	0
Unrecorded Unconditional Purchase Obligation, Minimum Quantity Required, Due In Year Three	0
Unrecorded Unconditional Purchase Obligation Minimum Quantity Required Due In Year Four And After	0
Unrecorded Unconditional Purchase Obligation, Minimum Quantity Required	8
Options [Abstract]
Unrecorded Conditional Purchase Obligation Maximum Quantity Required Due In Year One	3
Unrecorded Conditional Purchase Obligation, Maximum Quantity Required, Due In Year Two	4
Unrecorded Conditional Purchase Obligation, Maximum Quantity Required, Due In Year Three	7
Unrecorded Conditional Purchase Obligation Maximum Quantity Required Due In Year Four And After	0
Unrecorded Conditional Purchase Obligation Maximum Quantity Required	14
Aircraft [Member] | Large Aircraft [Member]
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]
Unrecorded Unconditional Purchase Obligation Minimum Quantity Required Due In Year One	10
Unrecorded Unconditional Purchase Obligation, Minimum Quantity Required, Due In Year Two	5
Unrecorded Unconditional Purchase Obligation, Minimum Quantity Required, Due In Year Three	6
Unrecorded Unconditional Purchase Obligation Minimum Quantity Required Due In Year Four And After	7
Unrecorded Unconditional Purchase Obligation, Minimum Quantity Required	28
Options [Abstract]
Unrecorded Conditional Purchase Obligation Maximum Quantity Required Due In Year One	0
Unrecorded Conditional Purchase Obligation, Maximum Quantity Required, Due In Year Two	9
Unrecorded Conditional Purchase Obligation, Maximum Quantity Required, Due In Year Three	7
Unrecorded Conditional Purchase Obligation Maximum Quantity Required Due In Year Four And After	0
Unrecorded Conditional Purchase Obligation Maximum Quantity Required	16
Aircraft [Member] | U.K. SAR [Member]
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]
Unrecorded Unconditional Purchase Obligation Minimum Quantity Required Due In Year One	9
Unrecorded Unconditional Purchase Obligation, Minimum Quantity Required, Due In Year Two	0
Unrecorded Unconditional Purchase Obligation, Minimum Quantity Required, Due In Year Three	0
Unrecorded Unconditional Purchase Obligation Minimum Quantity Required Due In Year Four And After	0
Unrecorded Unconditional Purchase Obligation, Minimum Quantity Required	9
Unrecorded Unconditional Purchase Obligation, Due in Next Twelve Months	122,796,000
Unrecorded Unconditional Purchase Obligation, Due within Two Years	0
Unrecorded Unconditional Purchase Obligation, Due within Three Years	0
Unrecorded Unconditional Purchase Obligation, Due within Four Years And After	0
Unrecorded Unconditional Purchase Obligation	122,796,000
Aircraft [Member] | Medium And Large [Member]
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]
Unrecorded Unconditional Purchase Obligation, Due in Next Twelve Months	293,821,000
Unrecorded Unconditional Purchase Obligation, Due within Two Years	88,547,000
Unrecorded Unconditional Purchase Obligation, Due within Three Years	75,936,000
Unrecorded Unconditional Purchase Obligation, Due within Four Years And After	87,231,000
Unrecorded Unconditional Purchase Obligation	545,535,000
Other Commitments [Member]
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]
Unrecorded Unconditional Purchase Obligation	$ 308,200,000