COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands		1 Months Ended	12 Months Ended
	Apr. 29, 2016 aircraft People	Nov. 30, 2005 USD ($) People	Mar. 31, 2017 USD ($) aircraft Facility	Mar. 31, 2016 USD ($) aircraft	Mar. 31, 2015 USD ($) aircraft
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of signed client contracts			4
Number of aircrafts purchased without orders			1	1	3
Operating lease [Line Items]
Operating leases rental expense | $			$ 212,600	$ 211,800	$ 164,800
Operating leases, future minimum payments, due 2018 | $			191,259
Operating leases, future minimum payments, due 2019 | $			164,549
Operating leases, future minimum payments, due 2020 | $			115,035
Operating leases, future minimum payments, due 2021 | $			46,775
Operating leases, future minimum payments, due 2022 | $			26,872
Operating leases, future minimum payments, due thereafter | $			41,755
Operating leases, future minimum payments, total | $			$ 586,245
Number of aircraft sale leaseback				3	14
Aircraft lease terms, maximum			180 months
Aircraft lease renewal option terms, maximum			240 months
Sale leaseback transaction, gross proceeds | $				$ 29,200	$ 380,700
Number of operating lease			95
Site contingency, number of locations | Facility			3
Number of aircraft operated			459
Minimum
Operating lease [Line Items]
Loss Contingency, Estimate of Possible Loss | $			$ 5,000
Maximum
Operating lease [Line Items]
Loss Contingency, Estimate of Possible Loss | $			$ 8,000
Nigerian litigation
Operating lease [Line Items]
Number of affiliates | People		2
Loss contingency, damages sought, value | $		$ 16,300
CHC fatal accident
Operating lease [Line Items]
Number of fatalities | People	13
CHC fatal accident | Crew
Operating lease [Line Items]
Number of fatalities | People	2
CHC fatal accident | Passenger
Operating lease [Line Items]
Number of fatalities | People	11
Unionized employees concentration risk
Operating lease [Line Items]
Concentration risk, percentage			51.00%
Collective bargaining agreements, maximum annual escalation per employee, percent			4.50%
Unionized employees concentration risk | Workforce subject to collective bargaining arrangements expiring within one year
Operating lease [Line Items]
Concentration risk, percentage			92.00%
H225 Super Puma
Operating lease [Line Items]
Number of aircraft operated	27
Number of aircrafts owned	16
Number of leased aircraft	11
H225 Super Puma | Norway
Operating lease [Line Items]
Number of aircraft operated	5
H225 Super Puma | United Kingdom
Operating lease [Line Items]
Number of aircraft operated	13
H225 Super Puma | Australia
Operating lease [Line Items]
Number of aircraft operated	9
H225 Super Puma | Commercial Purposes [Member] | Norway
Operating lease [Line Items]
Number Of Aircraft Suspend Operations			1
H225 Super Puma | Commercial Purposes [Member] | United Kingdom
Operating lease [Line Items]
Number Of Aircraft Suspend Operations			13
H225 Super Puma | Commercial Purposes [Member] | Australia
Operating lease [Line Items]
Number Of Aircraft Suspend Operations			6
H225 Super Puma | Search And Rescue Purposes [Member] | Norway
Operating lease [Line Items]
Number Of Aircraft Suspend Operations			4
H225 Super Puma | Search And Rescue Purposes [Member] | Australia
Operating lease [Line Items]
Number Of Aircraft Suspend Operations			3
Fiscal year 2018 to fiscal year 2019
Operating lease [Line Items]
Number of operating lease			33
Fiscal year 2020 to fiscal year 2022
Operating lease [Line Items]
Number of operating lease			48
Fiscal year 2023 to fiscal year 2025
Operating lease [Line Items]
Number of operating lease			14
Other commitments
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded unconditional purchase obligation | $			$ 55,100
Aircraft operating lease
Operating lease [Line Items]
Operating leases rental expense | $			188,200	$ 184,000	$ 138,300
Operating leases, future minimum payments, due 2018 | $			179,940
Operating leases, future minimum payments, due 2019 | $			154,331
Operating leases, future minimum payments, due 2020 | $			106,513
Operating leases, future minimum payments, due 2021 | $			39,327
Operating leases, future minimum payments, due 2022 | $			19,930
Operating leases, future minimum payments, due thereafter | $			9,387
Operating leases, future minimum payments, total | $			509,428
Other operating lease
Operating lease [Line Items]
Operating leases, future minimum payments, due 2018 | $			11,319
Operating leases, future minimum payments, due 2019 | $			10,218
Operating leases, future minimum payments, due 2020 | $			8,522
Operating leases, future minimum payments, due 2021 | $			7,448
Operating leases, future minimum payments, due 2022 | $			6,942
Operating leases, future minimum payments, due thereafter | $			32,368
Operating leases, future minimum payments, total | $			$ 76,817
Commitments
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of aircraft - beginning balance			36	45	43
Number of aircraft delivered			(9)	(8)	(18)
Number of aircraft ordered			5	0	8
New options			0	0	0
Number of exercised options			0	(1)	12
Number of expired options			0	0	0
Number of aircraft - ending balance			32	36	45
Options
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of aircraft - beginning balance			14	30	55
Number of aircraft delivered			0	0	0
Number of aircraft ordered			0	0	0
New options			0	4	0
Number of exercised options			0	0	(12)
Number of expired options			(10)	(20)	(13)
Number of aircraft - ending balance			4	14	30
Aircraft
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded unconditional purchase obligation minimum quantity required, due in one year			9
Unrecorded unconditional purchase obligation minimum quantity required, due in year two			5
Unrecorded unconditional purchase obligation minimum quantity required, due in year three			4
Unrecorded unconditional purchase obligation minimum quantity required, due in year four and thereafter			14
Unrecorded unconditional purchase obligation, minimum quantity required			32
Unrecorded unconditional purchase obligation, due within one year | $			$ 61,238
Unrecorded unconditional purchase obligation, due within two years | $			89,994
Unrecorded unconditional purchase obligation, due within three years | $			69,504
Unrecorded unconditional purchase obligation, due within four years and thereafter | $			187,532
Unrecorded unconditional purchase obligation | $			$ 408,268
Unrecorded conditional purchase obligation, maximum quantity required, due in one year			0
Unrecorded conditional purchase obligation, maximum quantity required, due in year two			2
Unrecorded conditional purchase obligation, maximum quantity required, due in year three			2
Unrecorded conditional purchase obligation, maximum quantity required, due in year four and thereafter			0
Unrecorded conditional purchase obligation, maximum quantity required			4
Unrecorded conditional purchase obligation balance on first anniversary | $			$ 0
Unrecorded conditional purchase obligation balance on second anniversary | $			44,181
Unrecorded conditional purchase obligation balance on third anniversary | $			31,536
Unrecorded Conditional Purchase Obligation Balance On Fourth Anniversary And After | $			0
Unrecorded conditional purchase obligation balance sheet amount | $			75,717
Aircraft | Medium and large aircraft
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded unconditional purchase obligation, due within one year | $			2,263
Unrecorded unconditional purchase obligation, due within two years | $			89,994
Unrecorded unconditional purchase obligation, due within three years | $			69,504
Unrecorded unconditional purchase obligation, due within four years and thereafter | $			187,532
Unrecorded unconditional purchase obligation | $			$ 349,293
Aircraft | U.K. SAR configured aircraft
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded unconditional purchase obligation minimum quantity required, due in one year			4
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 thereafter			0
Unrecorded unconditional purchase obligation, minimum quantity required			4
Unrecorded unconditional purchase obligation, due within one year | $			$ 58,975
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 thereafter | $			0
Unrecorded unconditional purchase obligation | $			$ 58,975
Aircraft | Medium aircraft
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded unconditional purchase obligation minimum quantity required, due in one year			5
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 thereafter			0
Unrecorded unconditional purchase obligation, minimum quantity required			5
Aircraft | Large aircraft
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded unconditional purchase obligation minimum quantity required, due in one year			0
Unrecorded unconditional purchase obligation minimum quantity required, due in year two			5
Unrecorded unconditional purchase obligation minimum quantity required, due in year three			4
Unrecorded unconditional purchase obligation minimum quantity required, due in year four and thereafter			14
Unrecorded unconditional purchase obligation, minimum quantity required			23
Unrecorded conditional purchase obligation, maximum quantity required, due in one year			0
Unrecorded conditional purchase obligation, maximum quantity required, due in year two			2
Unrecorded conditional purchase obligation, maximum quantity required, due in year three			2
Unrecorded conditional purchase obligation, maximum quantity required, due in year four and thereafter			0
Unrecorded conditional purchase obligation, maximum quantity required			4
Cancellable commitments
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded unconditional purchase obligation, minimum quantity required			5
Unrecorded unconditional purchase obligation | $			$ 80,600
Deposits | $			$ 4,500