PROPERTY AND EQUIPMENT, ASSETS HELD FOR SALE AND OEM COST RECOVERIES Narrative (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2018 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($) aircraft	Mar. 31, 2018 USD ($) aircraft	Mar. 31, 2017 USD ($) aircraft
Property and equipment [Line Items]
Impairment of aircraft and equipment					$ 104,939	$ 0	$ 0
Number of aircraft transferred to held for sale | aircraft					2	4	12
Property, Plant and Equipment, Gross, Period Increase (Decrease)					$ (1,500)	$ (9,300)	$ (19,700)
Number Of Aircraft Transferred Out Of Held For Sale | aircraft					3
Property, Plant and Equipment, Transfers and Changes					$ 8,200
Restructuring and Related Cost, Accelerated Depreciation							$ 10,400
Number Of Aircraft In Exit Plan | aircraft							11
H225 Aircraft [Member]
Property and equipment [Line Items]
Impairment of aircraft and equipment	$ 87,500				87,500
Accumulated Depreciation, Depletion and Amortization, Property, Plant and Equipment, Period Increase (Decrease)					3,000
Other Aircraft Type [Member]
Property and equipment [Line Items]
Accumulated Depreciation, Depletion and Amortization, Property, Plant and Equipment, Period Increase (Decrease)					$ 1,400
Scenario, Forecast [Member] | H225 Aircraft [Member]
Property and equipment [Line Items]
Accumulated Depreciation, Depletion and Amortization, Property, Plant and Equipment, Period Increase (Decrease)		$ (10,300)	$ 1,900	$ 5,900
Scenario, Forecast [Member] | Other Aircraft Type [Member]
Property and equipment [Line Items]
Accumulated Depreciation, Depletion and Amortization, Property, Plant and Equipment, Period Increase (Decrease)				$ 2,800