BASIS OF PRESENTATION, CONSOLIDATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment Disposed of and Impairments (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2018 USD ($) aircraft	Dec. 31, 2017 USD ($) aircraft	Dec. 31, 2018 USD ($) aircraft	Dec. 31, 2017 USD ($) aircraft
Property, Plant and Equipment [Line Items]
Number of aircraft sold or disposed of | aircraft	0	5	3	11
Proceeds from asset dispositions	$ 631	$ 6,303	$ 9,093	$ 48,547
Loss on disposal of assets	$ (16,015)	$ (4,591)	$ (18,986)	$ (12,418)
Number of held for sale aircraft impaired | aircraft	2	1	2	5
Impairment charges on aircraft held for sale	$ 1,350	$ 1,560	$ 1,350	$ 11,307
Impairment of property and equipment	0	0	104,939	0
Contract termination costs	13,971	0	13,971	0
Bristow Academy [Member]
Property, Plant and Equipment [Line Items]
Impairment charges on aircraft held for sale				6,500
H225 Aircraft [Member]
Property, Plant and Equipment [Line Items]
Impairment of property and equipment			87,500
Eastern Airways [Member]
Property, Plant and Equipment [Line Items]
Impairment of property and equipment			17,500
Air transportation equipment
Property, Plant and Equipment [Line Items]
Loss on disposal of assets	694	$ 3,031	3,665	$ 1,111
Progress payments
Property, Plant and Equipment [Line Items]
Contract termination costs	11,700		11,700
Capitalized interest
Property, Plant and Equipment [Line Items]
Contract termination costs	$ 2,300		$ 2,300