FAIR VALUE DISCLOSURES - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018 USD ($) aircraft	Sep. 30, 2017 USD ($) aircraft	Sep. 30, 2018 USD ($) aircraft	Sep. 30, 2017 USD ($) aircraft
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment charges on aircraft held for sale	$ 0	$ 8,183	$ 0	$ 9,747
Number of aircraft impaired | aircraft	0	2	0	4
Bristow Academy [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment charges on aircraft held for sale		$ 6,500		$ 6,500