FAIR VALUE DISCLOSURES - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017 USD ($) aircraft	Sep. 30, 2016 USD ($) aircraft	Sep. 30, 2017 USD ($) aircraft	Sep. 30, 2016 USD ($) aircraft
Fair Value Disclosures [Abstract]
Number of aircraft impaired | aircraft	2	6	4	13
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charges on aircraft held for sale	$ 8,183	$ 1,011	$ 9,747	$ 11,160
Bristow Academy | Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charges on aircraft held for sale	$ 6,500		$ 6,500