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PROPERTY AND EQUIPMENT, ASSETS HELD FOR SALE AND OEM COST RECOVERIES Sold or Disposed and Impairments (Details)
$ in Thousands
12 Months Ended
Mar. 31, 2018
USD ($)
aircraft
Mar. 31, 2017
USD ($)
aircraft
Mar. 31, 2016
USD ($)
aircraft
Property and equipment [Line Items]      
Number of aircraft sold or disposed of (1) | aircraft 11 14 35
Proceeds from asset dispositions $ 48,740 $ 18,471 $ 60,035
Loss on disposal of assets (17,595) (14,499) (30,693)
Impairment charges on aircraft held for sale (2) $ 15,853 $ 12,450 $ 29,571
Number Of Aircraft Sale Leaseback | aircraft 0 0 3
Sale Leaseback Transaction, Gross Proceeds, Investing Activities $ 0 $ 0 $ 29,200
Bristow Academy      
Property and equipment [Line Items]      
Impairment charges on aircraft held for sale (2) $ 6,500    
Aircraft Held for Sale      
Property and equipment [Line Items]      
Number of aircraft impaired | aircraft 8 14 16
Aircraft      
Property and equipment [Line Items]      
Loss on disposal of assets $ 1,742 $ 2,049 $ 1,122