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BASIS OF PRESENTATION, CONSOLIDATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment Disposed of and Impairments (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
Property, Plant and Equipment [Line Items]        
Number of aircraft sold or disposed of | aircraft 0 0 6 6
Proceeds from asset dispositions $ 269 $ 329 $ 42,244 $ 11,819
Loss on disposal of assets $ (8,526) $ (2,186) $ (7,827) $ (12,203)
Number of aircraft impaired | aircraft 2 6 4 13
Impairment charges on aircraft held for sale $ 8,183 $ 1,011 $ 9,747 $ 11,160
Air transportation equipment        
Property, Plant and Equipment [Line Items]        
Loss on disposal of assets (343) $ (1,175) 1,920 $ (1,043)
Bristow Academy | Held-for-sale        
Property, Plant and Equipment [Line Items]        
Impairment charges on aircraft held for sale $ 6,500   $ 6,500