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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, 2018
USD ($)
aircraft
Sep. 30, 2017
USD ($)
aircraft
Sep. 30, 2018
USD ($)
aircraft
Sep. 30, 2017
USD ($)
aircraft
Property, Plant and Equipment [Line Items]        
Number of aircraft sold or disposed of | aircraft 0 0 3 6
Proceeds from asset dispositions $ 688 $ 269 $ 8,462 $ 42,244
Loss on disposal of assets $ (1,293) $ (8,526) $ (2,971) $ (7,827)
Number of held for sale aircraft impaired | aircraft 0 2 0 4
Impairment charges on aircraft held for sale $ 0 $ 8,183 $ 0 $ 9,747
Impairment of property and equipment 104,939 0 104,939 0
Bristow Academy [Member]        
Property, Plant and Equipment [Line Items]        
Impairment charges on aircraft held for sale   6,500   6,500
H225 Aircraft [Member]        
Property, Plant and Equipment [Line Items]        
Impairment of property and equipment 87,500   87,500  
Eastern Airways [Member]        
Property, Plant and Equipment [Line Items]        
Impairment of property and equipment 17,500   17,500  
Air transportation equipment        
Property, Plant and Equipment [Line Items]        
Loss on disposal of assets $ (1,293) $ (343) $ (2,971) $ 1,920