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VARIABLE INTEREST ENTITIES AND OTHER INVESTMENTS IN SIGNIFICANT AFFILIATES Other Significant Affiliates - Unconsolidated (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Apr. 30, 2017
USD ($)
Apr. 30, 2016
USD ($)
Apr. 30, 2015
USD ($)
Mar. 31, 2018
USD ($)
aircraft
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2014
USD ($)
Schedule of Equity Method Investments [Line Items]              
Number of aircraft operated | aircraft       405      
Payment of contingent consideration       $ 0 $ 10,000 $ 9,453  
Investment in unconsolidated affiliates       126,170 210,162    
Impairment of investment in unconsolidated affiliates       $ 85,683 $ 0 0  
Cougar              
Schedule of Equity Method Investments [Line Items]              
Equity Method Investment, Ownership Percentage       40.00% 40.00%    
Business acquisition, percentage of voting interests acquired       25.00%      
Number Of Aircraft Leased From Affiliates | aircraft       8      
Potential earn-out payments       $ 40,000      
Business combination contingent consideration arrangement terms       3 years      
Payment of contingent consideration $ 16,000 $ 10,000 $ 8,000       $ 6,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value         $ 16,000    
Investment in unconsolidated affiliates       $ 54,009 56,885    
Reporting Of Unconsolidated Affiliate Earnings, Time Difference       3 months      
Cougar | VIH Aviation Group              
Schedule of Equity Method Investments [Line Items]              
Costs and Expenses, Related Party       $ 19,300 12,500 6,500  
Cougar | VIH Aerospace              
Schedule of Equity Method Investments [Line Items]              
Related Party Transaction, Purchases from Related Party         500 $ 2,600  
Cougar | VIH Helicopters USA              
Schedule of Equity Method Investments [Line Items]              
Costs and Expenses, Related Party       $ 200 $ 100    
Lider              
Schedule of Equity Method Investments [Line Items]              
Equity Method Investment, Ownership Percentage       41.90% 41.90%    
Business acquisition, percentage of voting interests acquired       20.00%      
Investment in unconsolidated affiliates       $ 62,267 $ 143,477    
Impairment of investment in unconsolidated affiliates       $ 85,700      
Lider | Aircraft              
Schedule of Equity Method Investments [Line Items]              
Number of aircraft operated | aircraft       41      
Lider | Fixed wing aircraft              
Schedule of Equity Method Investments [Line Items]              
Number of aircraft operated | aircraft       20      
Petroleum Air Services              
Schedule of Equity Method Investments [Line Items]              
Equity Method Investment, Ownership Percentage       25.00% 25.00%    
Investment in unconsolidated affiliates       $ 6,286 $ 6,286    
Number Of Aicraft Owned | aircraft       48