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VARIABLE INTEREST ENTITIES AND OTHER INVESTMENTS IN SIGNIFICANT AFFILIATES Other Significant Affiliates — Consolidated (Details)
$ in Thousands, £ in Millions, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2015
USD ($)
Feb. 06, 2014
Apr. 30, 2017
USD ($)
Apr. 30, 2016
USD ($)
Nov. 30, 2015
USD ($)
Nov. 30, 2015
AUD ($)
Apr. 30, 2015
USD ($)
Jan. 31, 2015
USD ($)
Jan. 31, 2015
AUD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2019
GBP (£)
Mar. 31, 2019
USD ($)
Affiliates
aircraft
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2014
USD ($)
Jan. 31, 2018
Jan. 31, 2015
AUD ($)
Noncontrolling Interest [Line Items]                                    
Number of aircraft operated | aircraft                       378            
Acquisition of noncontrolling interest                         $ (6,121)          
Adjustments to Additional Paid in Capital, Other                         (40,393)          
Payment of contingent consideration                       $ 0 0 $ 10,000        
Redeemable noncontrolling interest [Abstract]                                    
Redeemable Noncontrolling Interest - beginning balance     $ 6,886 $ 15,473           $ 0   0 6,886 15,473        
Noncontrolling interest expense                       0 (4,093) (6,848)        
Currency translation                       0 4,163 (1,739)        
Acquisition of noncontrolling interest                         (6,121)          
Reclassification from redeemable noncontrolling interest to noncontrolling interests                         (835)          
Redeemable Noncontrolling Interest - ending balance                       $ 0 0 6,886 $ 15,473      
Eastern Airways [Member] | Subsequent Event [Member]                                    
Noncontrolling Interest [Line Items]                                    
Disposal Group, Not Discontinued Operation, Consideration Paid | £                     £ 17.1              
Purchase Covenants, Non Solicitation Of Key Employees Period                   12 months 12 months              
Purchase Covenants, Right To Appoint Observer To Board Of Directors Period                   12 months 12 months              
Purchase Covenants, Transition Services Coverage Period                   12 months 12 months              
Airnorth                                    
Noncontrolling Interest [Line Items]                                    
Ownership percentage by parent                       100.00%            
Number of aircraft operated | aircraft                       14            
Business acquisition, percentage of voting interests acquired 85.00%       15.00% 15.00%   85.00%                   85.00%
Acquisition cost               $ 24,000 $ 30.3                  
Payments for repurchase of redeemable noncontrolling interest         $ 5,300 $ 7.3                        
Acquisition of noncontrolling interest         (5,500)                          
Adjustments to Additional Paid in Capital, Other         2,600                          
Potential earn-out payments $ 13,000             $ 13,000                   $ 17.0
Business combination contingent consideration arrangement terms 4 years                                  
Payment of contingent consideration                             $ 1,500      
Redeemable noncontrolling interest [Abstract]                                    
Acquisition of noncontrolling interest         $ (5,500)                          
Eastern Airways                                    
Noncontrolling Interest [Line Items]                                    
Ownership percentage by parent                       100.00%            
Number of aircraft operated | aircraft                       31            
Business acquisition, percentage of voting interests acquired   60.00%                             40.00%  
Acquisition of noncontrolling interest                         (6,121)          
Business combination contingent consideration arrangement terms   3 years                                
Option indexed to issuer's equity, period   7 years                                
Number of aircraft providing technical support to | aircraft                       2            
Redeemable noncontrolling interest [Abstract]                                    
Redeemable Noncontrolling Interest - beginning balance     15,473             $ 0   $ 6,886 15,473          
Noncontrolling interest expense                       (4,093) (6,848)          
Currency translation                       4,163 (1,739)          
Acquisition of noncontrolling interest                         (6,121)          
Reclassification from redeemable noncontrolling interest to noncontrolling interests                       (835)            
Redeemable Noncontrolling Interest - ending balance                       $ 0 $ 6,886 $ 15,473        
Aviashelf Aviation                                    
Noncontrolling Interest [Line Items]                                    
Ownership percentage by parent                       48.50%            
Number of joint ventures | Affiliates                       2            
Option to acquire additional interest in affiliate                       8.50%            
Bristow Helicopter Leasing                                    
Noncontrolling Interest [Line Items]                                    
Ownership percentage by parent                       60.00%            
Sakhalin Bristow Air Services                                    
Noncontrolling Interest [Line Items]                                    
Ownership percentage by parent                       60.00%            
Lider                                    
Noncontrolling Interest [Line Items]                                    
Business acquisition, percentage of voting interests acquired                       20.00% 20.00%          
Cougar                                    
Noncontrolling Interest [Line Items]                                    
Business acquisition, percentage of voting interests acquired                       25.00% 25.00%          
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