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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 12 Months Ended
Jan. 31, 2015
USD ($)
Feb. 06, 2014
USD ($)
Nov. 30, 2015
USD ($)
Nov. 30, 2015
AUD ($)
Jan. 31, 2015
USD ($)
Jan. 31, 2015
AUD ($)
Mar. 31, 2018
USD ($)
Affiliates
aircraft
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Jan. 31, 2018
Jan. 31, 2015
AUD ($)
Feb. 06, 2014
GBP (£)
Noncontrolling Interest [Line Items]                        
Number of aircraft operated | aircraft             405          
Payments for repurchase of redeemable noncontrolling interest             $ 0 $ 0 $ 7,309      
Acquisition of noncontrolling interest             (6,121)   (5,467)      
Adjustments to Additional Paid in Capital, Other             (40,393)          
Payment of contingent consideration             0 10,000 9,453      
Redeemable noncontrolling interest [Abstract]                        
Redeemable Noncontrolling Interest - beginning balance             6,886 15,473 26,223      
Noncontrolling interest expense             (4,093) (6,848) (5,711)      
Accretion of noncontrolling interest                 1,498      
Currency translation             4,163 (1,739) (1,070)      
Acquisition of noncontrolling interest             (6,121)   (5,467)      
Reclassification from redeemable noncontrolling interest to noncontrolling interests             (835)          
Redeemable Noncontrolling Interest - ending balance             $ 0 $ 6,886 15,473      
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)           (5,467)      
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      
Contingent Consideration Period Payment               2 years 1 year      
Redeemable noncontrolling interest [Abstract]                        
Redeemable Noncontrolling Interest - beginning balance               $ 0 $ 3,339      
Noncontrolling interest expense                 788      
Accretion of noncontrolling interest                 1,498      
Currency translation                 (158)      
Acquisition of noncontrolling interest     $ (5,500)           (5,467)      
Redeemable Noncontrolling Interest - ending balance                 $ 0      
Airnorth | Call Option                        
Noncontrolling Interest [Line Items]                        
Option indexed to issuer's equity, period                 6 months      
Airnorth | Put option                        
Noncontrolling Interest [Line Items]                        
Option indexed to issuer's equity, period                 3 years      
Eastern Airways                        
Noncontrolling Interest [Line Items]                        
Ownership percentage by parent             100.00%          
Number of aircraft operated | aircraft             34          
Business acquisition, percentage of voting interests acquired   60.00%               40.00%   60.00%
Acquisition of noncontrolling interest             $ (6,121)          
Potential earn-out payments   $ 7,500                   £ 6
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             $ 6,886 15,473 $ 22,885      
Noncontrolling interest expense             (4,093) (6,848) (6,499)      
Currency translation             4,163 (1,739) (913)      
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%