Quarterly report pursuant to Section 13 or 15(d)

VARIABLE INTEREST ENTITIES AND OTHER INVESTMENTS IN SIGNIFICANT AFFILIATES - VIE Narrative (Details)

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VARIABLE INTEREST ENTITIES AND OTHER INVESTMENTS IN SIGNIFICANT AFFILIATES - VIE Narrative (Details)
£ / shares in Units, $ in Thousands, £ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 30, 2015
Jul. 31, 2014
Jun. 30, 2020
USD ($)
affiliate
Class_Of_Shares
Dec. 31, 2013
Mar. 31, 2020
USD ($)
Loan
Jun. 30, 2020
GBP (£)
Class_Of_Shares
Mar. 31, 2019
May 31, 2004
USD ($)
shares
May 31, 2004
£ / shares
Variable Interest Entity [Line Items]                  
Number of variable interest entities | affiliate     5            
Deferred interest accrued     $ 943   $ 832        
Bristow Helicopters Leasing Limited And Sakhalin Bristow Air Services Ltd                  
Variable Interest Entity [Line Items]                  
Noncontrolling ownership percentage             60.00%    
Bristow Aviation Holdings Limited | VIE, primary beneficiary                  
Variable Interest Entity [Line Items]                  
Ownership percentage in Variable Interest Entity     49.00%            
Number of class of shares | Class_Of_Shares     3     3      
Purchase of deferred stock shares (in shares) | shares               8,000,000  
Business acquisition share price (in USD per share) | £ / shares                 £ 1
Total amount paid for deferred shares               $ 14,400  
Principal amount of subordinated unsecured loan stock     $ 112,400     £ 91.0      
Interest rate on unsecured loan     13.50%            
Deferred interest accrued     $ 2,775,938   $ 2,697,878        
Call option price held by noncontrolling interest | £           £ 1.0      
Call option rate over LIBOR     3.00%     3.00%      
Bristow Helicopters Nigeria Ltd                  
Variable Interest Entity [Line Items]                  
Variable Interest Entity, Qualitative or Quantitative Information, Purchased Percentage From Third Party 8.00%                
Bristow Helicopters Nigeria Ltd | VIE, primary beneficiary                  
Variable Interest Entity [Line Items]                  
Ownership percentage in Variable Interest Entity     48.00%            
Pan African Airlines Nigeria Ltd | VIE, primary beneficiary                  
Variable Interest Entity [Line Items]                  
Ownership percentage in Variable Interest Entity     50.17%            
Impigra Aviation Holdings Limited | VIE, primary beneficiary                  
Variable Interest Entity [Line Items]                  
Ownership percentage in Variable Interest Entity     100.00%            
Impigra Aviation Holdings Limited | Bristow Aviation Holdings Limited                  
Variable Interest Entity [Line Items]                  
Ownership percentage in Variable Interest Entity     51.00%   51.00%        
Number of loans | Loan         2        
Nigerian Company | Bristow Helicopters Nigeria Ltd                  
Variable Interest Entity [Line Items]                  
Ownership percentage in Variable Interest Entity     50.00% 19.00%          
Variable Interest Entity, Qualitative or Quantitative Information, Purchased Percentage From Third Party 2.00% 29.00%              
Nigerian Employees | Nigerian Company                  
Variable Interest Entity [Line Items]                  
Noncontrolling ownership percentage     100.00%     100.00%      
Employee Trust Fund | Bristow Helicopters Nigeria Ltd                  
Variable Interest Entity [Line Items]                  
Ownership percentage in Variable Interest Entity     2.00%