Quarterly report pursuant to Section 13 or 15(d)

VARIABLE INTEREST ENTITIES AND OTHER INVESTMENTS IN SIGNIFICANT AFFILIATES - Loss on Sale of Subsidiaries Narrative (Details)

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VARIABLE INTEREST ENTITIES AND OTHER INVESTMENTS IN SIGNIFICANT AFFILIATES - Loss on Sale of Subsidiaries Narrative (Details)
$ in Thousands, £ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
May 10, 2019
GBP (£)
Jun. 30, 2019
USD ($)
Apr. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
affiliate
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Loss on sale of subsidiaries       $ 0 $ 56,303  
Eastern Airways            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Consideration paid | £ £ 17.1          
Non solicitation of key employees period 12 months          
Right to appoint observer to board of directors period 12 months          
Transition services coverage period 12 months          
Loss on sale of subsidiaries         46,852  
Write off of net assets         35,000  
Write off of cumulative translation adjustment         11,900  
Aviashelf Aviation Co.            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proceeds from divestiture of businesses   $ 2,600        
Bristow Helicopters Leasing Limited And Sakhalin Bristow Air Services Ltd            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proceeds from divestiture of businesses     $ 1,400      
Aviashelf and Bristow Helicopters Leasing Limited            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Loss on sale of subsidiaries         9,451  
Write off of net assets         2,300  
Write off of cumulative translation adjustment         $ 7,200  
Aviashelf Aviation Co.            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Noncontrolling ownership percentage           48.50%
Option to acquire additional interest in afiliate           8.50%
Bristow Helicopters Leasing Limited And Sakhalin Bristow Air Services Ltd            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Noncontrolling ownership percentage           60.00%
Number of joint ventures | affiliate           2