Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' INVESTMENT, EARNINGS PER SHARE AND ACCUMULATED OTHER COMPREHENSIVE INCOME - Narrative (Details)

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STOCKHOLDERS' INVESTMENT, EARNINGS PER SHARE AND ACCUMULATED OTHER COMPREHENSIVE INCOME - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 11, 2020
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2021
Mar. 31, 2021
Sep. 16, 2020
Jun. 30, 2020
Jun. 10, 2020
Mar. 31, 2020
Oct. 31, 2019
Class of Stock [Line Items]                    
Stock repurchase program, authorized amount           $ 75,000,000        
Purchase of treasury shares (in shares)       1,480,804            
Purchase of treasury shares   $ 2,428,000 $ 7,579,000 $ 40,000,000            
Purchase of treasury shares (in dollars per share)       $ 27.02            
Stock repurchase program, remaining authorized repurchase amount       $ 25,000,000            
Mezzanine equity, initial fair value                   $ 618,900,000
Derivative liability                   470,300,000
Mezzanine equity, fair value   $ 0 $ 0 0 $ 1,572,000   $ 0   $ 149,785,000 148,600,000
Common stock       $ 303,000 $ 303,000          
Common stock, shares issued (in shares) 30,882,471             11,092,845    
Preferred stock, shares issued (in shares)               6,725,798    
Conversion rate of stock (in shares) 5.179562                  
Legacy Bristow stockholders                    
Class of Stock [Line Items]                    
Common stock, shares issued (in shares) 24,195,693                  
Carrying Value                    
Class of Stock [Line Items]                    
Derivative liability                   270,800,000
Common stock                   $ 270,700,000