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 ($)
1 Months Ended 3 Months Ended
Jun. 11, 2020
Jul. 31, 2021
Jun. 30, 2021
Jun. 30, 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           $ 75,000,000.0        
Stock repurchased (in shares)     933,208              
Stock repurchased during period (in dollars per share)     $ 26.89              
Share repurchases     $ 25,100,000 $ 25,199,000            
Stock repurchase program, remaining authorized repurchase amount     39,900,000 39,900,000            
Mezzanine equity, initial fair value                   $ 618,900,000
Derivative liability                   470,300,000
Mezzanine equity, fair value     0 0 $ 1,572,000   $ 0   $ 149,785,000 148,600,000
Common stock     $ 303,000 $ 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
Subsequent Event                    
Class of Stock [Line Items]                    
Stock repurchased (in shares)   547,596                
Stock repurchased during period (in dollars per share)   $ 27.24                
Share repurchases   $ 14,900,000                
Stock repurchase program, remaining authorized repurchase amount   $ 25,000,000.0