Quarterly report pursuant to Section 13 or 15(d)

SHARE-BASED COMPENSATION AND OTHER EMPLOYEE BENEFIT PLANS - Narrative (Details)

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SHARE-BASED COMPENSATION AND OTHER EMPLOYEE BENEFIT PLANS - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 5 Months Ended 6 Months Ended
Jun. 17, 2020
Jun. 11, 2020
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation         $ 7,192 $ 1,526
Expected employer contributions     $ 16,300   16,300  
Employer contributions         7,600  
2012 Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation     $ 2,000   $ 7,200  
Common Stock Options | Management Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted (in shares)       113,081    
Options vested (in shares)   48,448        
Options forfeited (in shares)   151,307        
Preferred Stock Options | Management Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted (in shares)       265,049    
Restricted stock awards | Management Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares)   656,617 218,088 188,210    
Shares vested (in shares)   73,131        
Shares forfeited (in shares)   227,884        
Grant date fair value (in dollars per share)     $ 19.41   $ 19.41  
Restricted stock awards | 2012 Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares consolidated from Era Group (in shares)   151,768        
Restricted Preferred Stock | Management Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares)       312,606    
Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options forfeited (in shares)   145,263        
Weighted average grant-date fair value of options granted (in dollars per share)         $ 10.99  
Stock options | Management Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted (in shares) 150,001 433,283 11,667      
Weighted average grant-date fair value of options granted (in dollars per share) $ 10.99   $ 14.56      
Performance restricted stock | Management Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares) 150,001          
Grant date fair value (in dollars per share) $ 7.73          
Vesting period 3 years