Annual report pursuant to Section 13 and 15(d)

Equity-Based Compensation (Detail)

v3.20.2
Equity-Based Compensation (Detail)
1 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Aug. 31, 2019
$ / shares
shares
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
shares
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Aggregate grant date fair value $ 3,800,000     $ 3,800,000
Compensation expense     $ 1,600,000 500,000
Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense     0 $ 400,000
Conversion ratio   0.367    
Class A Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense $ 700,000      
Exercises in period, weighted average (in dollars per share) | $ / shares   $ 0.0357    
Class A Common Stock | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options granted (in shares) | shares       292,534
Unrecognized compensation expense     $ 1,700,000  
Class B Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options granted (in shares) | shares   74,592