Quarterly report pursuant to Section 13 or 15(d)

Equity (Details)

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Equity (Details)
 3 Months Ended 9 Months Ended
Jun. 30, 2021
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Mar. 31, 2021
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Jun. 30, 2020
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Dec. 31, 2019
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Jun. 30, 2021
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Class A Common Stock          
Schedule Of Stockholders Equity [Line Items]          
Voting rights per share | voting_right 1       1
Class A Common Stock | Restricted Stock | Equity Incentive Plan          
Schedule Of Stockholders Equity [Line Items]          
Options granted (in shares) 510,733 510,733      
Class A Common Stock | Common Stock          
Schedule Of Stockholders Equity [Line Items]          
Converted shares (in shares) 787,001 1,332,952 724,946 107,682  
Stock split, conversion ratio         1
Outstanding shares (in shares) 36,506,570       36,506,570
Options granted (in shares)   510,733      
Class B Common Stock          
Schedule Of Stockholders Equity [Line Items]          
Voting rights per share | voting_right 10       10
Class B Common Stock | Common Stock          
Schedule Of Stockholders Equity [Line Items]          
Converted shares (in shares) (787,001) (1,332,952) (724,946) (107,682)  
Outstanding shares (in shares) 15,785,908       15,785,908