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Shareholders' Equity (Tables)
12 Months Ended
Sep. 30, 2023
Stockholders' Equity Note [Abstract]  
Schedule Of Shares Reserved For Future Issuance Class A shares and Class B shares reserved for issuance at September 30, 2023 are as follows:
  
Shares
Conversion of Class B to Class A shares7,457,369 
Employee Stock Purchase Plan1,310,543 
2014 Long Term Incentive Plan1,662,796 
2008 Stock Appreciation Rights Plan1,035,822 
Class A and B shares reserved for issuance11,466,530