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Shareholders' Equity (Tables)
12 Months Ended
Sep. 30, 2017
Stockholders' Equity Note [Abstract]  
Schedule Of Shares Reserved For Future Issuance
Class A shares and Class B shares reserved for issuance at September 30, 2017 are as follows:
  
Shares
Conversion of Class B to Class A shares
7,575,427

Employee Stock Purchase Plan
2,000,000

2014 Long Term Incentive Plan
1,992,436

2008 Stock Appreciation Rights Plan
1,376,353

2003 Stock Option Plan
24,682

Class A and B shares reserved for issuance
12,968,898