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Common Shares and Share-Based Compensation (Tables)
6 Months Ended
Mar. 31, 2022
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]  
Schedule Of Basic And Diluted Earnings Per Share Reconciliation
Three Months Ended
March 31,
Six Months Ended
March 31,
 2021 2022 2021 2022 
Basic shares outstanding599.4 593.3 599.0 593.9 
Dilutive shares3.4 3.2 3.3 3.4 
Diluted shares outstanding602.8 596.5 602.3 597.3