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Common Shares and Share-Based Compensation
6 Months Ended
Mar. 31, 2023
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]  
Common Shares and Share-Based Compensation COMMON SHARES AND SHARE-BASED COMPENSATIONReconciliations of weighted-average shares for basic and diluted earnings per common share follow. Earnings allocated to participating securities were inconsequential.
Three Months Ended
March 31,
Six Months Ended
March 31,
 2022 2023 2022 2023 
Basic shares outstanding593.3 570.9 593.9 577.2 
Dilutive shares3.2 2.7 3.4 2.9 
Diluted shares outstanding596.5 573.6 597.3 580.1