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Capital Stock (Details) - $ / shares
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Outstanding Shares [Roll Forward]      
Shares outstanding 155,844,138 157,955,433 158,064,750
Exercised stock options 110,989 36,731 151,399
Exercise of employee stock purchase plan 181,483 150,909 146,135
Vesting of restricted stock units, net of shares withheld for taxes 256,724 195,156 182,024
Shares outstanding 155,871,932 155,844,138 157,955,433
Stock repurchased under buyback program (714,830) (2,654,254) (651,271)
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period     62,396
Preferred stock, shares authorized (in shares) 60,000,000 60,000,000  
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01  
Preferred Stock, Shares Issued 0    
Performance Shares [Member]      
Outstanding Shares [Roll Forward]      
Settlement of performance-based restricted stock units, net of shares withheld for taxes 2 240,412,000,000 103,058,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period 193,428 160,163