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Capital Stock (Tables)
 12 Months Ended
Sep. 30, 2023
Common Stock, Number of Shares, Par Value and Other Disclosure [Abstract]  
Schedule of Common Stock Outstanding Roll Forward [Table Text Block]
Common stock share activity is presented below.

Shares outstanding at September 30, 2020158,064,750 
Vesting of restricted stock units, net of shares withheld for taxes182,024 
Exercise of stock options151,399 
Exercise of employee stock purchase plan instruments146,135 
Settlement of performance-based restricted stock units, net of shares withheld for taxes62,396 
Stock repurchased under buyback program(651,271)
Shares outstanding at September 30, 2021157,955,433 
Vesting of restricted stock units, net of shares withheld for taxes195,156 
Exercise of stock options36,731 
Exercise of employee stock purchase plan instruments150,909 
Settlement of performance-based restricted stock units, net of shares withheld for taxes160,163 
Stock repurchased under buyback program(2,654,254)
Shares outstanding at September 30, 2022155,844,138 
Vesting of restricted stock units, net of shares withheld for taxes256,724 
Exercise of stock options110,989 
Exercise of employee stock purchase plan instruments181,483 
Settlement of performance-based restricted stock units, net of shares withheld for taxes193,428 
Stock repurchased under buyback program(714,830)
Shares outstanding at September 30, 2023155,871,932