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Capital Stock (Tables)
 12 Months Ended
Sep. 30, 2024
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, 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 
Vesting of restricted stock units, net of shares withheld for taxes207,986 
Exercise of stock options517,839 
Exercise of employee stock purchase plan instruments129,356 
Settlement of performance-based restricted stock units, net of shares withheld for taxes136,846 
Stock repurchased under buyback program(636,789)
Shares outstanding at September 30, 2024156,227,170