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Capital Stock
 12 Months Ended
Sep. 30, 2021
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]  
Stockholders' Equity Note Disclosure Capital Stock
Common stock share activity is presented below.

Shares outstanding at September 30, 2018157,332,121 
Vesting of restricted stock units, net of shares withheld for taxes200,431 
Exercise of stock options726,636 
Exercise of employee stock purchase plan instruments167,806 
Settlement of performance-based restricted stock units, net of shares withheld for taxes109,380 
Stock repurchased under buyback program(1,074,234)
Shares outstanding at September 30, 2019157,462,140 
Vesting of restricted stock units, net of shares withheld for taxes242,112 
Exercise of stock options534,291 
Exercise of employee stock purchase plan instruments182,971 
Settlement of performance-based restricted stock units, net of shares withheld for taxes61,610 
Stock repurchased under buyback program(418,374)
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