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Capital Stock
 12 Months Ended
Sep. 30, 2022
Common Stock, Number of Shares, Par Value and Other Disclosure [Abstract]  
Stockholders' Equity Note Disclosure Capital Stock
Common stock share activity is presented below.

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 
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 

The Company has authorized 20.0 million shares of $0.01 par value preferred stock. The preferred stock may be issued in one or more series and with such designations and preferences for each series as shall be stated in the resolutions providing for the designation and issue of each such series adopted by the Board of Directors of the Company. The Board of Directors is authorized by the Company's articles of incorporation to determine the voting, dividend, redemption and liquidation preferences pertaining to each such series. No shares of preferred stock have been issued by the Company as of September 30, 2022.