Capital Stock

12 Months Ended

Sep. 30, 2020

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, 2017	158,590,383
Vesting of restricted stock units, net of shares withheld for taxes	232,875
Exercise of stock options	851,628
Exercise of employee stock purchase plan instruments	150,669
Settlement of performance-based restricted stock units, net of shares withheld for taxes	86,516
Stock repurchased under buyback program	(2,573,475)
Other	(6,475)
Shares outstanding at September 30, 2018	157,332,121
Vesting of restricted stock units, net of shares withheld for taxes	200,431
Exercise of stock options	726,636
Exercise of employee stock purchase plan instruments	167,806
Settlement of performance-based restricted stock units, net of shares withheld for taxes	109,380
Stock repurchased under buyback program	(1,074,234)
Shares outstanding at September 30, 2019	157,462,140
Vesting of restricted stock units, net of shares withheld for taxes	242,112
Exercise of stock options	534,291
Exercise of employee stock purchase plan instruments	182,971
Settlement of performance-based restricted stock units, net of shares withheld for taxes	61,610
Stock repurchased under buyback program	(418,374)
Shares outstanding at September 30, 2020	158,064,750