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Capital Stock (Tables) | 12 Months Ended
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Sep. 30, 2021
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |
Schedule of Common Stock Outstanding Roll Forward [Table Text Block] | Common stock share activity is presented below.
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 |
Vesting of restricted stock units, net of shares withheld for taxes | 182,024 |
Exercise of stock options | 151,399 |
Exercise of employee stock purchase plan instruments | 146,135 |
Settlement of performance-based restricted stock units, net of shares withheld for taxes | 62,396 |
Stock repurchased under buyback program | (651,271) |
Shares outstanding at September 30, 2021 | 157,955,433 |

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- Definition Tabular disclosure of the change in common stock outstanding. + References No definition available. + Details
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