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Capital Stock (Tables) | 12 Months Ended
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Sep. 30, 2017
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, 2014 | 159,760,671 |
Vesting of restricted stock units, net of shares withheld for taxes | 541,839 |
Exercise of stock options | 506,632 |
Exercise of employee stock purchase plan instruments | 212,550 |
Stock repurchased under buyback program | (523,851 | )
Shares outstanding at September 30, 2015 | 160,497,841 |
Vesting of restricted stock units, net of shares withheld for taxes | 370,138 |
Settlement of performance-based restricted stock units, net of shares withheld for taxes | 335,998 |
Exercise of stock options | 270,599 |
Exercise of employee stock purchase plan instruments | 218,475 |
Shares outstanding at September 30, 2016 | 161,693,051 |
Exercise of employee stock purchase plan instruments | 150,174 |
Exercise of stock options | 905,834 |
Vesting of restricted stock units, net of shares withheld for taxes | 262,488 |
Settlement of performance-based restricted stock units, net of shares withheld for taxes | 160,063 |
Stock repurchased under buyback program | (4,581,227 | )
Shares outstanding at September 30, 2017 | 158,590,383 |

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