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Capital Stock (Tables) | 12 Months Ended
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Sep. 30, 2015
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, 2012 | 156,840,648 |
Exercise of stock options | 384,475 |
Exercise of employee stock purchase plan instruments | 290,173 |
Vesting of restricted stock units, net of shares withheld for taxes | 719,004 |
Shares outstanding at September 30, 2013 | 158,234,300 |
Exercise of employee stock purchase plan instruments | 204,360 |
Exercise of stock options | 587,964 |
Vesting of restricted stock units, net of shares withheld for taxes | 734,047 |
Shares outstanding at September 30, 2014 | 159,760,671 |
Exercise of employee stock purchase plan instruments | 212,550 |
Exercise of stock options | 506,632 |
Vesting of restricted stock units, net of shares withheld for taxes | 541,839 |
Stock repurchased under buyback program | (523,851 | )
Shares outstanding at September 30, 2015 | 160,497,841 |

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