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Capital Stock (Tables)

12 Months Ended

Sep. 30, 2016

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, 2013	158,234,300
Vesting of restricted stock units, net of shares withheld for taxes	734,047
Exercise of stock options	587,964
Exercise of employee stock purchase plan instruments	204,360
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

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Tabular disclosure of the change in common stock outstanding.

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