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Capital Stock Tables
9 Months Ended
Jun. 30, 2017
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]  
Schedule of Stock by Class [Table Text Block]
Common stock share activity is presented below.
Shares outstanding at September 30, 2016
161,693,051

Shares repurchased
(4,581,227
)
Exercise of stock options
872,452

Vesting of restricted stock units, net of shares withheld for taxes
256,155

Settlement of performance-based restricted stock units, net of shares withheld for taxes
160,063

Exercise of employee stock purchase plan instruments
113,693

Shares outstanding at June 30, 2017
158,514,187