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Capital Stock (Tables)
 12 Months Ended
Sep. 30, 2018
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, 2015
160,497,841

Vesting of restricted stock units, net of shares withheld for taxes
370,138

Exercise of stock options
270,599

Exercise of employee stock purchase plan instruments
218,475

Settlement of performance-based restricted stock units, net of shares withheld for taxes
335,998

Shares outstanding at September 30, 2016
161,693,051

Vesting of restricted stock units, net of shares withheld for taxes
262,488

Exercise of stock options
905,834

Exercise of employee stock purchase plan instruments
150,174

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

Vesting of restricted stock units, net of shares withheld for taxes
232,875

Exercise of stock options
851,628

Exercise of employee stock purchase plan instruments
150,669

Settlement of performance-based restricted stock units, net of shares withheld for taxes
86,516

Stock repurchased under buyback program
(2,573,475
)
Other
(6,475
)
Shares outstanding at September 30, 2018
157,332,121