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Capital Stock (Details) - shares
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Outstanding Shares [Roll Forward]      
Shares outstanding 160,497,841 159,760,671 158,234,300
Exercised stock options 270,599 506,632 587,964
Exercise of employee stock purchase plan 218,475 212,550 204,360
Vesting of restricted stock units, net of shares withheld 370,138 541,839 734,047
Treasury Stock, Shares, Acquired   (523,851)  
Shares outstanding 161,693,051 160,497,841 159,760,671
Performance Shares [Member]      
Outstanding Shares [Roll Forward]      
Vesting of restricted stock units, net of shares withheld 335,998