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Capital Stock
 12 Months Ended
Sep. 30, 2015
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]  
Stockholders' Equity Note Disclosure
Capital Stock
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