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Summary of Significant Accounting Policies - Shares Used in Computing Basic and Diluted Earnings Per Share (Details) - shares
shares in Thousands
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Accounting Policies [Abstract]      
Weighted-average common shares outstanding for basic computation (in shares) 173,154 173,115 172,733
Incremental shares issuable for stock options and common stock awards (in shares) [1] 2,418 2,552 2,498
Weighted-average common shares outstanding for diluted computation (in shares) 175,572 175,667 175,231
Antidilutive securities excluded from computation of earnings per share (in shares) 38 1 0
[1] For Fiscal 2016, Fiscal 2015 and Fiscal 2014, there were 38 shares, 1 share and 0 shares, respectively, associated with outstanding stock option awards that were not included in the computation of diluted earnings per share above because their effect was antidilutive.