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Stockholders' Equity (Activity for Stock Option Awards) (Details)
shares in Thousands
 12 Months Ended
Sep. 30, 2016
$ / shares
shares
Stock-Based Compensation  
Number of options, beginning balance | shares 4,641
Weighted Average Exercise Price Per Share, beginning balance | $ / shares $ 32.28
Options granted, Number of options | shares 1,055
Options granted, Weighted Average Exercise Price Per Share | $ / shares $ 40.26
Options exercised, Number of options | shares (732)
Options exercised, Weighted Average Exercise Price Per Share | $ / shares $ 22.74
Options forfeited, Number of options | shares (20)
Options forfeited, Weighted Average Exercise Price Per Share | $ / shares $ 42.75
Number of options, ending balance | shares 4,944
Weighted Average Exercise Price Per Share, ending balance | $ / shares $ 35.35