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Stockholders' Equity (Changes in Nonvested Stock Options) (Details)
shares in Thousands
 3 Months Ended
Dec. 31, 2015
$ / shares
shares
Stock-Based Compensation  
Number of Options, beginning balance | shares 1,724
Weighted-Average Exercise Price Per Share, beginning balance | $ / shares $ 40.54
Options granted, Number of options | shares 1,055
Options granted, Weighted-Average Exercise Price Per Share | $ / shares $ 40.26
Options vested, Number of options | shares (674)
Options vested, Weighted-Average Exercise Price Per Share | $ / shares $ 36.93
Options forfeited, Number of options | shares (11)
Options forfeited, Weighted-Average Exercise Price Per Share | $ / shares $ 43.54
Number of Options, ending balance | shares 2,094
Weighted-Average Exercise Price Per Share, ending balance | $ / shares $ 41.54