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Stockholders' Equity (Stock Options Vested, Or Expected to Vest and Are Exercisable) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 6 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Stock-Based Compensation      
Options outstanding, Number of options 5,429 5,636 4,641
Options outstanding, Weighted-Average Exercise Price $ 34.22 $ 33.81 $ 32.28
Options outstanding, Weighted-Average Remaining Life in Years 6 years 2 months 12 days    
Options outstanding, Aggregate Intrinsic Value $ 96,625    
Options vested and exercisable, Number of options 3,343    
Options vested and exercisable, Weighted-Average Exercise Price Per Share $ 29.66    
Options vested and exercisable, Weighted-Average Remaining Life in Years 4 years 7 months 6 days    
Options vested and exercisable, Aggregate Intrinsic Value $ 74,770    
Options vested and expected to vest, Number of options 5,296    
Options vested and expected to vest, Weighted-Average Exercise Price Per Share $ 34.03    
Options vested and to expected vest, Weighted-Average Remaining Life in Years 6 years 1 month 6 days    
Options vested and expected to vest, Aggregate Intrinsic Value $ 95,257