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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, 2018
Dec. 31, 2017
Sep. 30, 2017
Stock-Based Compensation      
Options outstanding, Number of options 5,880 5,937 5,236
Options outstanding, Weighted-Average Exercise Price $ 44.62 $ 44.48 $ 39.58
Options outstanding, Weighted-Average Remaining Life in Years 5 years 10 months 24 days    
Options outstanding, Aggregate Intrinsic Value $ 155,908    
Options vested and exercisable, Number of options 3,858    
Options vested and exercisable, Weighted-Average Exercise Price Per Share $ 35.68    
Options vested and exercisable, Weighted-Average Remaining Life in Years 4 years 7 months 6 days    
Options vested and exercisable, Aggregate Intrinsic Value $ 132,401    
Options vested and expected to vest, Number of options 5,782    
Options vested and expected to vest, Weighted-Average Exercise Price Per Share $ 44.25    
Options vested and to expected vest, Weighted-Average Remaining Life in Years 5 years 10 months 24 days    
Options vested and expected to vest, Aggregate Intrinsic Value $ 155,118