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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
 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Stock-Based Compensation    
Options outstanding, Number of options 5,611 5,236
Options outstanding, Weighted-Average Exercise Price $ 45.42 $ 39.58
Options outstanding, Weighted-Average Remaining Life in Years 5 years 7 months 6 days  
Options outstanding, Aggregate Intrinsic Value $ 198,843  
Options vested and exercisable, Number of options 3,623  
Options vested and exercisable, Weighted-Average Exercise Price Per Share $ 36.50  
Options vested and exercisable, Weighted-Average Remaining Life in Years 4 years 3 months 18 days  
Options vested and exercisable, Aggregate Intrinsic Value $ 160,703  
Options vested and expected to vest, Number of options 5,551  
Options vested and expected to vest, Weighted-Average Exercise Price Per Share $ 45.17  
Options vested and to expected vest, Weighted-Average Remaining Life in Years 5 years 7 months 6 days  
Options vested and expected to vest, Aggregate Intrinsic Value $ 198,108