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Stockholders' Equity (Stock Options Vested, or Expected to Vest and Exercisable) (Details) - Stock Options [Member] - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Options outstanding, Number of options 5,443 5,387
Options vested and exercisable, Number of options 3,365  
Options vested and expected to vest, Number of options 5,362  
Options outstanding, Weighted-Average Exercise Price $ 62.00 $ 53.73
Options vested and exercisable, Weighted-Average Exercise Price Per Share 49.63  
Options vested and expected to vest, Weighted-Average Exercise Price Per Share $ 61.72  
Options outstanding, Weighted-Average Remaining Life in Years 6 years  
Options vested and exercisable, Weighted-Average Remaining Life in Years 4 years 7 months 6 days  
Options vested and expected to vest, Weighted-Average Remaining Life in Years 5 years 10 months 25 days  
Options outstanding, Aggregate Intrinsic Value $ 114,139  
Options vested and exercisable, Aggregate Intrinsic Value 103,059  
Options vested and expected to vest, Aggregate Intrinsic Value $ 113,399