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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, 2021
Sep. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Options outstanding, Number of options 5,339 5,443
Options vested and exercisable, Number of options 3,276  
Options vested and expected to vest, Number of options 5,279  
Options outstanding, Weighted-Average Exercise Price $ 68.21 $ 62.00
Options vested and exercisable, Weighted-Average Exercise Price Per Share 58.95  
Options vested and expected to vest, Weighted-Average Exercise Price Per Share $ 68.06  
Options outstanding, Weighted-Average Remaining Life in Years 6 years  
Options vested and exercisable, Weighted-Average Remaining Life in Years 4 years 8 months 12 days  
Options vested and expected to vest, Weighted-Average Remaining Life in Years 6 years  
Options outstanding, Aggregate Intrinsic Value $ 240,483  
Options vested and exercisable, Aggregate Intrinsic Value 177,729  
Options vested and expected to vest, Aggregate Intrinsic Value $ 238,544