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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
 3 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options outstanding, Number of options 6,173 5,611
Options outstanding, Weighted-Average Exercise Price $ 49.40 $ 45.42
Options outstanding, Weighted-Average Remaining Life in Years 5 years 9 months 18 days  
Options outstanding, Aggregate Intrinsic Value $ 160,762  
Options vested and exercisable, Number of options 4,310  
Options vested and exercisable, Weighted-Average Exercise Price Per Share $ 40.19  
Options vested and exercisable, Weighted-Average Remaining Life in Years 4 years 7 months 6 days  
Options vested and exercisable, Aggregate Intrinsic Value $ 147,826  
Options vested and expected to vest, Number of options 6,074  
Options vested and expected to vest, Weighted-Average Exercise Price Per Share $ 48.99  
Options vested and expected to vest, Weighted-Average Remaining Life in Years 5 years 9 months 18 days  
Options vested and expected to vest, Aggregate Intrinsic Value $ 160,384