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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
 9 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Stock-Based Compensation      
Options outstanding, Number of options 5,707 5,880 5,236
Options outstanding, Weighted-Average Exercise Price $ 45.20 $ 44.62 $ 39.58
Options outstanding, Weighted-Average Remaining Life in Years 5 years 9 months 18 days    
Options outstanding, Aggregate Intrinsic Value $ 182,230    
Options vested and exercisable, Number of options 3,699    
Options vested and exercisable, Weighted-Average Exercise Price Per Share $ 36.25    
Options vested and exercisable, Weighted-Average Remaining Life in Years 4 years 6 months    
Options vested and exercisable, Aggregate Intrinsic Value $ 150,207    
Options vested and expected to vest, Number of options 5,628    
Options vested and expected to vest, Weighted-Average Exercise Price Per Share $ 44.89    
Options vested and to expected vest, Weighted-Average Remaining Life in Years 5 years 8 months 12 days    
Options vested and expected to vest, Aggregate Intrinsic Value $ 181,384