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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
 3 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Stock-Based Compensation    
Options outstanding, Number of options 5,636 4,641
Options outstanding, Weighted-Average Exercise Price $ 33.81 $ 32.28
Options outstanding, Weighted-Average Remaining Life in Years 6 years 2 months 12 days  
Options outstanding, Aggregate Intrinsic Value $ 89,364  
Options vested and exercisable, Number of options 3,543  
Options vested and exercisable, Weighted-Average Exercise Price Per Share $ 29.23  
Options vested and exercisable, Weighted-Average Remaining Life in Years 4 years 7 months 6 days  
Options vested and exercisable, Aggregate Intrinsic Value $ 72,368  
Options vested and expected to vest, Number of options 5,479  
Options vested and expected to vest, Weighted-Average Exercise Price Per Share $ 33.58  
Options vested and to expected vest, Weighted-Average Remaining Life in Years 6 years 2 months 12 days  
Options vested and expected to vest, Aggregate Intrinsic Value $ 88,107