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Stock-Based Compensation (Stock Options Vested, Or Expected to Vest and Are Exercisable) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 6 Months Ended
Mar. 31, 2012
Y
Dec. 31, 2011
Sep. 30, 2011
Stock-Based Compensation      
Options outstanding, Number of options 4,673 4,858 4,228
Options outstanding, Weighted-Average Exercise Price $ 21.76 $ 21.34 $ 20.12
Options outstanding, Weighted-Average Remaining Life in Years 6.1    
Options outstanding, Aggregate Intrinsic Value $ 98,471    
Options vested and exercisable, Number of options 2,944    
Options vested and exercisable, Weighted-Average Exercise Price Per Share $ 18.69    
Options vested and exercisable, Weighted-Average Remaining Life in Years 4.5    
Options vested and exercisable, Aggregate Intrinsic Value 71,059    
Options vested and expected to vest, Number of options 4,505    
Options vested and expected to vest, Weighted-Average Exercise Price Per Share $ 21.55    
Options vested and to expected vest, Weighted-Average Remaining Life in Years 5.9    
Options vested and expected to vest, Aggregate Intrinsic Value $ 95,871