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Stock-Based Compensation (Activity for Stock Option Awards) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2012
Mar. 31, 2012
Stock-Based Compensation    
Number of options, beginning balance 4,858 4,228
Weighted Average Exercise Price Per Share, beginning balance $ 21.34 $ 20.12
Options granted, Number of options 20 845
Options granted, Weighted Average Exercise Price Per Share $ 43.27 $ 26.00
Options exercised, Number of options (205) (390)
Options exercised, Weighted Average Exercise Price Per Share $ 13.90 $ 12.86
Options forfeited, Number of options   (10)
Options forfeited, Weighted Average Exercise Price Per Share   $ 26.83
Number of options, ending balance 4,673 4,673
Weighted Average Exercise Price Per Share, ending balance $ 21.76 $ 21.76