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Earnings Per Share (Anti-dilutive Stock Options Excluded from Computation of Earnings Per Share) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
Mar. 31, 2011
Earnings Per Share        
Options 6 680 39 678
Weighted-average option price $ 40.60 $ 32.03 $ 34.63 $ 32.02