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Earnings per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Net Components of Basic and Diluted Earnings per Share    
Net income (A) $ 39,352 $ 27,429
Weighted average outstanding shares of common stock (B) 50,355 49,698
Dilutive effect of stock options and restricted stock 338 421
Weighted average common stock and common stock equivalents (C) 50,693 50,119
Basic earnings per share (A/B) $ 0.78 $ 0.55
Diluted earnings per share (A/C) $ 0.78 $ 0.55
Potential common shares excluded from the calculation of diluted earnings per share 10