XML 11 R39.htm IDEA: XBRL DOCUMENT v2.4.0.6
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
Net Components of Basic and Diluted Earnings per Share        
Net income $ 37,261 $ 31,838 $ 76,613 $ 59,267
Weighted average outstanding shares of common stock 50,794 49,924 50,573 49,810
Dilutive effect of stock options and restricted stock 275 438 314 433
Weighted average common stock and common stock equivalents 51,069 50,362 50,887 50,243
Basic earnings per share $ 0.73 $ 0.64 $ 1.51 $ 1.19
Diluted earnings per share $ 0.73 $ 0.63 $ 1.51 $ 1.18
Potential common shares excluded from the calculation of diluted earnings per share   1   2