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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Earnings Per Share [Abstract]        
Net Income $ 21,367 $ 21,621 $ 39,746 $ 37,328
Weighted-average shares, basic 27,244,000 26,786,000 27,191,000 26,749,000
Dilutive effect of share-based payments 430,000 374,000 413,000 319,000
Weighted-average shares, diluted 27,674,000 27,160,000 27,604,000 27,068,000
Net income per common share, basic $ 0.78 $ 0.81 $ 1.46 $ 1.40
Net income per common share, diluted $ 0.77 $ 0.80 $ 1.44 $ 1.38
Weighted average shares excluded from the computation of diluted earnings per share 622,247 968,297 722,315 1,139,717