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Earnings Per Share (Schedule Of Earnings Per Share) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
Mar. 31, 2011
Earnings Per Share [Abstract]        
Net Income $ 14,756 $ 16,534 $ 54,503 $ 53,862
Weighted-average shares, basic 27,489,000 26,938,000 27,290,000 26,811,000
Dilutive effect of share-based payments 437,000 475,000 419,000 371,000
Weighted-average shares, diluted 27,926,000 27,413,000 27,709,000 27,182,000
Net income per common share, basic $ 0.54 $ 0.61 $ 2.00 $ 2.01
Net income per common share, diluted $ 0.53 $ 0.60 $ 1.97 $ 1.98
Weighted average shares excluded from the computation of diluted earnings per share 260,901 475,289 597,872 371,253