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Earnings per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2010
Earnings Per Share [Abstract]      
Net income $ 74,288 $ 73,523 $ 48,812
Denominator: Weighted-average shares, basic 27,362,000 26,872,000 26,605,000
Denominator: Dilutive effect of share-based payments 389,000 374,000 264,000
Denominator: Weighted-average shares, diluted 27,751,000 27,246,000 26,869,000
Net income per common share, basic $ 2.72 $ 2.74 $ 1.83
Net income per common share, diluted $ 2.68 $ 2.70 $ 1.82
Weighted average shares excluded from the computation of diluted earnings per share 583,000 947,000 1,208,000