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Net Income Per Share (Details) (USD $)
In Thousands, except Per Share data
 12 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2009
Net Income Per Share      
Net income $ 123,203 $ 89,212 $ 56,938
Basic earnings per share $ 2.16 $ 1.59 $ 1.09
Diluted earnings per share $ 2.11 $ 1.55 $ 1.07
Weighted average number of Common Shares outstanding-Basic 57,077 56,280 52,030
Effect of dilutive securities 1,183 1,105 1,241
Weighted average number of shares outstanding - Diluted 58,260 57,385 53,271
Excluded as anti-dilutive 48 [1] 577 [1] 87 [1]
[1] Represents options to purchase Common Shares excluded from the calculation of diluted net income per share because the exercise price of the stock options was greater than or equal to the average price of the Common Shares during the period.