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Net Income Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Net Income Per Share [Abstract]        
Net income $ 47,443 $ 37,110 $ 82,429 $ 58,781
Basic earnings per share $ 0.82 $ 0.65 $ 1.43 $ 1.03
Diluted earnings per share, Net income $ 47,443 $ 37,110 $ 82,429 $ 58,781
Diluted earnings per share $ 0.81 $ 0.64 $ 1.41 $ 1.01
Weighted average number of shares outstanding - Basic 57,846 57,019 57,642 56,950
Effect of dilutive securities 826 1,069 1,005 1,057
Weighted average number of shares outstanding - Diluted 58,672 58,088 58,647 58,007
Excluded as anti-dilutive 189 [1] 347 [1] 137 [1] 271 [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.