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Net Income Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2011
Earnings Per Share [Abstract]      
Basic earnings per share, Net income $ 148,520 $ 125,174 $ 123,203
Basic earnings per share (in dollars per share) $ 2.53 $ 2.16 $ 2.16
Diluted earnings per share, Net income $ 148,520 $ 125,174 $ 123,203
Diluted earnings per share (in dollars per share) $ 2.51 $ 2.13 $ 2.11
Weighted-average number of shares outstanding - Basic (in shares) 58,604 57,890 57,077
Effect of dilutive securities (in shares) 458 844 1,183
Weighted-average number of shares outstanding - Diluted (in shares) 59,062 58,734 58,260
Excluded as anti-dilutive (in shares) 1,131 [1] 368 [1] 48 [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.