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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, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Earnings Per Share [Abstract]        
Basic earnings per share, Net income $ 61,108 $ 47,443 $ 80,537 $ 82,429
Basic earnings per share (in dollars per share) $ 1.04 $ 0.82 $ 1.38 $ 1.43
Diluted earnings per share, Net income $ 61,108 $ 47,443 $ 80,537 $ 82,429
Diluted earnings per share (in dollars per share) $ 1.04 $ 0.81 $ 1.37 $ 1.41
Weighted-average number of shares outstanding - Basic (in shares) 58,503 57,846 58,473 57,642
Effect of dilutive securities (in shares) 480 826 488 1,005
Weighted-average number of shares outstanding - Diluted (in shares) 58,983 58,672 58,961 58,647
Excluded as anti-dilutive (in shares) 1,076 [1] 189 [1] 1,065 [1] 137 [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.