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Net Income Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Earnings Per Share [Abstract]        
Basic earnings per share, Net income $ 25,811 $ 34,774 $ 106,348 $ 117,203
Basic earnings per share (in dollars per share) $ 0.44 $ 0.60 $ 1.82 $ 2.03
Diluted earnings per share, Net income $ 25,811 $ 34,774 $ 106,348 $ 117,203
Diluted earnings per share (in dollars per share) $ 0.44 $ 0.59 $ 1.80 $ 2.00
Weighted-average number of shares outstanding - Basic (in shares) 58,596 58,038 58,514 57,765
Effect of dilutive securities (in shares) 481 783 487 932
Weighted-average number of shares outstanding - Diluted (in shares) 59,077 58,821 59,001 58,697
Excluded as anti-dilutive (in shares) 1,213 [1] 448 [1] 1,108 [1] 239 [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.