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Net Income Per Share (Details) (USD $) In Thousands, except Per Share data	3 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Net Income Per Share [Abstract]
Net income	$ 34,986	$ 21,671
Basic earnings per share	$ 0.61	$ 0.38
Diluted earnings per share, Net income	$ 34,986	$ 21,671
Diluted earnings per share	$ 0.60	$ 0.37
Weighted average number of Common Shares outstanding-basic	57,412	56,883
Effect of dilutive securities	1,187	1,039
Weighted average number of shares outstanding - Diluted	58,599	57,922
Excluded as anti-dilutive		272	[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.

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