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Net Income Per Share (Tables) | 9 Months Ended
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Mar. 31, 2012
Earnings Per Share [Abstract] |
Schedule Of Net Income Per Share |
| Three Months Ended March 31, |  | Nine Months Ended March 31,
| 2012 |  | 2011 |  | 2012 |  | 2011
Basic earnings per share |  |  |  |  |  |  |
Net income | $ | 34,774 |  |  | $ | 35,830 |  |  | $ | 117,203 |  |  | $ | 94,611 |
Basic earnings per share | $ | 0.60 |  |  | $ | 0.63 |  |  | $ | 2.03 |  |  | $ | 1.66 |
Diluted earnings per share |  |  |  |  |  |  |
Net income | $ | 34,774 |  |  | $ | 35,830 |  |  | $ | 117,203 |  |  | $ | 94,611 |
Diluted earnings per share | $ | 0.59 |  |  | $ | 0.61 |  |  | $ | 2.00 |  |  | $ | 1.63 |
Weighted average number of shares outstanding |  |  |  |  |  |  |
Basic | 58,038 |  |  | 57,133 |  |  | 57,765 |  |  | 57,010 |
Effect of dilutive securities | 783 |  |  | 1,226 |  |  | 932 |  |  | 1,122 |
Diluted | 58,821 |  |  | 58,359 |  |  | 58,697 |  |  | 58,132 |
Excluded as anti-dilutive* | 448 |  |  | 124 |  |  | 239 |  |  | 57 |
* 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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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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