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Quarterly Information (Details) (USD $) In Thousands, except Per Share data | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2011 | Apr. 30, 2011 | Jan. 31, 2011 | Oct. 31, 2010 | Jul. 31, 2010 | Apr. 30, 2010 | Jan. 31, 2010 | Oct. 31, 2009 | Jul. 31, 2011 | Jul. 31, 2010 | Jul. 31, 2009
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 215,443 | [1] | $ 236,755 | [1] | $ 207,380 | [1] | $ 212,667 | [1] | $ 190,468 |  | $ 220,349 |  | $ 176,601 |  | $ 185,461 |  | $ 872,246 | $ 772,879 | $ 743,082
Operating income | 63,456 | [1] | 82,044 | [1] | 60,195 | [1] | 59,594 | [1] | 57,220 |  | 72,126 |  | 53,232 |  | 56,492 |  | 265,290 | 239,070 | 225,325
Income from continuing operations | 62,645 | [1] | 80,350 | [1] | 60,717 | [1] | 60,163 | [1] | 57,687 |  | 71,584 |  | 53,172 |  | 57,052 |  |  |  |
Net income | $ 40,521 | [1] | $ 50,136 | [1] | $ 37,893 | [1] | $ 37,823 | [1] | $ 36,234 |  | $ 44,390 |  | $ 35,733 |  | $ 35,270 |  |  |  |
Basic net income per share (in dollars per share) | $ 0.60 | [1],[2] | $ 0.72 | [1],[2] | $ 0.47 | [1],[2] | $ 0.45 | [1],[2] | $ 0.43 | [2] | $ 0.53 | [2] | $ 0.42 | [2] | $ 0.42 | [2] | $ 2.20 | $ 1.80 | $ 1.69
Diluted net income per share (in dollars per share) | $ 0.59 | [1],[2] | $ 0.71 | [1],[2] | $ 0.46 | [1],[2] | $ 0.45 | [1],[2] | $ 0.43 | [2] | $ 0.52 | [2] | $ 0.42 | [2] | $ 0.42 | [2] | $ 2.17 | $ 1.78 | $ 1.66
[1] | Earnings per share were computed independently for each of the periods presented; therefore, the sum of the earnings per share amounts for the quarters may not equal the total for the year.
[2] | Fiscal 2011 results are impacted from the adoption of ASU 2009-13.

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