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Segments and Other Geographic Information (Details) (USD $) In Thousands, unless otherwise specified | 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
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
Number of Reportable Segments After Integrated |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Sales Revenue, Net | $ 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
Non-current Assets | 621,775 |  |  |  |  |  |  |  | 592,298 |  |  |  | 621,775 | 592,298 |
United States |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Revenue, Net |  |  |  |  |  |  |  |  |  |  |  |  | 674,742 | 602,794 | 591,284
Non-current Assets | 521,558 |  |  |  |  |  |  |  | 511,362 |  |  |  | 521,558 | 511,362 |
Canada |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Revenue, Net |  |  |  |  |  |  |  |  |  |  |  |  | 6,532 | 5,635 | 4,733
Non-current Assets | 4,579 |  |  |  |  |  |  |  | 4,925 |  |  |  | 4,579 | 4,925 |
North America |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Revenue, Net |  |  |  |  |  |  |  |  |  |  |  |  | 681,274 | 608,429 | 596,017
Non-current Assets | 526,137 |  |  |  |  |  |  |  | 516,287 |  |  |  | 526,137 | 516,287 |
United Kingdom |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Revenue, Net |  |  |  |  |  |  |  |  |  |  |  |  | 190,972 | 164,450 | 147,065
Non-current Assets | $ 95,638 |  |  |  |  |  |  |  | $ 76,011 |  |  |  | $ 95,638 | $ 76,011 |
[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.

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