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Segments and Other Geographic Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2012 | Apr. 30, 2012 | Jan. 31, 2012 | Oct. 31, 2011 | Jul. 31, 2011 | Apr. 30, 2011 | Jan. 31, 2011 | Oct. 30, 2010 | Jul. 31, 2012 | Jul. 31, 2011 | Jul. 31, 2010
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 226,556 | [1],[2] | $ 244,105 | [1],[2] | $ 227,904 | [1],[2] | $ 225,626 | [1],[2] | $ 215,443 | [1],[2],[3] | $ 236,755 | [1],[2],[3] | $ 207,380 | [1],[2],[3] | $ 212,667 | [1],[2],[3] | $ 924,191 | $ 872,246 | $ 772,879
Long-lived assets | 606,070 |  |  |  |  |  |  |  | 621,775 |  |  |  |  |  |  |  | 606,070 | 621,775 |
United States |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 724,869 | 674,742 | 602,794
Long-lived assets | 510,366 |  |  |  |  |  |  |  | 521,558 |  |  |  |  |  |  |  | 510,366 | 521,558 |
Canada |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,626 | 6,532 | 5,635
Long-lived assets | 4,161 |  |  |  |  |  |  |  | 4,579 |  |  |  |  |  |  |  | 4,161 | 4,579 |
North America |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 731,495 | 681,274 | 608,429
Long-lived assets | 514,527 |  |  |  |  |  |  |  | 526,137 |  |  |  |  |  |  |  | 514,527 | 526,137 |
United Kingdom |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 192,696 | 190,972 | 164,450
Long-lived assets | $ 91,543 |  |  |  |  |  |  |  | $ 95,638 |  |  |  |  |  |  |  | $ 91,543 | $ 95,638 |
[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] | All per share amounts have been revised to reflect the impact of the two-for-one stock split effected in the form of a stock dividend, which issued one additional share of common stock to each share of common stock outstanding on March 23, 2012.
[3] | Fiscal 2011 results are impacted from the adoption of ASU 2009-13.

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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 38 -Subparagraph b(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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