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Segments and Other Geographic Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2015 | [1] | Apr. 30, 2015 | [1] | Jan. 31, 2015 | [1] | Oct. 31, 2014 | [1] | Jul. 31, 2014 | [1] | Apr. 30, 2014 | [1] | Jan. 31, 2014 | [1] | Oct. 31, 2013 | [1] | Jul. 31, 2015 | Jul. 31, 2014 | Jul. 31, 2013
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 282,293 | $ 297,142 | $ 276,258 | $ 290,386 | $ 287,450 | $ 309,722 | $ 286,434 | $ 279,883 | $ 1,146,079 | $ 1,163,489 | $ 1,046,386
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 21,813 | 24,244 | 11,170
International |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 243,199 | 269,915 | 228,945
Operating segments | North America |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 914,443 | 904,000 | 826,030
Operating segments | United Kingdom |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 209,823 | $ 235,245 | $ 209,186
[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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