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Provision for Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2014 | Jan. 31, 2013
Income Tax [Line Items] |  |  |  |
Maximum percentage of tax benefits realized upon ultimate settlement |  |  | 50.00% |
Decreases in unrecognized tax benefits resulting from settlement | $ 4,041 |  | $ 5,683 |
Income tax benefit related to gross uncertain tax benefit releases, net | 1,624 |  | 2,632 |
Interest and penalties related to uncertain tax benefits | 291 |  | 586 |
Effective income tax rate | 28.00% | 22.20% | 31.60% | 30.40%
Expected decrease in unrecognized tax benefits due to resolution of uncertain tax positions |  |  | 3,660 |
Expected decrease in interest and penalties due to resolution of uncertain tax positions |  |  | 895 |
Minimum |  |  |  |
Income Tax [Line Items] |  |  |  |
Expected gross unrecognized tax benefits decrease |  |  | 900 |
Expected decrease in interest and penalties |  |  | 400 |
Maximum |  |  |  |
Income Tax [Line Items] |  |  |  |
Expected gross unrecognized tax benefits decrease |  |  | 6,500 |
Expected decrease in interest and penalties |  |  | $ 3,800 |

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