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Provision for Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Apr. 30, 2014 | Apr. 30, 2013 | Apr. 30, 2014 | Apr. 30, 2013
Income Tax [Line Items] |  |  |  |
Maximum percentage of tax benefits realized upon ultimate settlement |  |  | 50.00% |
Effective income tax rate | 33.40% | 31.00% | 32.50% | 30.70%
Decreases in unrecognized tax benefits resulting from settlement | $ 760 |  | $ 6,443 |
Income tax benefit related to gross uncertain tax benefit releases, net | 694 |  | 3,326 |
Interest and penalties related to uncertain tax benefits | 281 |  | 868 |
Expected decrease in unrecognized tax benefits due to resolution of uncertain tax positions |  |  | 3,262 |
Expected decrease in interest and penalties due to resolution of uncertain tax positions |  |  | 798 |
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 |  |  | 6,300 |
Expected decrease in interest and penalties |  |  | $ 3,800 |

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