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Provision for Income Taxes - Additional Information (Detail) (USD $) | 3 Months Ended
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Oct. 31, 2014 | Oct. 31, 2013
Income Tax [Line Items] |  |
Maximum percentage of tax benefits realized upon ultimate settlement | 50.00% |
Effective income tax rate | 30.90% | 33.10%
Decreases in unrecognized tax benefits resulting from effective settlement | $ 4,506 |
Income tax benefit related to gross uncertain tax benefit releases, net | 2,387 |
Interest and penalties related to uncertain tax benefits | 146 |
Expected decrease in unrecognized tax benefits due to resolution of uncertain tax positions | 2,560,000 |
Expected decrease in interest and penalties due to resolution of uncertain tax positions | 385,000 |
Minimum |  |
Income Tax [Line Items] |  |
Expected gross unrecognized tax benefits decrease | 100,000 |
Expected decrease in interest and penalties | 150,000 |
Maximum |  |
Income Tax [Line Items] |  |
Expected gross unrecognized tax benefits decrease | 2,700,000 |
Expected decrease in interest and penalties | $ 1,200,000 |

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