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Provision for Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Oct. 31, 2013 | Oct. 31, 2012
Income Tax [Line Items] |  |
Maximum percentage of tax benefits realized upon ultimate settlement | 50.00% |
Decreases in unrecognized tax benefits resulting from effective settlement | $ 1,642 |
Income tax benefit related to gross uncertain tax benefit releases, net | 1,008 |
Interest and penalties related to uncertain tax benefits | 295 |
Effective income tax rate | 33.10% | 34.90%
Expected decrease in unrecognized tax benefits due to resolution of uncertain tax positions | 3,920 |
Expected decrease in interest and penalties due to resolution of uncertain tax positions | 1,050 |
Minimum |  |
Income Tax [Line Items] |  |
Expected gross unrecognized tax benefits decrease | 3,400 |
Expected decrease in interest and penalties | 800 |
Maximum |  |
Income Tax [Line Items] |  |
Expected gross unrecognized tax benefits decrease | 7,200 |
Expected decrease in interest and penalties | $ 2,300 |

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