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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Jul. 31, 2014 | Jul. 31, 2013 | Jul. 31, 2012
Income Tax [Line Items] |  |  |
Tax credit carry forward | $ 790 | $ 547 |
Unrecognized tax benefits that, if recognized, would affect the company's income tax rate | 13,679 | 21,765 | 22,454
Tax positions related to prior years: Reductions | 9,281 | 113 | 284
Accrued interest and penalties | 5,200 | 11,671 | 13,265
Total amount of interest and penalties expense (benefit) recognized | (3,418) | (932) | 503
Expected decrease in unrecognized tax benefits due to resolution of uncertain tax positions | 2,560 |  |
Expected decrease in interest due to resolution of uncertain tax positions | 381 |  |
Expected decrease in penalties due to resolution of uncertain tax positions | 4 |  |
Minimum |  |  |
Income Tax [Line Items] |  |  |
Gross decrease in unrecognized tax benefit | 100 |  |
Decrease in interest and penalties | 150 |  |
Maximum |  |  |
Income Tax [Line Items] |  |  |
Gross decrease in unrecognized tax benefit | 3,100 |  |
Decrease in interest and penalties | 2,500 |  |
Discontinued Operations |  |  |
Income Tax [Line Items] |  |  |
Tax positions related to prior years: Reductions | 1,378 |  |
IRS |  |  |
Income Tax [Line Items] |  |  |
Tax audit assessments | 0 |  |
CALIFORNIA |  |  |
Income Tax [Line Items] |  |  |
Tax and interest paid to finalize tax audit for fiscal years 2007 and 2008 | 1,900 |  |
State and Local Jurisdiction |  |  |
Income Tax [Line Items] |  |  |
Tax credit carry forward | 1,873 |  |
Gross state tax Net Operating Loss carry forwards | 56,000 |  |
Deferred tax asset, Net Operating Loss carry forwards | $ 1,301 |  |
State and Local Jurisdiction | Minimum |  |  |
Income Tax [Line Items] |  |  |
Tax credit carry forward expiration year | 2022 |  |
Gross state tax Net Operating Loss carry forwards, expiration year | 2015 |  |
State and Local Jurisdiction | Maximum |  |  |
Income Tax [Line Items] |  |  |
Tax credit carry forward expiration year | 2024 |  |
Gross state tax Net Operating Loss carry forwards, expiration year | 2034 |  |

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