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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Jul. 31, 2016 | Jul. 31, 2015 | Jul. 31, 2014
Income Tax [Line Items] |  |  |
Net current deferred tax assets |  | $ 59,864 |
Net long-term deferred income tax liabilities |  | 20,563 |
Unrecognized tax benefits that, if recognized, would affect the company's income tax rate | $ 8,886 | 8,764 | $ 13,679
Tax positions related to prior years: Reductions | 920 | 7,695 | 9,281
Accrued interest and penalties | 1,547 | 1,895 | 5,200
Total amount of interest and penalties expense (benefit) recognized | (231) | $ (2,552) | (3,418)
Expected decrease in unrecognized tax benefits due to resolution of uncertain tax positions | 5,193 |  |
Expected decrease in interest due to resolution of uncertain tax positions | 857 |  |
Discontinued Operations |  |  |
Income Tax [Line Items] |  |  |
Tax positions related to prior years: Reductions |  |  | $ 1,378
ASU 2015-17 | Reclassification adjustment |  |  |
Income Tax [Line Items] |  |  |
Net current deferred tax assets | 67,344 |  |
Net long-term deferred income tax liabilities | 13,927 |  |
State and Local Jurisdiction |  |  |
Income Tax [Line Items] |  |  |
Tax credit carry forward | 2,649 |  |
Gross state tax Net Operating Loss carry forwards | 45,500 |  |
Deferred tax asset, Net Operating Loss carry forwards | $ 973 |  |
State and Local Jurisdiction | Earliest Tax Year |  |  |
Income Tax [Line Items] |  |  |
Tax credit carry forward expiration year | 2022 |  |
Gross state tax Net Operating Loss carry forwards, expiration year | 2017 |  |
State and Local Jurisdiction | Latest Tax Year |  |  |
Income Tax [Line Items] |  |  |
Tax credit carry forward expiration year | 2026 |  |
Gross state tax Net Operating Loss carry forwards, expiration year | 2036 |  |

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