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Components of Total Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2016 | Jul. 31, 2015
Income Tax Disclosure [Abstract] |  |  |  |
Unrecognized tax benefits | $ 13,004 | $ 12,671 | $ 13,269 | $ 13,156
Reduction to unrecognized tax benefits for tax credit carry forward | (955) | (1,882) |  |
Accrued interest and penalties | 1,290 | 1,209 |  |
Total unrecognized tax benefits | 13,339 | 11,998 |  |
Short-term, included in "Income and other taxes" | 893 | 1,735 |  |
Long-term | 12,446 | 10,263 |  |
Total unrecognized tax benefits | $ 13,339 | $ 11,998 |  |

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