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Income Taxes - Components of Total Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands | Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2016
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Income Tax Disclosure [Abstract] |  |  |  |
Unrecognized tax benefits | $ 13,848 | $ 13,004 | $ 12,671 | $ 13,269
Reduction to unrecognized tax benefits which offset tax credit and loss carryforwards | (1,916) | (955) |  |
Accrued interest and penalties | 1,758 | 1,290 |  |
Total unrecognized tax benefits | 13,690 | 13,339 |  |
Short-term, included in "Income and other taxes" | 2,891 | 893 |  |
Long-term | 10,799 | 12,446 |  |
Total unrecognized tax benefits | $ 13,690 | $ 13,339 |  |

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