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Income Taxes (Details 3) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2016 | Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2016
Income Taxes [Abstract] |  |  |  |
U.S. federal income tax at statutory rate |  | $ (2,186) | $ (2,667) | $ (10,314)
Transition tax on foreign earnings |  | (3,360) |  |
Valuation allowance |  | 58,798 | 626 |
Foreign tax rate differential |  | (4,272) | 3,107 | 6,035
Nondeductible expenses |  | 213 | 457 | 487
Other |  | (23) | 64 | (67)
Prior year tax benefit (expense) |  | 575 | 494 | (231)
U.S. federal tax law change |  | (52,631) |  |
State and local income tax, net of federal benefit |  | (16) | (60) | (20)
(PROVISION FOR) BENEFIT FROM INCOME TAXES | $ 16,600 | $ (2,902) | $ 2,021 | $ (4,110)

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