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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 5 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 31, 2018 | Dec. 31, 2017 | Jul. 31, 2018 | Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2016
Income Tax [Line Items] |  |  |  |  |  |
Corporate tax rate |  | 35.00% | 21.00% | 26.90% |  |
Unrecognized tax benefits that, if recognized, would affect the company's income tax rate | $ 10,491 |  | $ 10,491 | $ 10,491 | $ 8,477 | $ 8,886
Accrued interest and penalties | 1,290 |  | 1,290 | 1,290 | 1,209 |
Total amount of interest and penalties expense (benefit) recognized |  |  |  | 203 | $ (218) | $ (231)
Expected decrease in unrecognized tax benefits due to resolution of uncertain tax positions | 2,300 |  | 2,300 | 2,300 |  |
Expected decrease in interest due to resolution of uncertain tax positions |  |  |  | 450 |  |
State and Local Jurisdiction |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Tax credit carry forward | 996 |  | 996 | 996 |  |
Gross state tax Net Operating Loss carry forwards | 9,141 |  | 9,141 | 9,141 |  |
Deferred tax asset, Net Operating Loss carry forwards | 525 |  | $ 525 | $ 525 |  |
State and Local Jurisdiction | Earliest Tax Year |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Tax credit carry forward expiration year |  |  |  | 2027 |  |
Gross state tax Net Operating Loss carry forwards, expiration year |  |  |  | 2019 |  |
State and Local Jurisdiction | Latest Tax Year |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Tax credit carry forward expiration year |  |  |  | 2028 |  |
Gross state tax Net Operating Loss carry forwards, expiration year |  |  |  | 2038 |  |
Staff Accounting Bulletin Number 118 |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Measurement period |  |  |  | 1 year |  |
Provisional tax amount of additional deferred income tax expense |  |  |  | $ 34,000 |  |
Provisional tax amount of additional income tax expense | $ 2,000 |  |  |  |  |

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