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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2018 | Oct. 31, 2017 | Jan. 31, 2018
Income Taxes [Line Items] |  |  |  |  |
U.S. federal corporate income tax rate |  |  | 21.00% |  | 35.00%
Effective tax rate | 20.60% | 37.40% | 21.70% | 37.20% |
Provisional tax expense |  |  |  |  | $ 64,705
Maximum |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Measurement period to record provisional amounts |  |  | 1 year |  |

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