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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2018 | Apr. 30, 2018 | Jan. 31, 2018 | Apr. 30, 2018
Income Taxes [Line Items] |  |  |  |
Effective tax rate | 21.00% | 29.73% | 35.00% | 33.33%
Deferred income tax expense |  |  |  | $ 680,000
Tax Cuts and Jobs Act, transition tax for accumulated unrepatriated foreign earnings, provisional income tax expense |  |  |  | 649,000
Tax Cuts and Jobs Act, transition tax for accumulated unrepatriated foreign earnings, provisional income tax liability | $ 546,000 | $ 546,000 |  | $ 546,000
Tax Cuts and Jobs Act, transition tax for accumulated unrepatriated foreign earnings, payment period |  |  |  | 8 years
State tax credit carry forward | 221,000 | 221,000 |  | $ 221,000
State tax credit carry forwards, expiration beginning date |  |  |  | 2018
Gross net operating losses | 1,240,000 | 1,240,000 |  | $ 1,240,000
Gross net operating losses subject to expiration | $ 624,000 | $ 624,000 |  | 624,000
Valuation allowance |  |  |  | $ 175,000
Minimum [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Gross net operating losses expiration year |  |  |  | 2020
Federal, state and local tax returns period |  |  |  | 3 years
Foreign subsidiaries tax returns period |  |  |  | 3 years
Maximum [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Gross net operating losses expiration year |  |  |  | 2023
Federal, state and local tax returns period |  |  |  | 4 years
Foreign subsidiaries tax returns period |  |  |  | 7 years

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