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Revenue Recognition and Contracts with Customers - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Apr. 30, 2019 | Oct. 31, 2019 | Jul. 31, 2019 | Oct. 31, 2018 | Jul. 31, 2018 | Oct. 31, 2019 | Oct. 31, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Deferred revenue recognized | $ 10,500 |  |  |  |  | $ 22,300 | $ 26,300
Additional deferred revenue for outstanding performance obligations |  |  |  |  |  | 15,600 | 12,000
Net increase of revenue |  |  |  |  |  | $ 6,700 | $ 14,300
ASU 2014-09 |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Deferred revenue recognized |  | $ 7,716 | $ 14,571 | $ 12,337 | $ 13,998 |  |
Additional deferred revenue for outstanding performance obligations |  | $ 10,104 | $ 5,472 | $ 7,667 | $ 4,314 |  |
Total Net Sales | ASU 2014-09 | Geographic Concentration Risk | Domestic |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  | 95.00% |

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