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Revenue Recognition and Contracts with Customers - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Apr. 30, 2019 | May 01, 2018 | Jan. 31, 2020 | Oct. 31, 2019 | Jul. 31, 2019 | Jan. 31, 2019 | Oct. 31, 2018 | Jul. 31, 2018 | Jan. 31, 2020 | Jan. 31, 2019
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred revenue recognized | $ 10,500 | $ 22,600 |  |  |  |  |  |  | $ 31,800 | $ 36,600
Additional deferred revenue for outstanding performance obligations |  |  |  |  |  |  |  |  | 26,700 | 21,000
Net increase of revenue recognized |  |  |  |  |  |  |  |  | $ 5,100 | $ 15,500
ASU 2014-09 |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred revenue recognized |  |  | $ 9,492 | $ 7,716 | $ 14,571 | $ 10,229 | $ 12,337 | $ 13,998 |  |
Additional deferred revenue for outstanding performance obligations |  |  | $ 11,093 | $ 10,104 | $ 5,472 | $ 9,064 | $ 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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