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Revenue Recognition - Additional Information (Detail) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2018 | Apr. 30, 2019 | May 01, 2018
Revenue Recognition [Line Items] |  |  |
Contract assets | $ 1,007,000 | $ 4,589,000 |
Contract liabilities | $ 1,884,000 | $ 1,599,000 |
ASU 2014-09 |  |  |
Revenue Recognition [Line Items] |  |  |
Cumulative effect adjustment to increase retained earnings |  |  | $ 217,000
Fiscal Year 2019 |  |  |
Revenue Recognition [Line Items] |  |  |
Contract liability recognized as revenue percentage | 100.00% |  |

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