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Revenue Recognition and Contracts with Customers - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Jul. 31, 2018 | May 01, 2018 | Apr. 30, 2018
Disaggregation Of Revenue [Line Items] |  |  |
Accrued sales promotions |  |  | $ 17,200
Deferred revenue relating to outstanding performance obligations | $ 13,621 |  | 23,305
Deferred tax asset |  |  | (12,895)
Reduction to beginning retained earnings | (392,181) |  | $ (389,146)
Revenue recognized | 13,998 |  |
Revenue deferred | 4,314 |  |
Net increase of revenue | $ 9,700 |  |
ASU 2014-09 |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Deferred revenue relating to outstanding performance obligations |  | $ 23,305 |
Deferred tax asset |  | (11,376) |
Reduction to beginning retained earnings |  | (384,536) |
ASU 2014-09 | Accounting Standard Adjustments |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Deferred revenue relating to outstanding performance obligations |  | 23,305 |
Deferred tax asset |  | 1,519 |
Reduction to beginning retained earnings |  | $ 4,610 |
Percentage of decrease in gross margin | 0.90% |  |
Increase in earnings per share basic | $ 0.03 |  |
Increase in earnings per share diluted | $ 0.03 |  |
Total Net Sales | ASU 2014-09 | Domestic |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Concentration risk percentage | 95.00% |  |

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