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Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2020 | Jan. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 395,755 | $ 384,080 | $ 1,251,136 | $ 1,237,920
Home center retailers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 191,544 | 186,001 | 579,443 | 587,592
Builders |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 155,169 | 147,343 | 512,513 | 482,023
Independent dealers and distributors |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 49,042 | $ 50,736 | $ 159,180 | $ 168,305

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