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Quarterly Financial Data (Unaudited) - (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Apr. 28, 2018 | Jan. 27, 2018 | Oct. 28, 2017 | Jul. 29, 2017 | Apr. 29, 2017 | Jan. 28, 2017 | Oct. 29, 2016 | Jul. 30, 2016 | Apr. 28, 2018 | Apr. 29, 2017 | Apr. 30, 2016
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 138,177 | $ 130,316 | $ 169,309 | $ 172,728 | $ 143,682 | $ 115,719 | $ 169,992 | $ 157,146 | $ 610,530 | $ 586,539 | $ 570,168
Gross profit | 29,852 | 28,567 | 42,604 | 44,646 | 33,724 | 23,316 | 44,308 | 39,067 | 145,669 | 140,415 | 121,019
Net income (loss) | $ (3,810) | $ (6,189) | $ 7,132 | $ 8,429 | $ 909 | $ (5,127) | $ 9,021 | $ 5,539 | $ 5,562 | $ 10,342 | $ 2,061
Basic earnings (loss) per share (in dollars per share) | $ (0.09) | $ (0.14) | $ 0.16 | $ 0.19 | $ 0.02 | $ (0.12) | $ 0.21 | $ 0.13 | $ 0.13 | $ 0.23 | $ 0.05
Diluted earnings (loss) per share (in dollars per share) | $ (0.09) | $ (0.14) | $ 0.16 | $ 0.19 | $ 0.02 | $ (0.12) | $ 0.20 | $ 0.13 | $ 0.12 | $ 0.23 | $ 0.05
Changes in accrued warranty costs for pre-existing warranties during the period, including expirations | $ 2,354 |  | $ 3,179 |  |  |  |  |  | $ 7,746 | $ 3,263 | $ 11,864
Impact of Tax Act | $ (461) | $ 4,280 |  |  |  |  |  |  | $ 3,819 | $ 0 | $ 0

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