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Quarterly Financial Data (Unaudited) - (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	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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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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