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Quarterly Financial Data (Unaudited) - (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								9 Months Ended	12 Months Ended
	Apr. 27, 2019	Jan. 26, 2019	Oct. 27, 2018	Jul. 28, 2018	Apr. 28, 2018	Jan. 27, 2018	Oct. 28, 2017	Jul. 29, 2017	Jan. 26, 2019	Apr. 27, 2019	Apr. 28, 2018	Apr. 29, 2017
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 127,755	$ 115,069	$ 172,692	$ 154,188	$ 138,177	$ 130,316	$ 169,309	$ 172,728		$ 569,704	$ 610,530	$ 586,539
Gross profit	24,421	24,869	42,757	38,247	29,852	28,567	42,604	44,646		130,294	145,669	140,415
Net income (loss)	$ (10,819)	$ (3,319)	$ 8,606	$ 4,574	$ (3,810)	$ (6,189)	$ 7,132	$ 8,429		$ (958)	$ 5,562	$ 10,342
Basic earnings (loss) per share (in dollars per share)	$ (0.24)	$ (0.07)	$ 0.19	$ 0.10	$ (0.09)	$ (0.14)	$ 0.16	$ 0.19		$ (0.02)	$ 0.13	$ 0.23
Diluted earnings (loss) per share (in dollars per share)	$ (0.24)	$ (0.07)	$ 0.19	$ 0.10	$ (0.09)	$ (0.14)	$ 0.16	$ 0.19		$ (0.02)	$ 0.12	$ 0.23
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations									$ 2,775	$ 2,741	$ 139
Deferred Other Tax Expense (Benefit)									$ 480	471
Changes in accrued warranty obligations for pre-existing warranties during the period, including expirations					$ 2,354		$ 3,179			1,993	7,746	$ 3,263
Impact of Tax Act					$ (461)	$ 4,280				$ 0	$ 3,819	$ 0

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