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Nature of Business and Summary of Significant Accounting Policies Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ 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
Net income
Basic earnings per share	$ (3,810)	$ (6,189)	$ 7,132	$ 8,429	$ 909	$ (5,127)	$ 9,021	$ 5,539	$ 5,562	$ 10,342	$ 2,061
Dilution associated with stock compensation plans									0	0	0
Diluted earnings per share									$ 5,562	$ 10,342	$ 2,061
Shares
Basic earnings per share (in shares)									44,457	44,114	43,990
Dilution associated with stock compensation plans (in shares)									416	189	466
Diluted earnings per share (in shares)									44,873	44,303	44,456
Per share income (loss)
Basic earnings 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
Dilution associated with stock compensation plans (in dollars per share)									(0.01)	0.00	0.00
Diluted earnings 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
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities excluded from computation of earnings per share (in shares)									1,548	2,112	2,122
Antidilutive securities excluded from computation of earnings per share, weighted average exercise price (in dollars per share)									$ 11.69	$ 13.30	$ 15.04

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