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Nature of Business and Summary of Significant Accounting Policies - Earnings (Loss) Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Apr. 27, 2013	Jan. 26, 2013	Oct. 27, 2012	Jul. 28, 2012	Apr. 28, 2012	Jan. 28, 2012	Oct. 29, 2011	Jul. 30, 2011	Apr. 27, 2013	Apr. 28, 2012	Apr. 30, 2011
Net income
Basic earnings per share	$ 1,844	$ 2,710	$ 11,547	$ 6,678	$ (505)	$ 1,666	$ 3,959	$ 3,368	$ 22,779	$ 8,489	$ 14,244
Dilution associated with stock compensation plans									0	0	0
Diluted earnings per share									$ 22,779	$ 8,489	$ 14,244
Shares
Basic earnings per share (in shares)									42,280	41,869	41,422
Dilution associated with stock compensation plans (in shares)									341	435	855
Diluted earnings per share (in shares)									42,621	42,304	42,277
Per share income (loss)
Basic earnings per share (in dollars per share)	$ 0.04	$ 0.06	$ 0.27	$ 0.16	$ (0.01)	$ 0.04	$ 0.09	$ 0.08	$ 0.54	$ 0.20	$ 0.34
Dilution associated with stock compensation plans (in dollars per share)									$ (0.01)	$ 0.00	$ 0.00
Diluted earnings per share (in dollars per share)	$ 0.04	$ 0.06	$ 0.27	$ 0.16	$ (0.01)	$ 0.04	$ 0.09	$ 0.08	$ 0.53	$ 0.20	$ 0.34
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities excluded from computation of earnings per share (in shares)									2,672	1,611	1,655
Antidilutive securities excluded from computation of earnings per share, weighted average exercise price (in dollars per share)									$ 15.09	$ 19.17	$ 19.23

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