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Earnings Per Share EPS - Reconciliation of Income (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 26, 2013	Jan. 28, 2012	Jan. 26, 2013	Jan. 28, 2012
Net income
Basic earnings per share	$ 2,710	$ 1,666	$ 20,935	$ 8,994
Dilution associated with stock compensation plans	0	0	0	0
Diluted earnings per share	$ 2,710	$ 1,666	$ 20,935	$ 8,994
Shares
Basic earnings per share (in shares)	42,343	41,916	42,206	41,811
Dilution associated with stock compensation plans (in shares)	196	160	241	364
Diluted earnings per share (in shares)	42,539	42,076	42,447	42,175
Per share income
Basic earnings per share (in dollars per share)	$ 0.06	$ 0.04	$ 0.50	$ 0.22
Dilution associated with stock compensation plans (in dollars per share)	$ 0.00	$ 0.00	$ (0.01)	$ (0.01)
Diluted earnings per share (in dollars per share)	$ 0.06	$ 0.04	$ 0.49	$ 0.21

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