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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		6 Months Ended
	Oct. 27, 2012	Oct. 29, 2011	Oct. 27, 2012	Oct. 29, 2011
Net income
Basic earnings per share	$ 11,547	$ 3,959	$ 18,225	$ 7,327
Dilution associated with stock compensation plans	0	0	0	0
Diluted earnings per share	$ 11,547	$ 3,959	$ 18,225	$ 7,327
Shares
Basic earnings per share (in shares)	42,163	41,792	42,138	41,759
Dilution associated with stock compensation plans (in shares)	153	142	149	179
Diluted earnings per share (in shares)	42,316	41,934	42,287	41,938
Per Share income
Basic earnings per share (in dollars per share)	$ 0.27	$ 0.09	$ 0.43	$ 0.18
Dilution associated with stock compensation plans (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ (0.01)
Diluted earnings per share (in dollars per share)	$ 0.27	$ 0.09	$ 0.43	$ 0.17

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