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Environmnetal Matters (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 27, 2013 site	Apr. 28, 2012	Apr. 30, 2011
Site Contingency [Line Items]
Number of plant sites subject to environmental investigation and/or remediation	2
Accruals for environmental matters	$ 2,829	$ 2,881
Spent on remediation clean-ups and related studies	351	1,501	527
Other accrued expenses
Site Contingency [Line Items]
Accruals for environmental matters	$ 500	$ 500

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Site Contingency, Number of Sites Subject to Environmental Investigation or Remediation

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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