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Environmnetal Matters - Narrative (Details) $ in Thousands	12 Months Ended
	May. 02, 2015 USD ($) site	May. 03, 2014 USD ($)	Apr. 27, 2013 USD ($)
Site Contingency [Line Items]
Number of plant sites subject to environmental investigation and/or remediation | site	2
Accruals for environmental matters	$ 2,800	$ 2,700
Spent on remediation clean-ups and related studies	500	400	$ 400
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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