Income Taxes, Valuation Allowance (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 25, 2015
Summary of valuation allowance by jurisdiction
Valuation Allowance, beginning of period	$ 4,700
Change	(378)
Valuation Allowance, end of period	4,322
U.S state
Summary of valuation allowance by jurisdiction
Valuation Allowance, beginning of period	4,680
Change	(377)
Valuation Allowance, end of period	4,303
Foreign
Summary of valuation allowance by jurisdiction
Valuation Allowance, beginning of period	20
Change	(1)
Valuation Allowance, end of period	$ 19