Income Taxes - Valuation Allowance (Details) $ in Thousands	12 Months Ended
	Apr. 29, 2017 USD ($)
Summary of valuation allowance by jurisdiction
Valuation Allowance, beginning of period	$ 3,625
Change	(1,839)
Valuation Allowance, end of period	1,786
U.S. state
Summary of valuation allowance by jurisdiction
Valuation Allowance, beginning of period	3,606
Change	(1,837)
Valuation Allowance, end of period	1,769
Foreign
Summary of valuation allowance by jurisdiction
Valuation Allowance, beginning of period	19
Change	(2)
Valuation Allowance, end of period	$ 17