Income Taxes - Valuation Allowance (Details) $ in Thousands	12 Months Ended
	Apr. 27, 2019 USD ($)
Summary of valuation allowance by jurisdiction
Valuation Allowance, beginning of the period	$ 1,224
Change	1,088
Valuation Allowance, end of the period	2,312
U.S. Federal
Summary of valuation allowance by jurisdiction
Change	586
Valuation Allowance, end of the period	586
U.S. state
Summary of valuation allowance by jurisdiction
Valuation Allowance, beginning of the period	1,207
Change	502
Valuation Allowance, end of the period	1,709
Foreign
Summary of valuation allowance by jurisdiction
Valuation Allowance, beginning of the period	17
Valuation Allowance, end of the period	$ 17