Investments - Unrealized Gains and Losses and Fair Value (Details) - USD ($) $ in Thousands	Jan. 23, 2021	Apr. 25, 2020
Summary of investments
Gross Unrealized  Gains	$ 3,457	$ 1,651
Gross Unrealized  Losses	(19)	(6,446)
Fair Value	53,051	48,022
Equity securities
Summary of investments
Gross Unrealized  Gains	2,671	1,011
Gross Unrealized  Losses	0	(6,390)
Fair Value	15,492	12,692
Fixed income
Summary of investments
Gross Unrealized  Gains	182	268
Gross Unrealized  Losses	(19)	(56)
Fair Value	32,932	30,213
Other
Summary of investments
Gross Unrealized  Gains	604	372
Gross Unrealized  Losses	0	0
Fair Value	$ 4,627	$ 5,117