Investments - Summary of Unrealized Gains, Unrealized Losses and Fair Value (Details) - USD ($) $ in Thousands	Apr. 24, 2021	Apr. 25, 2020
Investments
Gross Unrealized  Gains	$ 3,493	$ 1,651
Gross Unrealized  Losses	(34)	(6,446)
Fair Value	55,404	48,022
Equity securities
Investments
Gross Unrealized  Gains	2,798	1,011
Gross Unrealized  Losses	(5)	(6,390)
Fair Value	14,954	12,692
Fixed income
Investments
Gross Unrealized  Gains	136	268
Gross Unrealized  Losses	(29)	(56)
Fair Value	35,631	30,213
Other
Investments
Gross Unrealized  Gains	559	372
Gross Unrealized  Losses	0	0
Fair Value	$ 4,819	$ 5,117