Investments - Unrealized Gains and Losses and Fair Value (Details) - USD ($) $ in Thousands	Oct. 23, 2021	Apr. 24, 2021
Summary of investments
Gross Unrealized  Gains	$ 4,400	$ 3,493
Gross Unrealized  Losses	(84)	(34)
Fair Value	54,541	55,404
Equity securities
Summary of investments
Gross Unrealized  Gains	3,096	2,798
Gross Unrealized  Losses	(1)	(5)
Fair Value	15,094	14,954
Fixed income
Summary of investments
Gross Unrealized  Gains	124	136
Gross Unrealized  Losses	(83)	(29)
Fair Value	35,057	35,631
Other
Summary of investments
Gross Unrealized  Gains	1,180	559
Gross Unrealized  Losses	0	0
Fair Value	$ 4,390	$ 4,819