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Investments - Unrealized Gains and Losses and Fair Value (Details) - USD ($) $ in Thousands | Apr. 29, 2017 | Apr. 30, 2016
--- | --- | ---
Summary of investments |  |
Gross Unrealized Gains | $ 2,526 | $ 1,408
Gross Unrealized Losses | (163) | (165)
Fair Value | 53,677 | 46,976
Equity securities |  |
Summary of investments |  |
Gross Unrealized Gains | 1,796 | 1,231
Gross Unrealized Losses | (83) | (135)
Fair Value | 13,610 | 8,150
Fixed income |  |
Summary of investments |  |
Gross Unrealized Gains | 729 | 176
Gross Unrealized Losses | (72) | (9)
Fair Value | 37,580 | 36,527
Mutual funds |  |
Summary of investments |  |
Fair Value | 6 |
Other |  |
Summary of investments |  |
Gross Unrealized Gains | 1 | 1
Gross Unrealized Losses | (8) | (21)
Fair Value | $ 2,481 | $ 2,299

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