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Investments - Unrealized Gains and Losses and Fair Value (Details) - USD ($) $ in Thousands | Jan. 27, 2018 | Apr. 29, 2017
--- | --- | ---
Summary of investments |  |
Gross Unrealized Gains | $ 2,680 | $ 2,526
Gross Unrealized Losses | (334) | (163)
Fair Value | 61,044 | 53,677
Equity securities |  |
Summary of investments |  |
Gross Unrealized Gains | 2,565 | 1,796
Gross Unrealized Losses | (25) | (83)
Fair Value | 19,094 | 13,610
Fixed income |  |
Summary of investments |  |
Gross Unrealized Gains | 38 | 729
Gross Unrealized Losses | (309) | (72)
Fair Value | 37,479 | 37,580
Mutual funds |  |
Summary of investments |  |
Fair Value | 12 | 6
Other |  |
Summary of investments |  |
Gross Unrealized Gains | 77 | 1
Gross Unrealized Losses |  | (8)
Fair Value | $ 4,459 | $ 2,481

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