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Investments - Unrealized Gains and Losses and Fair Value (Details) - USD ($) $ in Thousands | Jul. 28, 2018 | Apr. 28, 2018
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Summary of investments |  |
Gross Unrealized Gains | $ 2,660 | $ 2,243
Gross Unrealized Losses | (423) | (457)
Fair Value | 56,762 | 59,354
Equity securities |  |
Summary of investments |  |
Gross Unrealized Gains | 2,462 | 2,142
Gross Unrealized Losses | (44) | (39)
Fair Value | 19,038 | 18,765
Fixed income |  |
Summary of investments |  |
Gross Unrealized Gains | 29 | 29
Gross Unrealized Losses | (366) | (418)
Fair Value | 33,587 | 36,312
Other |  |
Summary of investments |  |
Gross Unrealized Gains | 169 | 72
Gross Unrealized Losses | (13) |
Fair Value | $ 4,137 | $ 4,277

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