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Investments - Unrealized Gains and Losses and Fair Value (Details) - USD ($) $ in Thousands | Apr. 30, 2016 | Apr. 25, 2015
--- | --- | ---
Summary of investments |  |
Gross Unrealized Gains | $ 1,408 | $ 2,239
Gross Unrealized Losses | (165) | (114)
Fair Value | 46,976 | 61,195
Equity securities |  |
Summary of investments |  |
Gross Unrealized Gains | 1,231 | 2,014
Gross Unrealized Losses | (135) | (78)
Fair Value | 8,150 | 9,251
Fixed income |  |
Summary of investments |  |
Gross Unrealized Gains | 176 | 224
Gross Unrealized Losses | (9) | (14)
Fair Value | 36,527 | 50,358
Mutual funds |  |
Summary of investments |  |
Fair Value |  | 1,127
Other |  |
Summary of investments |  |
Gross Unrealized Gains | 1 | 1
Gross Unrealized Losses | (21) | (22)
Fair Value | $ 2,299 | $ 459

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