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Investments - Unrealized Gains and Losses and Fair Value (Details) - USD ($) $ in Thousands | Jan. 28, 2017 | Apr. 30, 2016
--- | --- | ---
Summary of investments |  |
Gross Unrealized Gains | $ 1,530 | $ 1,408
Gross Unrealized Losses | (224) | (165)
Fair Value | 49,645 | 46,976
Equity securities |  |
Summary of investments |  |
Gross Unrealized Gains | 1,467 | 1,231
Gross Unrealized Losses | (98) | (135)
Fair Value | 13,257 | 8,150
Fixed income |  |
Summary of investments |  |
Gross Unrealized Gains | 62 | 176
Gross Unrealized Losses | (118) | (9)
Fair Value | 33,972 | 36,527
Mutual funds |  |
Summary of investments |  |
Fair Value | 10 |
Other |  |
Summary of investments |  |
Gross Unrealized Gains | 1 | 1
Gross Unrealized Losses | (8) | (21)
Fair Value | $ 2,406 | $ 2,299

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