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Fair Value Measurements - Hierarchy and Transfers (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 29, 2017 | Apr. 30, 2016
Assets |  |
Total assets | $ 53,677 | $ 46,976
Recurring basis |  |
Liabilities |  |
Transfers from Level 1 to Level 2 assets | 0 | 0
Transfers from Level 2 to Level 1 assets | 0 | 0
Transfers into Level 3 assets | 0 | 0
Transfers out of Level 3 assets | 0 | 0
Transfers into Level 3 liabilities | 0 | 0
Transfers out of Level 3 liabilities | 0 | 0
Level 1 | Recurring basis |  |
Assets |  |
Total assets | 3,083 | 3,003
Level 1 | Recurring basis | Available-for-sale investments |  |
Assets |  |
Total assets | 1,217 | 1,177
Level 1 | Recurring basis | Held-to-maturity investments |  |
Assets |  |
Total assets | 1,866 | 1,826
Level 2 | Recurring basis |  |
Assets |  |
Total assets | 36,644 | 36,802
Level 2 | Recurring basis | Available-for-sale investments |  |
Assets |  |
Total assets | 36,638 | $ 36,802
Level 2 | Recurring basis | Trading securities |  |
Assets |  |
Total assets | 6 |
Level 3 | Recurring basis |  |
Assets |  |
Total assets | 6,900 |
Liabilities |  |
Contingent consideration liability | 1,248 |
Level 3 | Recurring basis | Available-for-sale investments |  |
Assets |  |
Total assets | 1,400 |
Level 3 | Recurring basis | Cost basis investment |  |
Assets |  |
Total assets | $ 5,500 |

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