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Fair Value Measurements - Hierarchy and Transfers (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 28, 2018 | Apr. 29, 2017
Assets |  |
Total assets | $ 59,354 | $ 53,677
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 | 4,481 | 3,083
Level 1 | Recurring basis | Available-for-sale investments |  |
Assets |  |
Total assets | 1,141 | 1,217
Level 1 | Recurring basis | Held-to-maturity investments |  |
Assets |  |
Total assets | 3,340 | 1,866
Level 2 | Recurring basis |  |
Assets |  |
Total assets | 37,173 | 36,644
Level 2 | Recurring basis | Available-for-sale investments |  |
Assets |  |
Total assets | 37,079 | 36,638
Level 2 | Recurring basis | Trading securities |  |
Assets |  |
Total assets | 94 | 6
Level 3 | Recurring basis |  |
Assets |  |
Total assets | 10,954 | 6,900
Liabilities |  |
Contingent consideration liability | 344 | 1,248
Level 3 | Recurring basis | Available-for-sale investments |  |
Assets |  |
Total assets |  | 1,400
Level 3 | Recurring basis | Cost basis investments |  |
Assets |  |
Total assets | $ 10,954 | $ 5,500

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