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Fair Value Measurements - Hierarchy and Transfers (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 28, 2017 | Apr. 30, 2016
Assets |  |
Total investments | $ 49,645 | $ 46,976
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 investments | 3,093 | 3,003
Level 1 | Recurring basis | Available-for-sale investments |  |
Assets |  |
Total investments | 1,263 | 1,177
Level 1 | Recurring basis | Held-to-maturity investments |  |
Assets |  |
Total investments | 1,830 | 1,826
Level 2 | Recurring basis |  |
Assets |  |
Total investments | 33,647 | 36,802
Level 2 | Recurring basis | Available-for-sale investments |  |
Assets |  |
Total investments | 33,637 | $ 36,802
Level 2 | Recurring basis | Trading securities |  |
Assets |  |
Total investments | 10 |
Level 3 | Recurring basis |  |
Assets |  |
Total investments | 6,250 |
Liabilities |  |
Contingent consideration liability | 1,224 |
Level 3 | Recurring basis | Available-for-sale investments |  |
Assets |  |
Total investments | 750 |
Level 3 | Recurring basis | Cost basis investment |  |
Assets |  |
Total investments | $ 5,500 |

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