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Fair Value Measurements - Hierarchy and Transfers (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 29, 2017 USD ($) | Jan. 27, 2018 USD ($) company | Apr. 29, 2017 USD ($)
Assets |  |  |
Total assets |  | $ 61,044 | $ 53,677
Cost basis investments |  |  |
Liabilities |  |  |
Preferred share investments, number of privately-held companies | company |  | 2 |
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 |  | 4,581 | 3,083
Level 1 | Recurring basis | Available-for-sale investments |  |  |
Assets |  |  |
Total assets |  | 1,223 | 1,217
Level 1 | Recurring basis | Held-to-maturity investments |  |  |
Assets |  |  |
Total assets |  | 3,358 | 1,866
Level 2 | Recurring basis |  |  |
Assets |  |  |
Total assets |  | 38,183 | 36,644
Level 2 | Recurring basis | Available-for-sale investments |  |  |
Assets |  |  |
Total assets |  | 38,171 | 36,638
Level 2 | Recurring basis | Trading securities |  |  |
Assets |  |  |
Total assets |  | $ 12 | 6
Level 3 |  |  |
Liabilities |  |  |
Preferred share investments, number of privately-held companies | company |  | 2 |
Preferred share investments with common share warrant, number of privately-held companies | company |  | 1 |
Available-for-sale securities converted to cost basis investment | $ 3,000 |  |
Level 3 | Recurring basis |  |  |
Assets |  |  |
Total assets |  | $ 10,954 | 6,900
Liabilities |  |  |
Contingent consideration liability |  | 354 | 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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