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Fair Value Measurements - Hierarchy and Transfers (Details) - USD ($) $ in Thousands | Jul. 25, 2020 | Apr. 25, 2020
--- | --- | ---
Assets |  |
Total assets | $ 37,858 | $ 48,022
Recurring basis |  |
Assets |  |
Marketable securities | 27,803 | 38,206
Held-to-maturity investments | 2,476 | 3,337
Cost basis investments | 7,579 | 6,479
Total assets | 37,858 | 48,022
Recurring basis | Level 1 |  |
Assets |  |
Marketable securities | 0 | 0
Held-to-maturity investments | 2,476 | 3,337
Cost basis investments | 0 | 0
Total assets | 2,476 | 3,337
Recurring basis | Level 2 |  |
Assets |  |
Marketable securities | 20,608 | 31,691
Held-to-maturity investments | 0 | 0
Cost basis investments | 0 | 0
Total assets | 20,608 | 31,691
Recurring basis | Level 3 |  |
Assets |  |
Marketable securities | 0 | 0
Held-to-maturity investments | 0 | 0
Cost basis investments | 7,579 | 6,479
Total assets | 7,579 | 6,479
Recurring basis | NAV |  |
Assets |  |
Marketable securities | 7,195 | 6,515
Held-to-maturity investments | 0 | 0
Cost basis investments | 0 | 0
Total assets | $ 7,195 | $ 6,515

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