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Fair Value Measurements - Hierarchy and Transfers (Details) - USD ($) $ in Thousands | Apr. 24, 2021 | Apr. 25, 2020
--- | --- | ---
Assets |  |
Total assets | $ 55,404 | $ 48,022
Recurring basis |  |
Assets |  |
Marketable securities | 45,293 | 38,206
Held-to-maturity investments | 2,532 | 3,337
Cost basis investments | 7,579 | 6,479
Total assets | 55,404 | 48,022
Liabilities |  |
Contingent consideration liability | 14,100 | 0
Recurring basis | Level 1 |  |
Assets |  |
Marketable securities | 119 | 0
Held-to-maturity investments | 2,532 | 3,337
Cost basis investments | 0 | 0
Total assets | 2,651 | 3,337
Liabilities |  |
Contingent consideration liability | 0 | 0
Recurring basis | Level 2 |  |
Assets |  |
Marketable securities | 37,572 | 31,691
Held-to-maturity investments | 0 | 0
Cost basis investments | 0 | 0
Total assets | 37,572 | 31,691
Liabilities |  |
Contingent consideration liability | 0 | 0
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
Liabilities |  |
Contingent consideration liability | 14,100 | 0
Recurring basis | NAV |  |
Assets |  |
Marketable securities | 7,602 | 6,515
Held-to-maturity investments | 0 | 0
Cost basis investments | 0 | 0
Total assets | 7,602 | 6,515
Liabilities |  |
Contingent consideration liability | $ 0 | $ 0

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