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Fair Value Measurements - Hierarchy and Transfers (Details) - USD ($) $ in Thousands | Jul. 24, 2021 | Apr. 24, 2021
--- | --- | ---
Assets |  |
Total assets | $ 55,650 | $ 55,404
Recurring basis |  |
Assets |  |
Marketable securities | 45,657 | 45,293
Held-to-maturity investments | 2,414 | 2,532
Cost basis investments | 7,579 | 7,579
Total assets | 55,650 | 55,404
Liabilities |  |
Contingent consideration liability | 14,100 | 14,100
Recurring basis | Level 1 |  |
Assets |  |
Marketable securities | 250 | 119
Held-to-maturity investments | 2,414 | 2,532
Cost basis investments | 0 | 0
Total assets | 2,664 | 2,651
Liabilities |  |
Contingent consideration liability | 0 | 0
Recurring basis | Level 2 |  |
Assets |  |
Marketable securities | 37,784 | 37,572
Held-to-maturity investments | 0 | 0
Cost basis investments | 0 | 0
Total assets | 37,784 | 37,572
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 | 7,579
Total assets | 7,579 | 7,579
Liabilities |  |
Contingent consideration liability | 14,100 | 14,100
Recurring basis | NAV |  |
Assets |  |
Marketable securities | 7,623 | 7,602
Held-to-maturity investments | 0 | 0
Cost basis investments | 0 | 0
Total assets | 7,623 | 7,602
Liabilities |  |
Contingent consideration liability | $ 0 | $ 0

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