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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