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Fair Value Measurements - Hierarchy and Transfers (Details) - USD ($)
$ in Thousands
Oct. 23, 2021
Apr. 24, 2021
Assets    
Total assets $ 54,541 $ 55,404
Recurring basis    
Assets    
Marketable securities 45,591 45,293
Held-to-maturity investments 1,371 2,532
Cost basis investments 7,579 7,579
Total assets 54,541 55,404
Liabilities    
Contingent consideration liability 4,600 14,100
Recurring basis | Level 1    
Assets    
Marketable securities 0 119
Held-to-maturity investments 1,371 2,532
Cost basis investments 0 0
Total assets 1,371 2,651
Liabilities    
Contingent consideration liability 0 0
Recurring basis | Level 2    
Assets    
Marketable securities 37,580 37,572
Held-to-maturity investments 0 0
Cost basis investments 0 0
Total assets 37,580 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 4,600 14,100
Recurring basis | NAV    
Assets    
Marketable securities 8,011 7,602
Held-to-maturity investments 0 0
Cost basis investments 0 0
Total assets 8,011 7,602
Liabilities    
Contingent consideration liability $ 0 $ 0