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Fair Value Measurements - Hierarchy and Transfers (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jul. 28, 2018
Apr. 28, 2018
Assets    
Total assets $ 56,762 $ 59,354
Recurring basis    
Liabilities    
Transfers from Level 1 to Level 2 assets 0 0
Transfers from Level 2 to Level 1 assets 0 0
Transfers into Level 3 assets 0 0
Transfers out of Level 3 assets 0 0
Transfers into Level 3 liabilities 0 0
Transfers out of Level 3 liabilities 0 0
Level 1 | Recurring basis    
Assets    
Marketable securities 1,180 1,141
Held-to-maturity investments 3,038 3,340
Total assets 4,218 4,481
Level 2 | Recurring basis    
Assets    
Marketable securities 34,544 37,173
Total assets 34,544 37,173
Level 3 | Recurring basis    
Assets    
Cost basis investments 10,954 10,954
Total assets 10,954 10,954
Liabilities    
Contingent consideration liability $ 328 $ 344