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Fair Value Measurements - Hierarchy and Transfers (Details)
$ in Thousands
 3 Months Ended
Jul. 29, 2017
USD ($)
company
Jul. 30, 2016
USD ($)
company
Apr. 29, 2017
USD ($)
Assets      
Total assets $ 58,323   $ 53,677
Cost basis investments      
Liabilities      
Preferred share investments, number of privately-held companies | company   2  
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      
Total assets 3,114 3,083  
Level 1 | Recurring basis | Available-for-sale investments      
Assets      
Total assets 1,180 1,217  
Level 1 | Recurring basis | Held-to-maturity investments      
Assets      
Total assets 1,934 1,866  
Level 2 | Recurring basis      
Assets      
Total assets 36,815 36,644  
Level 2 | Recurring basis | Available-for-sale investments      
Assets      
Total assets 36,794 36,638  
Level 2 | Recurring basis | Trading securities      
Assets      
Total assets $ 21 6  
Level 3      
Liabilities      
Preferred share investments, number of privately-held companies | company 2    
Preferred share investments with common share warrant, number of privately-held companies | company 1    
Available-for-sale securities converted to cost basis investment $ 3,000    
Level 3 | Recurring basis      
Assets      
Total assets 10,954 6,900  
Liabilities      
Contingent consideration liability 1,284 1,248  
Level 3 | Recurring basis | Available-for-sale investments      
Assets      
Total assets   1,400  
Level 3 | Recurring basis | Cost basis investments      
Assets      
Total assets $ 10,954 $ 5,500