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Fair Value Measurements - Level 3 Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 29, 2017
Apr. 29, 2017
Reconciliation of Level 3 assets recorded at fair value using significant unobservable inputs    
Balance at beginning of period $ 6,900  
Purchases 2,500  
Realized gain 2,204  
Unrealized gain reclassified to net income (650)  
Balance at end of period 10,954  
Reconciliation of Level 3 liabilities recorded at fair value using significant unobservable inputs    
Balance at beginning of period 1,248  
Translation adjustment 36  
Balance at end of period 1,284  
Available-for-sale investments    
Investments not included in the fair value hierarchy    
Fair value of investments measured using net asset value $ 7,400 $ 7,100