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Revenue Recognition Remaining Performance Obligations (Details)
$ in Thousands
3 Months Ended
Jul. 28, 2018
USD ($)
Revenue from Contract with Customer [Abstract]  
Remaining performance obligation $ 223,751
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation, service agreements 46,932
Remaining performance obligation, products 176,819
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-07-29  
Revenue from Contract with Customer [Abstract]  
Remaining performance obligation $ 190,219
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation recognition period 12 months