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Revenue Recognition Contract with Customer, Asset and Liability (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jan. 26, 2019
Apr. 28, 2018
Revenue from Contract with Customer [Abstract]    
Contract assets $ 26,542 $ 30,968
Contract liabilities - current 48,745 39,379
Contract liabilities - noncurrent 9,814 7,475
Dollar Change    
Contract assets (4,426)  
Contract liabilities - current 9,366  
Contract liabilities - noncurrent $ 2,339  
Change in Contract with Customer, Asset and Liability, Percentage [Abstract]    
Contract assets percent change (14.30%)  
Contract liabilities, current, percent change 23.80%  
Contract liabilities, noncurrent, percent change 31.30%  
Provision for Loss on Contracts $ 1,465 $ 87
Revenue recognized related to contract liability $ 34,268