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Organization and Significant Accounting Policies - Performance Obligations (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 31, 2020
Oct. 26, 2019
Oct. 31, 2020
Oct. 26, 2019
Organization and Significant Accounting Policies        
Remaining performance obligations satisfied over time (as a percentage) 40.00%   39.00%  
Remaining performance obligations at a point in time (as a percentage)   60.00%   61.00%
Remaining performance obligations $ 130,588   $ 130,588  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-30        
Organization and Significant Accounting Policies        
Remaining performance obligations (as a percentage) 92.00%   92.00%  
Performance Obligations        
Year of performance obligations 1 year   1 year  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-30        
Organization and Significant Accounting Policies        
Remaining performance obligations (as a percentage) 8.00%   8.00%  
Performance Obligations        
Year of performance obligations 1 year   1 year