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Technology Partner Innovations, LLC (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 27, 2018
Oct. 28, 2017
Oct. 27, 2018
Oct. 28, 2017
Apr. 28, 2018
Business Acquisition [Line Items]          
Net loss attributable to noncontrolling interest $ 223 $ 0 $ 276 $ 0  
Noncontrolling interest 3,724   3,724   $ 0
Technology Partner Innovations, LLC          
Business Acquisition [Line Items]          
Net assets contributed 4,000        
Net loss attributable to noncontrolling interest 223        
Noncontrolling interest $ 3,724   $ 3,724