Technology Partner Innovations, LLC (Details) - USD ($) $ in Thousands	3 Months Ended
Jul. 28, 2018	Jul. 29, 2017	Apr. 28, 2018
Business Acquisition [Line Items]
Net loss attributable to noncontrolling interest	$ (53)	$ 0
Noncontrolling interest	3,947		$ 0
Technology Partner Innovations, LLC
Business Acquisition [Line Items]
Net assets contributed	4,000
Net loss attributable to noncontrolling interest	53
Noncontrolling interest	$ 3,947

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