Nature of Business and Summary of Significant Accounting Policies Property and Equipment (Details)	12 Months Ended
	May 02, 2020
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	40 years
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years
Office furniture and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Office furniture and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Computer software and hardware | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Computer software and hardware | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Equipment held for rental | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	2 years
Equipment held for rental | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years
Demonstration equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Demonstration equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Transportation equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Transportation equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years