Selected Financial Statement Data - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Apr. 26, 2025	Apr. 27, 2024
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 285,019	$ 276,273
Less accumulated depreciation	211,135	204,521
Property, plant and equipment, net	73,884	71,752
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,024	2,895
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	73,373	71,670
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	139,079	131,983
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,027	3,765
Computer software and hardware
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	48,087	46,135
Construction in Process
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,619	5,064
Demonstration equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,355	7,094
Transportation equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 8,455	$ 7,667

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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