Selected Financial Statement Data - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	May 02, 2026	Apr. 26, 2025
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 285,783	$ 285,019
Less accumulated depreciation	221,520	211,135
Property, plant and equipment, net	64,263	73,884
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,166	3,024
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	74,036	73,373
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	142,107	139,079
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,270	4,027
Computer software and hardware
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	42,855	48,087
Construction in Process
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,801	1,619
Demonstration equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,717	7,355
Transportation equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 8,831	$ 8,455

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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