Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2022	Apr. 24, 2021	Apr. 25, 2020
Property, Plant and Equipment
Gross property, plant and equipment	$ 648,846	$ 595,047
Accumulated depreciation	(395,702)	(375,853)
Net property, plant and equipment	253,144	219,194
Depreciation expense	$ 38,300	31,700	$ 30,000
Minimum
Property, Plant and Equipment
Estimated Useful Lives	3 years
Maximum
Property, Plant and Equipment
Estimated Useful Lives	5 years
Buildings and building fixtures
Property, Plant and Equipment
Gross property, plant and equipment	$ 250,758	234,375
Buildings and building fixtures | Minimum
Property, Plant and Equipment
Estimated Useful Lives	3 years
Buildings and building fixtures | Maximum
Property, Plant and Equipment
Estimated Useful Lives	30 years
Machinery and equipment
Property, Plant and Equipment
Gross property, plant and equipment	$ 184,223	167,577
Machinery and equipment | Minimum
Property, Plant and Equipment
Estimated Useful Lives	3 years
Machinery and equipment | Maximum
Property, Plant and Equipment
Estimated Useful Lives	20 years
Information systems, hardware and software
Property, Plant and Equipment
Gross property, plant and equipment	$ 102,861	93,174
Information systems, hardware and software | Minimum
Property, Plant and Equipment
Estimated Useful Lives	3 years
Information systems, hardware and software | Maximum
Property, Plant and Equipment
Estimated Useful Lives	15 years
Furniture and fixtures
Property, Plant and Equipment
Gross property, plant and equipment	$ 23,665	23,441
Furniture and fixtures | Minimum
Property, Plant and Equipment
Estimated Useful Lives	3 years
Furniture and fixtures | Maximum
Property, Plant and Equipment
Estimated Useful Lives	10 years
Land improvements
Property, Plant and Equipment
Gross property, plant and equipment	$ 23,541	23,855
Land improvements | Minimum
Property, Plant and Equipment
Estimated Useful Lives	3 years
Land improvements | Maximum
Property, Plant and Equipment
Estimated Useful Lives	30 years
Transportation equipment
Property, Plant and Equipment
Gross property, plant and equipment	$ 16,499	15,372
Transportation equipment | Minimum
Property, Plant and Equipment
Estimated Useful Lives	3 years
Transportation equipment | Maximum
Property, Plant and Equipment
Estimated Useful Lives	6 years
Land
Property, Plant and Equipment
Gross property, plant and equipment	$ 8,587	12,405
Construction in progress
Property, Plant and Equipment
Gross property, plant and equipment	$ 38,712	$ 24,848