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Note E - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($)
Sep. 28, 2024
Sep. 30, 2023
Property, plant and equipment, at cost $ 1,012,043,000 $ 960,198,000
Less accumulated depreciation and amortization 620,858,000 574,295,000
Property, plant and equipment, net 391,185,000 385,903,000
Land [Member]    
Property, plant and equipment, at cost 3,684,000 3,684,000
Building [Member]    
Property, plant and equipment, at cost $ 122,919,000 96,857,000
Building [Member] | Minimum [Member]    
Property, plant and equipment, estimated useful life (Year) 5 years  
Building [Member] | Maximum [Member]    
Property, plant and equipment, at cost $ 39,500  
Machinery and Equipment [Member]    
Property, plant and equipment, at cost $ 475,194,000 445,299,000
Machinery and Equipment [Member] | Minimum [Member]    
Property, plant and equipment, estimated useful life (Year) 5 years  
Machinery and Equipment [Member] | Maximum [Member]    
Property, plant and equipment, estimated useful life (Year) 20 years  
Equipment [Member]    
Property, plant and equipment, at cost $ 317,269,000 296,482,000
Equipment [Member] | Minimum [Member]    
Property, plant and equipment, estimated useful life (Year) 5 years  
Equipment [Member] | Maximum [Member]    
Property, plant and equipment, estimated useful life (Year) 7 years  
Transportation Equipment [Member]    
Property, plant and equipment, at cost $ 15,796,000 14,367,000
Property, plant and equipment, estimated useful life (Year) 5 years  
Office Equipment [Member]    
Property, plant and equipment, at cost $ 48,589,000 47,393,000
Office Equipment [Member] | Minimum [Member]    
Property, plant and equipment, estimated useful life (Year) 3 years  
Office Equipment [Member] | Maximum [Member]    
Property, plant and equipment, estimated useful life (Year) 5 years  
Construction in Progress [Member]    
Property, plant and equipment, at cost $ 28,592,000 $ 56,116,000