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Note E - Property, Plant and Equipment (Details) - Property, Plant and Equipment - USD ($)
$ in Thousands
12 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Property, Plant and Equipment [Line Items]    
Plant, Property and Equipment $ 573,710 $ 538,081
Land [Member]    
Property, Plant and Equipment [Line Items]    
Plant, Property and Equipment 2,496 2,496
Building [Member]    
Property, Plant and Equipment [Line Items]    
Plant, Property and Equipment 26,741 26,741
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Plant, Property and Equipment 210,728 195,566
Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Plant, Property and Equipment 268,082 256,389
Transportation Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Plant, Property and Equipment 6,866 6,913
Office Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Plant, Property and Equipment 20,586 18,556
Building Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Plant, Property and Equipment 28,725 26,635
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Plant, Property and Equipment $ 9,486 $ 4,785
Minimum [Member] | Building [Member]    
Property, Plant and Equipment [Line Items]    
Plant, Property and Equipment, Useful Life 15 years  
Minimum [Member] | Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Plant, Property and Equipment, Useful Life 5 years  
Minimum [Member] | Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Plant, Property and Equipment, Useful Life 5 years  
Minimum [Member] | Office Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Plant, Property and Equipment, Useful Life 3 years  
Minimum [Member] | Building Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Plant, Property and Equipment, Useful Life 5 years  
Maximum [Member] | Building [Member]    
Property, Plant and Equipment [Line Items]    
Plant, Property and Equipment, Useful Life 39 years 6 months  
Maximum [Member] | Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Plant, Property and Equipment, Useful Life 20 years  
Maximum [Member] | Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Plant, Property and Equipment, Useful Life 7 years  
Maximum [Member] | Transportation Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Plant, Property and Equipment, Useful Life 5 years  
Maximum [Member] | Office Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Plant, Property and Equipment, Useful Life 5 years  
Maximum [Member] | Building Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Plant, Property and Equipment, Useful Life 20 years