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Note E - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 25, 2021	Sep. 26, 2020
Property, plant and equipment, at cost	$ 757,242	$ 717,261
Less accumulated depreciation and amortization	490,055	455,645
Property, plant and equipment, net	267,187	261,616
Land [Member]
Property, plant and equipment, at cost	2,494	2,494
Building [Member]
Property, plant and equipment, at cost	$ 26,582	26,582
Building [Member] | Minimum [Member]
Property, plant and equipment, estimated useful life (Year)	15 years
Building [Member] | Maximum [Member]
Property, plant and equipment, estimated useful life (Year)	39 years 6 months
Machinery and Equipment [Member]
Property, plant and equipment, at cost	$ 343,716	330,168
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	$ 258,624	250,914
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	$ 10,315	9,966
Property, plant and equipment, estimated useful life (Year)	5 years
Office Equipment [Member]
Property, plant and equipment, at cost	$ 34,648	33,878
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
Improvements [Member]
Property, plant and equipment, at cost	$ 45,578	43,264
Improvements [Member] | Minimum [Member]
Property, plant and equipment, estimated useful life (Year)	5 years
Improvements [Member] | Maximum [Member]
Property, plant and equipment, estimated useful life (Year)	20 years
Construction in Progress [Member]
Property, plant and equipment, at cost	$ 35,285	$ 19,995

X

- Definition

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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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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