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Note E - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 26, 2020	Sep. 28, 2019
Property, plant and equipment, at cost	$ 717,261	$ 676,724
Less accumulated depreciation and amortization	455,645	423,276
Property, plant and equipment, net	261,616	253,448
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	$ 330,168	315,360
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	$ 250,914	240,681
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	$ 9,966	9,725
Property, plant and equipment, estimated useful life (Year)	5 years
Office Equipment [Member]
Property, plant and equipment, at cost	$ 33,878	31,217
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	$ 43,264	40,626
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	$ 19,995	$ 10,039

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
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X

- Definition

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.

+ References

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X

- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(8))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

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- Definition

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.

+ References

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