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Note E - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 28, 2019	Sep. 29, 2018
Property, plant and equipment, at cost	$ 676,724	$ 570,295
Less accumulated depreciation and amortization	423,276	327,622
Property, plant and equipment, net	253,448	242,673
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	$ 315,360	290,396
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	$ 240,681	163,733
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	$ 9,725	8,929
Property, plant and equipment, estimated useful life (Year)	5 years
Office Equipment [Member]
Property, plant and equipment, at cost	$ 31,217	30,752
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	$ 40,626	38,941
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	$ 10,039	$ 8,468

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
-Section 50
-Paragraph 1
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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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X

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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section S99
-Paragraph 1
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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=119400593&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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