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SEGMENT INFORMATION (Capital expenditures, depreciation, and amortization expense by segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Capital expenditures:
Capital expenditures	$ 11,829	$ 20,441	$ 25,688
Depreciation expense:
Depreciation expense	12,892	11,189	9,703
Amortization expense:
Amortization expense	7,412	7,826	6,554
Capital Equipment
Capital expenditures:
Capital expenditures	5,380	7,029	14,415
Depreciation expense:
Depreciation expense	7,584	7,435	6,306
Amortization expense:
Amortization expense	3,977	4,203	2,841
APS [Member]
Capital expenditures:
Capital expenditures	6,449	13,412	11,273
Depreciation expense:
Depreciation expense	5,308	3,754	3,397
Amortization expense:
Amortization expense	$ 3,435	$ 3,623	$ 3,713

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- Definition

-- None. No documentation exists for this element. --

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- Definition

The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
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Amount of acquisition of long-lived, 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, furniture and fixtures, and computer equipment.

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