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SEGMENT INFORMATION (Capital expenditures, depreciation and amortization expense by segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 03, 2021	Mar. 28, 2020	Apr. 03, 2021	Mar. 28, 2020
Segment Reporting, Other Significant Reconciling Item [Line Items]
Property, Plant and Equipment, Additions	$ 5,121	$ 2,775	$ 8,808	$ 5,099
Depreciation and amortization expense:
Depreciation expense	3,245	2,949	6,434	5,891
Amortization expense	1,355	1,820	3,313	3,637
Capital Equipment [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Property, Plant and Equipment, Additions	3,456	812	5,595	1,886
Depreciation and amortization expense:
Depreciation expense	1,619	1,491	3,182	3,034
Amortization expense	855	977	1,906	1,952
Aftermarket Products and Services (APS) [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Property, Plant and Equipment, Additions	1,665	1,963	3,213	3,213
Depreciation and amortization expense:
Depreciation expense	1,626	1,458	3,252	2,857
Amortization expense	$ 500	$ 843	$ 1,407	$ 1,685

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 2: 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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-Name Accounting Standards Codification
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X

- 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
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- References

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X

- Definition

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.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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