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Goodwill and Intangible Assets - Finite Lived Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 29, 2020	Sep. 29, 2019
Finite-lived intangible assets
Gross Amount	$ 99,469	$ 96,722
Accumulated Amortization	(84,610)	(80,282)
Estimated amortization expense
2020	5,096
2021	5,898
2022	2,173
2023	1,491
2024	201
Total	$ 14,859
Client relations
Finite-lived intangible assets
Weighted- Average Remaining Life (in Years)	3 years
Gross Amount	$ 58,708	56,779
Accumulated Amortization	$ (51,596)	(50,455)
Backlog
Finite-lived intangible assets
Weighted- Average Remaining Life (in Years)	10 months 24 days
Gross Amount	$ 33,618	32,229
Accumulated Amortization	$ (27,889)	(24,968)
Trade names
Finite-lived intangible assets
Weighted- Average Remaining Life (in Years)	1 year 9 months 18 days
Gross Amount	$ 7,143	7,714
Accumulated Amortization	$ (5,125)	$ (4,859)

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- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Section 50
-Paragraph 2
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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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-Publisher FASB
-Name Accounting Standards Codification
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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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