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Goodwill and Intangibles - Schedule of Carrying Value of Goodwill by Reportable Segment Appearing in Accompanying Consolidated Balance Sheets (Details) $ in Thousands	3 Months Ended
	Dec. 27, 2019 USD ($)
Goodwill [Roll Forward]
Balance at the beginning of the period	$ 5,432,544
Post-Acquisition Adjustments	1,000
Foreign Exchange Impact	3,000
Balance at the end of the period	5,437,422
Critical Mission Solutions
Goodwill [Roll Forward]
Balance at the beginning of the period	2,202,000
Post-Acquisition Adjustments	1,000
Foreign Exchange Impact	1,000
Balance at the end of the period	2,204,000
People & Places Solutions
Goodwill [Roll Forward]
Balance at the beginning of the period	3,231,000
Post-Acquisition Adjustments	0
Foreign Exchange Impact	2,000
Balance at the end of the period	$ 3,233,000

X

- Definition

Goodwill, Adjustments During Period

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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X

- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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