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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	9 Months Ended
	Jun. 28, 2019 USD ($)
Goodwill [Roll Forward]
Balance at the beginning of the period	$ 4,795,856
Acquired	602,000
Post-Acquisition Adjustments	(14,000)
Foreign Exchange Impact	(13,000)
Balance at the end of the period	5,370,741
Aerospace, Technology and Nuclear
Goodwill [Roll Forward]
Balance at the beginning of the period	1,581,000
Acquired	602,000
Post-Acquisition Adjustments	(10,000)
Foreign Exchange Impact	(4,000)
Balance at the end of the period	2,169,000
Buildings, Infrastructure and Advanced Facilities
Goodwill [Roll Forward]
Balance at the beginning of the period	3,215,000
Acquired	0
Post-Acquisition Adjustments	(4,000)
Foreign Exchange Impact	(9,000)
Balance at the end of the period	$ 3,202,000

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 increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ 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 (b)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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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

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