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Goodwill and Intangibles - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Jun. 29, 2018	Jun. 30, 2017	Dec. 30, 2016	Jun. 29, 2018	Jun. 30, 2017	Dec. 29, 2017
Finite-Lived Intangible Assets [Line Items]
Overall foreign currency translation adjustment	$ 114,044	$ (66,763)	$ (287,500)	$ 86,350	$ 179,320
CH2M HILL Companies, Ltd.
Finite-Lived Intangible Assets [Line Items]
Lease intangible liabilities	$ 9,000			$ 9,000		$ 9,600
Goodwill Adjustment
Finite-Lived Intangible Assets [Line Items]
Overstatement adjustment of financial statements line item			$ 209,900

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- Definition

Amount before tax, after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 20
-Section 35
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=82918529&loc=d3e30304-110892

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-Name Accounting Standards Codification
-Topic 220
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Amount of each individual error being corrected in the correcting adjustment.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section S99
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