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Goodwill and Intangibles - Narrative (Details) $ in Thousands	3 Months Ended			12 Months Ended
	Mar. 30, 2018 Business	Dec. 30, 2016 USD ($)	Mar. 27, 2015 Business	Sep. 28, 2018 USD ($) segment	Sep. 29, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 29, 2017 USD ($)
Finite-Lived Intangible Assets [Line Items]
Number of operating and reporting structure of business	3		4	3
Overall foreign currency translation adjustment		$ (140,500)		$ 109,877	$ 140,527	$ 46,515
CH2M HILL Companies, Ltd.
Finite-Lived Intangible Assets [Line Items]
Lease intangible liabilities				$ 8,700			$ 9,600
Goodwill Adjustment
Finite-Lived Intangible Assets [Line Items]
Overstatement adjustment of financial statements line item		209,900
Other Comprehensive Income Adjustment
Finite-Lived Intangible Assets [Line Items]
Overstatement adjustment of financial statements line item		$ 33,800

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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
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Amount of each individual error being corrected in the correcting adjustment.

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