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Restructuring and Other Charges - Narrative (Details) $ in Millions		3 Months Ended			6 Months Ended
	Oct. 21, 2018 USD ($)	Mar. 29, 2019 USD ($)	Mar. 30, 2018 USD ($)	Mar. 27, 2015 Business	Mar. 29, 2019 USD ($)	Mar. 30, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Number of lines of business | Business				4
ECR Business
Restructuring Cost and Reserve [Line Items]
Restructuring charges, pre-tax, gross		$ 0.8			$ (5.8)
Integration related activities		31.6			37.0
Restructuring pre-tax net charges		32.4			31.2
Liabilities held for sale		21.1			21.1
CH2M HILL Companies, Ltd.
Restructuring Cost and Reserve [Line Items]
Restructuring charges, pre-tax, gross		49.6	$ 55.2		64.3	$ 60.7
Integration related activities	$ 3,300.0	(12.3)	14.1		13.5	28.0
Restructuring pre-tax net charges		$ 37.3	$ 69.3		$ 77.8	$ 88.7

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