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Restructuring and Other Charges - Narrative (Details) $ in Millions	3 Months Ended				9 Months Ended
	Jun. 29, 2018 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Mar. 27, 2015 Business	Jun. 29, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring pre-tax net charges			$ 22.6
Net realizable value write-offs on contract accounts receivables		$ 16.5
Statutory redundancy and severance costs		1.4
Other liabilities		$ 4.7
Number of lines of business | Business				4
CH2M HILL Companies, Ltd.
Restructuring Cost and Reserve [Line Items]
Restructuring pre-tax net charges	$ 33.9				$ 94.6
Integration related costs	$ 12.6				$ 40.6

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