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Income Taxes - Narrative (Details) - USD ($) $ in Millions		3 Months Ended
	Dec. 22, 2018	Dec. 27, 2019	Dec. 28, 2018
Income Tax Contingency [Line Items]
Effective income tax rate (percent)		27.00%	24.70%
Favorable settlement with the Indian Revenue Service		$ 3.7
Benefit from IRC section 179D		$ 3.5
Measurement period		1 year
Income tax expense for the measurement period	$ 144.4
Cumulative transition taxes during the measurement period		$ 14.3
CH2M HILL Companies, Ltd.
Income Tax Contingency [Line Items]
Income tax expense for the measurement period	$ 104.2

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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