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Pension and Other Postretirement Benefit Plans - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 29, 2017
Defined Benefit Plan Disclosure [Line Items]
(Gain) Loss on pension and retiree medical plan changes	$ 33,087	$ (5,414)	$ 9,955
Total Other Non-current Assets
Defined Benefit Plan Disclosure [Line Items]
Restricted investments			7,700
Employee loans receivable			2,200
SG&A Expense
Defined Benefit Plan Disclosure [Line Items]
Service cost		24,200	13,500
One-time, non-cash benefit			9,900
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Period of annual average returns used in return on plan assets simulation model (in years)	20 years
Service cost	$ 2,784	4,765	1,000
Curtailments/settlements/plan amendments	9,751	9,434
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	7,171	8,269	$ 7,509
Curtailments/settlements/plan amendments	5,814	5,496
US-GAAP Accounting Standards Update201707 | SG&A Expense
Defined Benefit Plan Disclosure [Line Items]
Service cost	24,400
CH2M HILL Companies, Ltd. | Other | Other Expense
Defined Benefit Plan Disclosure [Line Items]
Litigation settlement, expense	35,000
United Kingdom | Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, increase (decrease) due to pension ruling	1,500
United Kingdom | Non-U.S. Plans | Other Comprehensive Income (Loss)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, increase (decrease) due to pension ruling	38,200
Sverdrup and Ireland Pension Plans | CH2M Retiree Medical and Ireland | Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
(Gain) Loss on pension and retiree medical plan changes	$ (33,100)
Sverdrup and Ireland Pension Plans | Sverdrup and Ireland | Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
(Gain) Loss on pension and retiree medical plan changes		$ (5,400)

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