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Segment Information - Schedule of Total Revenues, Segment Operating Profit and Total Asset for Reporting Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 28, 2018
Jun. 29, 2018
Mar. 30, 2018
Dec. 29, 2017
Sep. 29, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 30, 2016
Sep. 30, 2016
Jul. 01, 2016
Apr. 01, 2016
Jan. 01, 2016
Sep. 28, 2018
Sep. 29, 2017
Sep. 30, 2016
Segment Reporting Information [Line Items]                              
Revenues $ 4,142,644 $ 4,156,663 $ 3,935,028 $ 2,750,311 $ 2,653,866 $ 2,514,751 $ 2,302,567 $ 2,551,604 $ 2,640,587 $ 2,693,873 $ 2,781,763 $ 2,847,934 $ 14,984,646 $ 10,022,788 $ 10,964,157
Total Segment Operating Profit $ 241,312 212,729 $ 146,286 47,644 $ 106,993 $ 128,475 $ 68,173 88,628 82,811 109,556 86,781 59,450 647,971 392,269 338,598
Restructuring and Other Charges   $ (43,900)   $ (87,000)       $ (31,700)         (170,148) (134,206) (187,630)
(Gain) loss on sales of businesses and investments                         20,967 (10,880) 41,410
Total Other (Expense) Income, net                         (72,299) (9,932) (10,465)
Earnings Before Taxes                         554,705 393,217 286,723
Restructuring charges excluded segment profit                 $ 36,000 $ 25,800 $ 25,700 $ 48,100 190,806    
CH2M HILL Companies, Ltd.                              
Segment Reporting Information [Line Items]                              
Transaction Costs                         (80,436) (17,100) 0
Restructuring charges excluded segment profit                         190,806 135,438 187,907
Operating Segments                              
Segment Reporting Information [Line Items]                              
Total Segment Operating Profit                         1,012,257 625,170 586,328
Corporate                              
Segment Reporting Information [Line Items]                              
Other Corporate Expenses                         (113,702) (81,595) (60,100)
Corporate | CH2M HILL Companies, Ltd.                              
Segment Reporting Information [Line Items]                              
Restructuring charges excluded segment profit                         77,148 42,781 41,816
Aerospace, Technology, Environmental and Nuclear | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenues                         4,372,008 2,464,363 2,845,913
Total Segment Operating Profit                         311,871 200,179 215,119
Litigation expenses included in segment profit                         15,000    
Aerospace, Technology, Environmental and Nuclear | Operating Segments | CH2M HILL Companies, Ltd.                              
Segment Reporting Information [Line Items]                              
Restructuring charges excluded segment profit                         20,254 2,356 8,210
Buildings, Infrastructure and Advanced Facilities | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenues                         6,184,883 3,830,697 3,419,505
Total Segment Operating Profit                         482,277 263,679 217,412
Restructuring charges excluded segment profit                           23,800  
Buildings, Infrastructure and Advanced Facilities | Operating Segments | CH2M HILL Companies, Ltd.                              
Segment Reporting Information [Line Items]                              
Restructuring charges excluded segment profit                         56,238 47,743 24,566
Energy, Chemicals and Resources | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenues                         4,427,755 3,727,728 4,698,739
Total Segment Operating Profit                         218,109 161,312 153,797
Energy, Chemicals and Resources | Operating Segments | CH2M HILL Companies, Ltd.                              
Segment Reporting Information [Line Items]                              
Restructuring charges excluded segment profit                         37,166 42,558 113,315
Other Expense | CH2M HILL Companies, Ltd.                              
Segment Reporting Information [Line Items]                              
Amortization of deferred financing fees                         $ 1,800 $ 1,200 $ 277