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Restructuring and Other Charges - Summary of Restructuring and Other Activities by Major Type of Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 28, 2018
Sep. 29, 2017
Sep. 30, 2016
Restructuring Cost and Reserve [Line Items]      
Gain (Loss) on disposal of business and investments $ (20,967) $ 10,058 $ (41,410)
CH2M HILL Companies, Ltd.      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 190,806 135,438 187,907
CH2M HILL Companies, Ltd. | Lease Abandonments      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 53,914 55,647 92,643
CH2M HILL Companies, Ltd. | Involuntary Terminations      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 37,063 43,667 85,599
CH2M HILL Companies, Ltd. | Outside Services      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 36,308 4,236 7,398
CH2M HILL Companies, Ltd. | Other      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 63,521 $ 31,888 $ 2,267
Gain (Loss) on disposal of business and investments $ (21,000)