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Restructuring and Other Charges - Summary of Restructuring and Other Activities by Major Type of Costs (Details) - CH2M HILL Companies, Ltd. - USD ($)
$ in Thousands
3 Months Ended
Dec. 29, 2017
Dec. 30, 2016
Restructuring Cost And Reserve [Line Items]    
Restructuring costs $ 19,349 $ 31,741
Lease Abandonments    
Restructuring Cost And Reserve [Line Items]    
Restructuring costs 3,363 17,555
Involuntary Terminations    
Restructuring Cost And Reserve [Line Items]    
Restructuring costs 2,184 11,332
Outside Services    
Restructuring Cost And Reserve [Line Items]    
Restructuring costs 8,590 1,291
Other Restructuring Related    
Restructuring Cost And Reserve [Line Items]    
Restructuring costs $ 5,212 $ 1,563