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Restructuring and Other Charges - Summary of Restructuring and Other Charges Impacts on Reportable Segment Income by Line of Business (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 27, 2019
Dec. 28, 2018
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges $ 52,041  
Restructuring and other charges 49,663 $ 47,234
CH2M HILL Companies, Ltd.    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges 52,041 39,401
CH2M HILL Companies, Ltd. | Continuing Operations    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges 52,041 45,059
Restructuring and other charges 49,700 47,200
CH2M HILL Companies, Ltd. | Corporate    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges 37,597 33,386
CH2M HILL Companies, Ltd. | Aerospace, Technology and Nuclear | Operating Segments    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges 4,291 449
CH2M HILL Companies, Ltd. | Buildings, Infrastructure and Advanced Facilities | Operating Segments    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges 10,153 11,224
CH2M HILL Companies, Ltd. | Energy, Chemicals and Resources | Operating Segments    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges 0 $ (5,658)
Other Expense | CH2M HILL Companies, Ltd. | Corporate    
Restructuring Cost and Reserve [Line Items]    
Gain (loss) related to settlement $ 2,200