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Restructuring and Other Charges - Schedule of Restructuring and Other Charges Impacts on Reportable Segment Income by Line of Business (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 29, 2024
Mar. 31, 2023
Mar. 29, 2024
Mar. 31, 2023
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges     $ 83,248  
CH2M HILL Companies, Ltd.        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges $ 41,928 $ 12,840 83,297 $ 47,284
CH2M HILL Companies, Ltd. | Operating profit (mainly SG&A)        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges 41,928 12,873 83,297 47,945
Real estate impairment and other moving cost   11,000   38,700
CH2M HILL Companies, Ltd. | Operating profit (mainly SG&A) | Professional Services and Employee Seperation        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges 38,900   79,100  
CH2M HILL Companies, Ltd. | Other Income, net        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges 0 (33) 0 (661)
CH2M HILL Companies, Ltd. | Corporate        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges 27,724 2,289 56,726 5,622
CH2M HILL Companies, Ltd. | Critical Mission Solutions | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges 4,738 1,052 6,901 3,264
CH2M HILL Companies, Ltd. | People & Places Solutions | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges 5,655 5,869 13,784 33,186
CH2M HILL Companies, Ltd. | Divergent Solutions | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges 827 3,630 1,727 5,212
CH2M HILL Companies, Ltd. | PA Consulting | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges $ 2,984 $ 0 $ 4,159 $ 0