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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 9 Months Ended
Jun. 28, 2024
Jun. 30, 2023
Jun. 28, 2024
Jun. 30, 2023
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges     $ 141,336  
CH2M HILL Companies, Ltd.        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges $ 58,088 $ 30,912 141,385 $ 78,196
Real estate impairment and other moving cost       40,000
CH2M HILL Companies, Ltd. | Professional Services and Employee Seperation        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges 54,800 17,200 133,900  
CH2M HILL Companies, Ltd. | Employee Separation Costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges   17,200   17,200
CH2M HILL Companies, Ltd. | Separation Transaction        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges   13,400   13,400
CH2M HILL Companies, Ltd. | Operating profit (mainly SG&A)        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges 58,088 31,184 141,385 79,129
CH2M HILL Companies, Ltd. | Other Income, net        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges 0 (272) 0 (933)
CH2M HILL Companies, Ltd. | Corporate        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges 35,323 14,109 92,049 19,731
CH2M HILL Companies, Ltd. | Critical Mission Solutions | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges 5,801 (1,128) 12,702 2,136
CH2M HILL Companies, Ltd. | People & Places Solutions | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges 11,415 703 25,199 33,889
CH2M HILL Companies, Ltd. | Divergent Solutions | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges 2,348 100 4,075 5,312
CH2M HILL Companies, Ltd. | PA Consulting | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other charges $ 3,201 $ 17,128 $ 7,360 $ 17,128