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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 12 Months Ended
Sep. 27, 2024
Sep. 27, 2024
Sep. 29, 2023
Sep. 30, 2022
Restructuring Cost and Reserve [Line Items]        
Restructuring charges   $ 134,862    
Recorded third-party environmental recoveries receivable       $ 27,000
Gain on termination of lease       8,700
AWE ML        
Restructuring Cost and Reserve [Line Items]        
Gain on termination of lease     $ 3,400 8,700
Interest Rate Swap        
Restructuring Cost and Reserve [Line Items]        
Derivative, gain on derivative $ 35,200 35,200    
Operating Segments | Professional Services and Employee Separation Costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges   163,400 61,100  
Operating Segments | Employee Separation Costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges   6,400 14,300  
CH2M HILL Companies, Ltd.        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges   134,911 126,219 159,130
Impairment of real estate including other moving costs     49,100 77,000
Pre-tax settlement less insurance recoveries       91,300
CH2M HILL Companies, Ltd. | SG&A Expense        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges   $ 169,844 $ 129,596 $ 167,798
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]   Total Segment Operating Profit Total Segment Operating Profit Selling, General and Administrative Expense
CH2M HILL Companies, Ltd. | Other (Income) Expense, net        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges   $ (34,933) $ (3,377) $ (8,668)
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]   Nonoperating Income (Expense) Nonoperating Income (Expense) Nonoperating Income (Expense)
CH2M HILL Companies, Ltd. | PA Consulting | Employee Separation Costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges   $ 6,400 $ 14,300  
CH2M HILL Companies, Ltd. | Operating Segments | Infrastructure & Advanced Facilities        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges   128,529 111,513 $ 154,877
CH2M HILL Companies, Ltd. | Operating Segments | PA Consulting        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges   $ 6,382 $ 14,706 $ 4,253