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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. 26, 2025 | Sep. 27, 2024 | Sep. 26, 2025 | Sep. 27, 2024 | Sep. 29, 2023
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  | $ 61,316 |  |
AWE ML |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Gain on termination of lease |  |  |  |  | $ 3,400
Interest Rate Swap |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Derivative, gain on derivative | $ 35,200 | $ 35,200 |  | $ 35,200 |
Operating Segments | Employee Separation Costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  |  | 6,400 |
CH2M HILL Companies, Ltd. |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  | 61,316 | 134,911 | 126,219
Impairment of real estate including other moving costs |  |  | 49,100 |  |
CH2M HILL Companies, Ltd. | SG&A Expense |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  | $ 61,316 | $ 169,844 | $ 129,596
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Operating Profit | Operating Profit | Selling, General and Administrative Expense
CH2M HILL Companies, Ltd. | Other (Income), net |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  | $ 0 | $ (34,933) | $ (3,377)
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Nonoperating Income (Expense) | Nonoperating Income (Expense) | Nonoperating Income (Expense)
CH2M HILL Companies, Ltd. | Professional Services and Employee Separation Costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  | $ 58,800 | $ 163,400 | $ 61,100
CH2M HILL Companies, Ltd. | Employee Separation Costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  |  |  | 14,300
CH2M HILL Companies, Ltd. | PA Consulting | Employee Separation Costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  | 2,200 | 6,400 | 14,300
CH2M HILL Companies, Ltd. | Operating Segments | Infrastructure & Advanced Facilities |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  | 59,092 | 128,529 | 111,513
CH2M HILL Companies, Ltd. | Operating Segments | PA Consulting |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  | $ 2,224 | $ 6,382 | $ 14,706

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