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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. 26, 2026 | Jun. 27, 2025 | Jun. 26, 2026 | Jun. 27, 2025
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | $ 21,395 | $ 22,254 | $ 39,565 | $ 47,657
Professional Services and Employee Seperation |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | 7,600 | 22,000 | 17,500 | 47,100
PA Consulting Group Limited |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | 13,800 |  | 22,000 |
PA Consulting Group Limited | Professional Services and Dedicated Internal Personnel |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | 13,800 |  | 22,000 |
Operating Segments | Infrastructure & Advanced Facilities |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | 7,627 | 22,254 | 17,518 | 47,398
Operating Segments | PA Consulting |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | $ 13,768 | $ 0 | $ 22,047 | $ 259

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