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Segment Information - Schedule of Total Revenues, Segment Operating Profit and Total Asset for Reporting Segment (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 29, 2023 | Dec. 30, 2022
Segment Reporting Information [Line Items] |  |
Revenues | $ 4,159,225 | $ 3,798,668
Total Segment Operating Profit | 204,063 | 237,805
Restructuring, Transaction and Other Charges | (55,318) | (40,342)
Total Other Expense, net | (38,314) | (40,324)
Earnings from Continuing Operations Before Taxes | 165,749 | 197,481
Inventory | 15,000 |
Amortization of intangible assets | 51,119 |
Intangible impairment charge | 10,000 |
One-time benefit program changes |  | 41,000
Restructuring charges | 41,320 |
Real estate related impairments and other transformation |  | 27,100
Professional Services and Employee Seperation |  |
Segment Reporting Information [Line Items] |  |
Restructuring, Transaction and Other Charges | (11,000) |
CH2M HILL Companies, Ltd. |  |
Segment Reporting Information [Line Items] |  |
Restructuring charges | 41,369 | 34,443
Operating profit (mainly SG&A) | CH2M HILL Companies, Ltd. |  |
Segment Reporting Information [Line Items] |  |
Restructuring charges | 41,369 | 35,072
Operating profit (mainly SG&A) | CH2M HILL Companies, Ltd. | Professional Services and Employee Seperation |  |
Segment Reporting Information [Line Items] |  |
Restructuring charges | 40,100 |
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total Segment Operating Profit | 380,441 | 371,833
Corporate |  |
Segment Reporting Information [Line Items] |  |
Other Corporate Expenses | (121,060) | (93,686)
Corporate | CH2M HILL Companies, Ltd. |  |
Segment Reporting Information [Line Items] |  |
Restructuring charges | 29,002 | 3,333
Corporate | Other Expense |  |
Segment Reporting Information [Line Items] |  |
Amortization of intangible assets |  | 49,800
Critical Mission Solutions | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Revenues | 1,128,603 | 1,075,175
Total Segment Operating Profit | 93,407 | 82,220
Critical Mission Solutions | Operating Segments | CH2M HILL Companies, Ltd. |  |
Segment Reporting Information [Line Items] |  |
Restructuring charges | 2,163 | 2,212
People & Places Solutions | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Revenues | 2,470,441 | 2,226,985
Total Segment Operating Profit | 224,998 | 226,619
Divergent Solutions | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Revenues | 254,180 | 214,465
Total Segment Operating Profit | 7,581 | 11,967
Divergent Solutions | Operating Segments | CH2M HILL Companies, Ltd. |  |
Segment Reporting Information [Line Items] |  |
Restructuring charges | 900 | 1,581
PA Consulting | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Revenues | 306,001 | 282,043
Total Segment Operating Profit | 54,455 | 51,027
PA Consulting | Operating Segments | CH2M HILL Companies, Ltd. |  |
Segment Reporting Information [Line Items] |  |
Restructuring charges | $ 1,175 | $ 0

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