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Segment Information - Schedule of Total Services Revenues for Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 29, 2018 | Jun. 30, 2017 | Jun. 29, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 4,156,663 | $ 2,514,751 | $ 10,842,001 | $ 7,368,922
Technical Professional Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 2,459,495 | 1,403,483 | 6,585,779 | 4,024,196
Project Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 2,133,367 | 1,204,528 | 5,736,434 | 3,424,046
Process, Scientific, and Systems Consulting |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 326,128 | 198,955 | 849,345 | 600,150
Field Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,697,168 | 1,111,268 | 4,256,222 | 3,344,726
Construction |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,288,977 | 842,219 | 3,228,068 | 2,511,635
Operations and Maintenance ("O&M") |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 408,191 | 269,049 | 1,028,154 | 833,091
Aerospace, Technology, Environmental and Nuclear |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,221,306 | 610,643 | 3,072,900 | 1,815,871
Aerospace, Technology, Environmental and Nuclear | Technical Professional Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 908,465 | 423,243 | 2,238,786 | 1,194,877
Aerospace, Technology, Environmental and Nuclear | Project Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 592,290 | 232,288 | 1,415,382 | 619,149
Aerospace, Technology, Environmental and Nuclear | Process, Scientific, and Systems Consulting |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 316,175 | 190,955 | 823,404 | 575,728
Aerospace, Technology, Environmental and Nuclear | Field Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 312,841 | 187,400 | 834,114 | 620,994
Aerospace, Technology, Environmental and Nuclear | Construction |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 175,154 | 82,295 | 478,893 | 254,505
Aerospace, Technology, Environmental and Nuclear | Operations and Maintenance ("O&M") |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 137,687 | 105,105 | 355,221 | 366,489
Buildings, Infrastructure and Advanced Facilities |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,707,072 | 987,159 | 4,497,249 | 2,823,882
Buildings, Infrastructure and Advanced Facilities | Technical Professional Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,268,175 | 707,477 | 3,420,108 | 2,001,757
Buildings, Infrastructure and Advanced Facilities | Project Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,265,193 | 704,940 | 3,412,655 | 1,992,889
Buildings, Infrastructure and Advanced Facilities | Process, Scientific, and Systems Consulting |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 2,982 | 2,537 | 7,453 | 8,868
Buildings, Infrastructure and Advanced Facilities | Field Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 438,897 | 279,682 | 1,077,141 | 822,125
Buildings, Infrastructure and Advanced Facilities | Construction |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 433,270 | 276,013 | 1,065,879 | 811,410
Buildings, Infrastructure and Advanced Facilities | Operations and Maintenance ("O&M") |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 5,627 | 3,669 | 11,262 | 10,715
Energy, Chemicals and Resources |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,228,285 | 916,949 | 3,271,852 | 2,729,169
Energy, Chemicals and Resources | Technical Professional Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 282,855 | 272,763 | 926,885 | 827,562
Energy, Chemicals and Resources | Project Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 275,884 | 267,300 | 908,397 | 812,008
Energy, Chemicals and Resources | Process, Scientific, and Systems Consulting |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 6,971 | 5,463 | 18,488 | 15,554
Energy, Chemicals and Resources | Field Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 945,430 | 644,186 | 2,344,967 | 1,901,607
Energy, Chemicals and Resources | Construction |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 680,553 | 483,911 | 1,683,296 | 1,445,720
Energy, Chemicals and Resources | Operations and Maintenance ("O&M") |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 264,877 | $ 160,275 | $ 661,671 | $ 455,887

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