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Segment Information - Schedule of Total Services Revenues for Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 30, 2018 | Mar. 31, 2017 | Mar. 30, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 3,935,028 | $ 2,302,567 | $ 6,685,338 | $ 4,854,171
Technical Professional Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 2,444,823 | 1,355,776 | 4,054,916 | 2,620,713
Project Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,928,550 | 1,161,327 | 3,287,570 | 2,219,518
Process, Scientific, and Systems Consulting |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 516,273 | 194,449 | 767,346 | 401,195
Field Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,490,205 | 946,791 | 2,630,422 | 2,233,458
Construction |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 984,897 | 722,469 | 1,858,466 | 1,669,416
Operations and Maintenance ("O&M") |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 505,308 | 224,322 | 771,956 | 564,042
Aerospace, Technology, Environmental and Nuclear |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,105,673 | 602,043 | 1,851,594 | 1,205,228
Aerospace, Technology, Environmental and Nuclear | Technical Professional Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 821,166 | 399,953 | 1,324,690 | 771,634
Aerospace, Technology, Environmental and Nuclear | Project Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 313,937 | 215,009 | 573,332 | 386,861
Aerospace, Technology, Environmental and Nuclear | Process, Scientific, and Systems Consulting |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 507,229 | 184,944 | 751,358 | 384,773
Aerospace, Technology, Environmental and Nuclear | Field Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 284,507 | 202,090 | 526,904 | 433,594
Aerospace, Technology, Environmental and Nuclear | Construction |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 79,473 | 65,648 | 223,113 | 172,210
Aerospace, Technology, Environmental and Nuclear | Operations and Maintenance ("O&M") |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 205,034 | 136,442 | 303,791 | 261,384
Buildings, Infrastructure and Advanced Facilities |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,758,412 | 897,829 | 2,790,177 | 1,836,723
Buildings, Infrastructure and Advanced Facilities | Technical Professional Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,359,973 | 641,316 | 2,156,033 | 1,294,280
Buildings, Infrastructure and Advanced Facilities | Project Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,356,998 | 636,698 | 2,151,562 | 1,287,949
Buildings, Infrastructure and Advanced Facilities | Process, Scientific, and Systems Consulting |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 2,975 | 4,618 | 4,471 | 6,331
Buildings, Infrastructure and Advanced Facilities | Field Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 398,439 | 256,513 | 634,144 | 542,443
Buildings, Infrastructure and Advanced Facilities | Construction |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 397,487 | 254,216 | 632,609 | 535,397
Buildings, Infrastructure and Advanced Facilities | Operations and Maintenance ("O&M") |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 952 | 2,297 | 1,535 | 7,046
Energy, Chemicals and Resources |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,070,943 | 802,695 | 2,043,567 | 1,812,220
Energy, Chemicals and Resources | Technical Professional Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 263,684 | 314,507 | 574,193 | 554,799
Energy, Chemicals and Resources | Project Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 257,615 | 309,620 | 562,676 | 544,708
Energy, Chemicals and Resources | Process, Scientific, and Systems Consulting |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 6,069 | 4,887 | 11,517 | 10,091
Energy, Chemicals and Resources | Field Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 807,259 | 488,188 | 1,469,374 | 1,257,421
Energy, Chemicals and Resources | Construction |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 507,937 | 402,605 | 1,002,744 | 961,809
Energy, Chemicals and Resources | Operations and Maintenance ("O&M") |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 299,322 | $ 85,583 | $ 466,630 | $ 295,612

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