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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. 31, 2017 | Apr. 01, 2016 | Mar. 31, 2017 | Apr. 01, 2016
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 2,302,567 | $ 2,781,763 | $ 4,854,171 | $ 5,629,697
Project Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,303,800 | 1,534,000 | 2,624,400 | 2,930,300
Process, Scientific, and Systems Consulting |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 194,400 | 156,500 | 401,200 | 415,400
Technical Professional Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,498,200 | 1,690,500 | 3,025,600 | 3,345,700
Construction |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 594,600 | 807,200 | 1,404,500 | 1,695,600
Operations and Maintenance ("O&M") |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 209,700 | 284,100 | 424,100 | 588,400
Field Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 804,300 | 1,091,300 | 1,828,600 | 2,284,000
Aerospace & Technology |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 577,040 | 669,464 | 1,154,476 | 1,339,655
Aerospace & Technology | Project Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 265,100 | 264,200 | 482,500 | 466,800
Aerospace & Technology | Process, Scientific, and Systems Consulting |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 184,900 | 140,000 | 384,800 | 382,900
Aerospace & Technology | Technical Professional Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 450,000 | 404,200 | 867,300 | 849,700
Aerospace & Technology | Construction |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 10,300 | 79,400 | 54,800 | 105,800
Aerospace & Technology | Operations and Maintenance ("O&M") |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 116,700 | 185,900 | 232,400 | 384,100
Aerospace & Technology | Field Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 127,000 | 265,300 | 287,200 | 489,900
Buildings & Infrastructure |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 585,242 | 579,128 | 1,165,859 | 1,142,458
Buildings & Infrastructure | Project Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 532,000 | 542,600 | 1,046,000 | 1,066,800
Buildings & Infrastructure | Technical Professional Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 532,000 | 542,600 | 1,046,000 | 1,066,800
Buildings & Infrastructure | Construction |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 49,600 | 24,400 | 112,500 | 50,900
Buildings & Infrastructure | Operations and Maintenance ("O&M") |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 3,600 | 12,200 | 7,400 | 24,800
Buildings & Infrastructure | Field Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 53,200 | 36,600 | 119,900 | 75,700
Industrial |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 582,458 | 666,556 | 1,334,196 | 1,338,656
Industrial | Project Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 166,900 | 218,100 | 383,300 | 424,300
Industrial | Technical Professional Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 166,900 | 218,100 | 383,300 | 424,300
Industrial | Construction |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 326,200 | 363,000 | 766,700 | 736,000
Industrial | Operations and Maintenance ("O&M") |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 89,400 | 85,400 | 184,200 | 178,400
Industrial | Field Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 415,600 | 448,400 | 950,900 | 914,400
Petroleum & Chemicals |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 557,827 | 866,615 | 1,199,640 | 1,808,928
Petroleum & Chemicals | Project Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 339,800 | 509,100 | 712,600 | 972,400
Petroleum & Chemicals | Process, Scientific, and Systems Consulting |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 9,500 | 16,500 | 16,400 | 32,500
Petroleum & Chemicals | Technical Professional Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 349,300 | 525,700 | 729,000 | 1,004,900
Petroleum & Chemicals | Construction |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 208,500 | 340,400 | 470,500 | 802,900
Petroleum & Chemicals | Operations and Maintenance ("O&M") |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 0 | 600 | 100 | 1,200
Petroleum & Chemicals | Field Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 208,500 | $ 341,000 | $ 470,600 | $ 804,000

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