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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

X

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045

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+ References

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