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Segment Information - Schedule of Total Services Revenues for Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 30, 2016	Sep. 30, 2016	Jul. 01, 2016	Apr. 01, 2016	Jan. 01, 2016	Oct. 02, 2015	Jun. 26, 2015	Mar. 27, 2015	Dec. 26, 2014	Sep. 29, 2017	Sep. 30, 2016	Oct. 02, 2015
Segment Reporting Information [Line Items]
Revenues	$ 2,653,866	$ 2,514,751	$ 2,302,567	$ 2,551,604	$ 2,640,587	$ 2,693,873	$ 2,781,763	$ 2,847,934	$ 3,116,954	$ 2,907,541	$ 2,903,332	$ 3,187,005	$ 10,022,788	$ 10,964,157	$ 12,114,832
Aerospace & Technology
Segment Reporting Information [Line Items]
Revenues													2,360,613	2,657,433	2,924,753
Buildings & Infrastructure
Segment Reporting Information [Line Items]
Revenues													2,452,321	2,253,512	2,458,379
Industrial
Segment Reporting Information [Line Items]
Revenues													2,743,662	2,793,713	2,517,571
Petroleum & Chemicals
Segment Reporting Information [Line Items]
Revenues													2,466,192	3,259,499	$ 4,214,129
Project Services
Segment Reporting Information [Line Items]
Revenues													4,805,863	5,738,840
Project Services | Aerospace & Technology
Segment Reporting Information [Line Items]
Revenues													960,374	910,290
Project Services | Buildings & Infrastructure
Segment Reporting Information [Line Items]
Revenues													2,185,220	2,094,282
Project Services | Industrial
Segment Reporting Information [Line Items]
Revenues													196,171	891,018
Project Services | Petroleum & Chemicals
Segment Reporting Information [Line Items]
Revenues													1,464,098	1,843,250
Process, Scientific, and Systems Consulting
Segment Reporting Information [Line Items]
Revenues													805,144	852,329
Process, Scientific, and Systems Consulting | Aerospace & Technology
Segment Reporting Information [Line Items]
Revenues													774,063	803,654
Process, Scientific, and Systems Consulting | Petroleum & Chemicals
Segment Reporting Information [Line Items]
Revenues													31,081	48,675
Technical Professional Services
Segment Reporting Information [Line Items]
Revenues													5,611,007	6,591,169
Technical Professional Services | Aerospace & Technology
Segment Reporting Information [Line Items]
Revenues													1,734,437	1,713,944
Technical Professional Services | Buildings & Infrastructure
Segment Reporting Information [Line Items]
Revenues													2,185,220	2,094,282
Technical Professional Services | Industrial
Segment Reporting Information [Line Items]
Revenues													196,171	891,018
Technical Professional Services | Petroleum & Chemicals
Segment Reporting Information [Line Items]
Revenues													1,495,179	1,891,925
Construction
Segment Reporting Information [Line Items]
Revenues													3,374,261	3,258,890
Construction | Aerospace & Technology
Segment Reporting Information [Line Items]
Revenues													250,956	171,614
Construction | Buildings & Infrastructure
Segment Reporting Information [Line Items]
Revenues													254,118	119,463
Construction | Industrial
Segment Reporting Information [Line Items]
Revenues													1,901,299	1,601,562
Construction | Petroleum & Chemicals
Segment Reporting Information [Line Items]
Revenues													967,888	1,366,251
Operations and Maintenance ("O&M")
Segment Reporting Information [Line Items]
Revenues													1,037,520	1,114,098
Operations and Maintenance ("O&M") | Aerospace & Technology
Segment Reporting Information [Line Items]
Revenues													375,220	771,875
Operations and Maintenance ("O&M") | Buildings & Infrastructure
Segment Reporting Information [Line Items]
Revenues													12,983	39,767
Operations and Maintenance ("O&M") | Industrial
Segment Reporting Information [Line Items]
Revenues													646,192	301,133
Operations and Maintenance ("O&M") | Petroleum & Chemicals
Segment Reporting Information [Line Items]
Revenues													3,125	1,323
Field Services
Segment Reporting Information [Line Items]
Revenues													4,411,781	4,372,988
Field Services | Aerospace & Technology
Segment Reporting Information [Line Items]
Revenues													626,176	943,489
Field Services | Buildings & Infrastructure
Segment Reporting Information [Line Items]
Revenues													267,101	159,230
Field Services | Industrial
Segment Reporting Information [Line Items]
Revenues													2,547,491	1,902,695
Field Services | Petroleum & Chemicals
Segment Reporting Information [Line Items]
Revenues													$ 971,013	$ 1,367,574

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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