Segment Information - Schedule of Total Revenues, Operating Profit and Total Asset for Reporting Segment (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	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. 26, 2014	Jun. 27, 2014	Mar. 28, 2014	Dec. 27, 2013	Sep. 30, 2016	Oct. 02, 2015	Sep. 26, 2014
Segment Reporting Information [Line Items]
Revenues from External Customers:	$ 2,640,587	$ 2,693,873	$ 2,781,763	$ 2,847,934	$ 3,116,954	$ 2,907,541	$ 2,903,332	$ 3,187,005	$ 3,218,442	$ 3,231,791	$ 3,176,033	$ 3,068,891	$ 10,964,157	$ 12,114,832	$ 12,695,157
Operating Profit	82,811	109,556	86,781	59,450	53,825	100,434	133,045	$ 158,223	136,650	123,937	$ 122,434	$ 145,047	338,598	445,527	528,068
Restructuring Charges	$ 36,000	$ 25,800	$ 25,700	$ 48,100	$ 68,200	$ 30,100	$ 9,600		$ 30,400	$ 47,000			187,907	157,200	93,300
Loss on disposal of business and investments													(41,410)	(2,909)	12,147
Total Other Expense													(10,465)	(12,481)	1,951
Earnings Before Taxes													286,723	430,137	542,166
Operating Segments
Segment Reporting Information [Line Items]
Operating Profit													586,328	615,549	600,815
Corporate Non-Segment
Segment Reporting Information [Line Items]
Other Corporate Items													(60,100)	(15,739)	20,583
Restructuring Charges													41,816
Segment Reconciling Items
Segment Reporting Information [Line Items]
Restructuring Charges													(187,630)	(154,283)	(93,330)
Petroleum & Chemicals
Segment Reporting Information [Line Items]
Revenues from External Customers:													3,259,499	4,214,129	4,727,116
Petroleum & Chemicals | Operating Segments
Segment Reporting Information [Line Items]
Operating Profit													126,604	138,351	162,462
Restructuring Charges													87,188
Aerospace & Technology
Segment Reporting Information [Line Items]
Revenues from External Customers:													2,657,433	2,924,753	2,306,453
Aerospace & Technology | Operating Segments
Segment Reporting Information [Line Items]
Operating Profit													203,808	205,368	139,684
Restructuring Charges													5,835
Buildings & Infrastructure
Segment Reporting Information [Line Items]
Revenues from External Customers:													2,253,512	2,458,379	2,705,197
Buildings & Infrastructure | Operating Segments
Segment Reporting Information [Line Items]
Operating Profit													174,648	145,299	164,439
Restructuring Charges													23,378
Industrial
Segment Reporting Information [Line Items]
Revenues from External Customers:													2,793,713	2,517,571	2,956,391
Industrial | Operating Segments
Segment Reporting Information [Line Items]
Operating Profit													81,268	$ 126,531	$ 134,230
Restructuring Charges													$ 29,690