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Segment Information - Schedule of Total Revenues, Segment Operating Profit and Total Asset for Reporting Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 02, 2021	Jun. 26, 2020	Jul. 02, 2021	Jun. 26, 2020
Segment Reporting Information [Line Items]
Revenues	$ 3,576,436	$ 3,260,057	$ 10,506,144	$ 10,047,286
Total Segment Operating Profit	263,746	194,376	436,572	513,500
Restructuring, Transaction and Other Charges	(1,968)	(20,472)	(345,725)	(115,539)
Total Other (Expense) Income, net	19,648	109,305	88,650	(132,453)
Earnings from Continuing Operations Before Taxes	283,394	303,681	525,222	381,047
Amortization of intangible assets			103,308
Impairment of equity method investment and other long term assets			40,138	0
Worley
Segment Reporting Information [Line Items]
Fair value adjustments	38,700	1,000	102,200	15,200
Foreign currency revaluations		(123,100)		(119,000)
C3
Segment Reporting Information [Line Items]
Fair value adjustments	(1,000)		(49,600)
AWE Management Ltd
Segment Reporting Information [Line Items]
Impairment of equity method investment and other long term assets			38,900
Operating Segments
Segment Reporting Information [Line Items]
Total Segment Operating Profit	370,246	280,061	1,020,495	822,187
Corporate
Segment Reporting Information [Line Items]
Other Corporate Expenses	(104,532)	(65,213)	(238,198)	(193,148)
Corporate | Other Expense
Segment Reporting Information [Line Items]
Amortization of intangible assets	49,600	23,100	103,300	67,100
Critical Mission Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	1,218,089	1,211,143	3,822,949	3,636,978
Total Segment Operating Profit	108,131	89,608	332,133	264,323
People & Places Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	2,102,550	2,048,914	6,329,088	6,410,308
Total Segment Operating Profit	205,324	190,453	603,654	557,864
PA Consulting
Segment Reporting Information [Line Items]
One time charges	(2,800)		297,400
PA Consulting | Operating Segments
Segment Reporting Information [Line Items]
Revenues	255,797	0	354,107	0
Total Segment Operating Profit	$ 56,791	$ 0	$ 84,708	$ 0

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