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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. 01, 2022	Apr. 01, 2022	Jul. 02, 2021	Jul. 01, 2022	Jul. 02, 2021
Segment Reporting Information [Line Items]
Revenues	$ 3,827,093		$ 3,576,436	$ 11,041,777	$ 10,506,144
Total Segment Operating Profit	265,762		263,746	609,310	436,572
Restructuring, Transaction and Other Charges	(10,150)		(1,968)	(210,986)	(345,725)
Total Other (Expense) Income, net	6,353		19,648	(12,825)	88,650
Earnings from Continuing Operations Before Taxes	272,115		283,394	596,485	525,222
Amortization of intangible assets				146,889
Other transformation and other charges				24,500
Impairment of long-lived assets and equity method investment				74,585	40,138
Gain on investment in equity securities				13,862	152,145
Disposal of investment in equity securities	(13,900)			(13,862)	(52,021)
JKC Australia LNG Pty Limited | Settled Litigation
Segment Reporting Information [Line Items]
Loss related to settlement		$ 91,300		91,300
Worley
Segment Reporting Information [Line Items]
Gain (loss) on investments			38,700		102,200
C3
Segment Reporting Information [Line Items]
Gain (loss) on investments			1,000		49,600
AWE Management Ltd
Segment Reporting Information [Line Items]
Impairment of long-lived assets and equity method investment			38,900		38,900
Gain on termination of lease				7,100
Operating Segments
Segment Reporting Information [Line Items]
Total Segment Operating Profit	365,799		370,246	1,104,775	1,020,495
Corporate
Segment Reporting Information [Line Items]
Other Corporate Expenses	(89,887)		(104,532)	(284,479)	(238,198)
Corporate | Other Expense
Segment Reporting Information [Line Items]
Amortization of intangible assets	51,600		49,600	146,900	103,300
Critical Mission Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	1,317,109		1,218,089	3,845,927	3,822,949
Total Segment Operating Profit	104,305		108,131	329,042	332,133
People & Places Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	2,232,404		2,102,550	6,330,906	6,329,088
Total Segment Operating Profit	210,046		205,324	592,883	603,654
PA Consulting
Segment Reporting Information [Line Items]
One time charges					297,400
PA Consulting | Operating Segments
Segment Reporting Information [Line Items]
Revenues	277,580		255,797	864,944	354,107
Total Segment Operating Profit	$ 51,448		$ 56,791	$ 182,850	$ 84,708

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