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Joint Ventures and VIE's and Other Investments (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Jul. 02, 2021	Apr. 02, 2021	Jun. 26, 2020	Jul. 02, 2021	Jun. 26, 2020	Mar. 02, 2021	Oct. 02, 2020
Variable Interest Entity [Line Items]
Consolidated assets	$ 15,209,284			$ 15,209,284			$ 12,354,353
Amount by which equity method investments exceeded share of venture net assets	38,800			38,800
Income from equity method investments				(3,261)	$ 1,689
Impairment of equity method investment and other long term assets				40,138	0
PA Consulting Employees
Variable Interest Entity [Line Items]
Ownership interest of employees						35.00%
PA Consulting Group Limited
Variable Interest Entity [Line Items]
Percentage of outstanding shares of common and preferred stock acquired						65.00%
AWE Management Ltd
Variable Interest Entity [Line Items]
Equity method investments							$ 38,000
Percentage of ownership interest in joint venture							24.50%
Impairment of equity method investment and other long term assets				38,900
C3
Variable Interest Entity [Line Items]
Cost method investments							$ 2,500
Shares sold during period (in shares)		153,374
Gain on sale of stock	37,000	$ 12,500
Consolidated Joint Venture | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Consolidated assets	273,700			273,700			261,800
Consolidated liabilities	211,700			211,700			190,300
Unconsolidated Joint Venture | VIE, not primary beneficiary
Variable Interest Entity [Line Items]
Consolidated assets	50,300			50,300			64,100
Consolidated liabilities	53,600			53,600			63,000
Equity method investments	128,900			128,900			161,300
Income from equity method investments	16,600		$ 18,800	46,900	$ 54,800
Accounts receivable from unconsolidated joint ventures accounted for under the equity method	$ 15,300			$ 15,300			$ 8,300

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