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Commitments and Contingencies (Details)		1 Months Ended	3 Months Ended
	Aug. 30, 2019 USD ($)	Aug. 31, 2017 USD ($)	Dec. 27, 2019 USD ($)	Sep. 27, 2019 USD ($)	Aug. 31, 2013 case	Sep. 28, 2012
UGL Infrastructure Pty Limited
Loss Contingencies [Line Items]
Percentage of ownership interest in joint venture						50.00%
Nui Phao Mining Company
Loss Contingencies [Line Items]
Amount awarded the other party	$ 130,000,000.0
Loss Contingency Accrual, Period Increase (Decrease)			$ (50,000,000.0)
General Electric and GE Electrical International Inc | Pending Litigation | Minimum
Loss Contingencies [Line Items]
Damages sought		$ 530,000,000.0
JKC Australia LNG Pty Limited | Pending Litigation
Loss Contingencies [Line Items]
Damages sought		$ 1,700,000,000
Kingston Power Plant of the TVA, Primary Case Greg Adkisson, ET AL v. Jacobs Engineering Group Inc.
Loss Contingencies [Line Items]
Number of pending claims | case					6
Kingston Power Plant of the TVA, Secondary Case No. 3:13CV-505-TAV-HBG
Loss Contingencies [Line Items]
Number of pending claims | case					10
Line of Credit
Loss Contingencies [Line Items]
Short-term debt			271,800,000	$ 262,200,000
Surety Bond
Loss Contingencies [Line Items]
Short-term debt			$ 1,980,000,000	$ 2,000,000,000.0

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