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Business Combinations Business Combinations - Pro Forma Information (Details) - KeyW Holding Corporation - USD ($)	9 Months Ended
	Jun. 28, 2019	Jun. 29, 2018
Business Acquisition [Line Items]
Revenues	$ 9,562,000.0	$ 7,969,000.0
Net earnings of the Group	290,800	68,900
Net earnings (loss) attributable to Jacobs	$ 275,300	$ 63,300
Basic earnings (loss) per share	$ 1.98	$ 0.47
Diluted earnings (loss) per share	$ 1.96	$ 0.46

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