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Business Combinations - Pro Forma Information (Details) - KeyW Holding Corporation	3 Months Ended
	Dec. 28, 2018 USD ($) $ / shares
Business Acquisition [Line Items]
Revenues	$ 3,210,100
Net earnings of the Group	69,000.0
Net earnings (loss) attributable to Jacobs	$ 64,500
Basic earnings (loss) per share | $ / shares	$ 0.45
Diluted earnings (loss) per share | $ / shares	$ 0.45

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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Amount after tax of pro forma income from continuing operations as if the business combination had been completed at the beginning of a period.

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