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Cover Page - shares
 9 Months Ended
Jun. 28, 2019
Jul. 26, 2019
Cover page.    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 28, 2019  
Document Transition Report false  
Entity File Number 1-7463  
Entity Registrant Name JACOBS ENGINEERING GROUP INC  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 95-4081636  
Entity Address, Address Line One 1999 Bryan Street  
Entity Address, Address Line Two Suite 1200  
Entity Address, City or Town Dallas  
Entity Address, State or Province TX  
Entity Address, Postal Zip Code 75201  
Entity Registrant Name JEC  
Entity Central Index Key 0000052988  
Current Fiscal Year End Date --09-27  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Amendment Flag false  
City Area Code 214  
Local Phone Number 583 – 8500  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Title of 12(b) Security Common Stock  
Security Exchange Name NYSE  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding (in shares)   135,498,113