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Selected Quarterly Information - Unaudited - Schedule of Quarterly Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 27, 2024
Jun. 28, 2024
Mar. 29, 2024
Dec. 29, 2023
Sep. 29, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 30, 2022
Sep. 27, 2024
Sep. 29, 2023
Sep. 30, 2022
Oct. 01, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Revenues $ 2,960,150 $ 2,883,384 $ 2,847,179 $ 2,810,228 $ 2,834,280 $ 2,791,779 $ 2,676,652 $ 2,548,709 $ 11,500,941 $ 10,851,420 $ 9,783,074  
Operating profit 196,205 170,987 183,244 142,000 168,358 167,688 185,847 154,591 692,436 676,484 539,884  
Earnings from Continuing Operations Before Taxes 393,606 136,466 144,009 103,205 132,091 125,207 148,670 115,007 777,286 520,975 477,497  
Net Earnings of the Group from Continuing Operations 319,139 91,195 100,644 134,815 85,192 95,317 154,454 84,676 645,793 419,639 411,169  
Net earnings attributable to Jacobs from continuing operations 309,299 82,926 92,235 128,344 71,407 90,309 140,985 76,424 612,804 379,125 354,164  
Net Earnings Attributable to Jacobs from Discontinued Operations 16,138 64,009 69,877 43,265 77,972 73,929 75,527 59,224 193,289 286,652 289,875  
Net Earnings Attributable to Jacobs $ 325,437 $ 146,935 $ 162,112 $ 171,609 $ 149,379 $ 164,238 $ 216,512 $ 135,648 $ 806,093 $ 665,777 $ 644,039  
Net Earnings Per Share:                        
Basic Net Earnings from Continuing Operations Per Share (in dollars per share) $ 2.39 $ 0.66 $ 0.73 $ 1.03 $ 0.63 $ 0.71 $ 1.11 $ 0.60 $ 4.81 $ 3.06 $ 2.75  
Basic Net Earnings from Discontinued Operations Per Share (in dollars per share) 0.13 0.51 0.56 0.34 0.62 0.58 0.60 0.47 1.54 2.26 2.25  
Basic Earnings Per Share (in dollars per share) 2.52 1.17 1.29 1.37 1.25 1.29 1.71 1.07 6.35 5.32 5.01  
Diluted Net Earnings from Continuing Operations Per Share (in dollars per share) 2.38 0.66 0.73 1.03 0.63 0.71 1.11 0.60 4.79 3.05 2.74  
Diluted Net Earnings from Discontinued Operations Per Share (in dollars per share) 0.13 0.51 0.55 0.34 0.61 0.58 0.59 0.46 1.54 2.25 2.24  
Diluted Earnings Per Share (in dollars per share) $ 2.51 $ 1.17 $ 1.28 $ 1.37 $ 1.24 $ 1.29 $ 1.70 $ 1.06 $ 6.32 $ 5.30 $ 4.98  
Restructuring and other charges $ 43,400 $ 57,000 $ 37,300 $ 41,300 $ 47,900 $ 13,200     $ 179,090 $ 145,911 $ 192,477  
Recognized impairment charges         8,700   $ 10,100 $ 27,100   46,700    
Uncertain tax positions 32,886       $ 32,319   $ 40,200   32,886 32,319 82,446 $ 107,186
Discontinued Operations, Spinoff | SpinCo Business                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Net Earnings Attributable to Jacobs from Discontinued Operations                 193,877 $ 287,493 $ 289,907  
Amentum Holdings, Inc. | Discontinued Operations, Spinoff | SpinCo Business                        
Net Earnings Per Share:                        
Equity method investment retained after disposal, mark-to market gains $ 186,900               $ 186,900