v3.26.1
Earnings Per Share and Certain Related Information - Schedule of Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 27, 2026
Mar. 28, 2025
Mar. 27, 2026
Mar. 28, 2025
Numerator for Basic and Diluted EPS:        
Net (Loss) Earnings Attributable to Jacobs from Continuing Operations $ (42,993) $ 11,162 $ 81,961 $ (5,966)
Redeemable Noncontrolling interests redemption value adjustment (See Note 15- PA Consulting Redeemable Noncontrolling Interests) 5,792 1,244 13,480 5,812
Net (Loss) Earnings from continuing operations allocated to common stock for EPS calculation (37,201) 12,406 95,441 (154)
Net (Loss) from discontinued operations allocated to common stock for EPS calculation (2,890) (5,550) (2,336) (6,551)
Net (Loss) Earnings allocated to common stock for EPS calculation $ (40,091) $ 6,856 $ 93,105 $ (6,705)
Denominator for Basic and Diluted EPS:        
Shares used for calculating basic EPS attributable to common stock (in shares) 117,261 122,257 117,928 123,156
Effect of dilutive securities:        
Stock compensation plans (in shares) 0 367 352 0
Shares used for calculating diluted EPS attributable to common stock (in shares) 117,261 122,624 118,280 123,156
Net Earnings Per Share:        
Basic Net (Loss) Earnings from Continuing Operations Per Share (in dollars per share) $ (0.32) $ 0.10 $ 0.81 $ 0
Basic Net (Loss) from Discontinuing Operations Per Share (in dollars per share) (0.02) (0.05) (0.02) (0.05)
Basic (Loss) Earnings Per Share (in dollars per share) (0.34) 0.06 0.79 (0.05)
Diluted (Loss) Earnings Per Share        
Diluted Net (Loss) Earnings from Continuing Operations Per Share (in dollars per share) (0.32) 0.10 0.81 0
Diluted Net (Loss) from Discontinuing Operations Per Share (in dollars per share) (0.02) (0.05) (0.02) (0.05)
Diluted (Loss) Earnings Per Share (in dollars per share) $ (0.34) $ 0.06 $ 0.79 $ (0.05)
Antidilutive securities excluded from computation of EPS (in shares)     292 472