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Earnings Per Share and Certain Related Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 02, 2021 | Oct. 01, 2021 | Oct. 02, 2020 | Sep. 27, 2019
Numerator for Basic and Diluted EPS: |  |  |  |
Net earnings attributable to Jacobs from continuing operations |  | $ 467,022 | $ 353,861 | $ 290,960
Preferred Redeemable Noncontrolling interests redemption value adjustment (See Note 14- PA Consulting Business Combination) | $ (57,300) | (57,307) | 0 | 0
Net earnings from continuing operations allocated to participating securities |  | 0 | (72) | (415)
Net earnings from continuing operations allocated to common stock for EPS calculation |  | 409,715 | 353,789 | 290,545
Net earnings attributable to Jacobs from discontinued operations |  | 10,008 | 137,984 | 557,019
Net earnings from discontinued operations allocated to participating securities |  | 0 | (28) | (795)
Net earnings from discontinued operations allocated to common stock for EPS calculation |  | 10,008 | 137,956 | 556,224
Net earnings allocated to common stock for EPS calculation |  | $ 419,723 | $ 491,745 | $ 846,769
Denominator for Basic and Diluted EPS: |  |  |  |
Weighted average basic shares (in shares) |  | 130,194 | 131,541 | 138,104
Shares allocated to participating securities (in shares) |  | 0 | (27) | (197)
Shares used for calculating basic EPS attributable to common stock (in shares) |  | 130,194 | 131,514 | 137,907
Effect of dilutive securities: |  |  |  |
Stock compensation plans (in shares) |  | 1,080 | 1,207 | 1,299
Shares used for calculating diluted EPS attributable to common stock (in shares) |  | 131,274 | 132,721 | 139,206
Earnings Per Share, Basic [Abstract] |  |  |  |
Basic Net Earnings from Continuing Operations Per Share (in dollars per share) |  | $ 3.15 | $ 2.69 | $ 2.11
Basic Net Earnings from Discontinued Operations Per Share (in dollars per share) |  | 0.08 | 1.05 | 4.03
Basic Earnings Per Share (in dollars per share) |  | 3.22 | 3.74 | 6.14
Earnings Per Share, Diluted [Abstract] |  |  |  |
Diluted Net Earnings from Continuing Operations Per Share (in dollars per share) |  | 3.12 | 2.67 | 2.09
Diluted Net Earnings from Discontinued Operations Per Share (in dollars per share) |  | 0.08 | 1.04 | 4.00
Diluted Earnings Per Share (in dollars per share) |  | 3.20 | 3.71 | $ 6.08
Share Repurchases |  |  |  |
Common stock, par value (in dollars per share) |  | 1 | 1 |
Preferred stock, par value (in dollars per share) |  | $ 1.00 | $ 1 |

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