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Earnings Per Share and Certain Related Information - Schedule of EPS to Denominator (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 29, 2019 | Mar. 30, 2018 | Mar. 29, 2019 | Mar. 30, 2018
Numerator for Basic and Diluted EPS: |  |  |  |
Net earnings (loss) attributable to Jacobs from continuing operations | $ 114,755 | $ (6,290) | $ 179,648 | $ (40,524)
Undistributed Continuing Operation Earnings (Loss), Basic | (191) | 33 | (338) | 247
Undistributed Earnings (Loss) from Continuing Operations Available to Common Shareholders, Basic | 114,564 | (6,257) | 179,310 | (40,277)
Net Earnings Attributable to Jacobs from Discontinued Operations | (57,838) | 54,877 | 1,565 | 91,274
Undistributed Discontinued Operation Earnings (Loss), Basic | 96 | (287) | (3) | (557)
Undistributed Earnings (Loss) from Discontinued Operations Available to Common Shareholders, Basic | (57,742) | 54,590 | 1,562 | 90,717
Undistributed Earnings (Loss) Available to Common Shareholders, Basic | $ 56,822 | $ 48,333 | $ 180,872 | $ 50,440
Denominator for Basic and Diluted EPS: |  |  |  |
Weighted average basic shares (in shares) | 138,566 | 142,531 | 140,509 | 133,770
Shares allocated to participating securities (in shares) | (231) | (746) | (264) | (816)
Shares used for calculating basic EPS attributable to common stock (in shares) | 138,335 | 141,785 | 140,245 | 132,954
Effect of dilutive securities: |  |  |  |
Stock compensation plans (in shares) | 981 | 0 | 1,202 | 0
Shares used for calculating diluted EPS attributable to common stock (in shares) | 139,316 | 141,785 | 141,447 | 132,954
Earnings Per Share, Basic [Abstract] |  |  |  |
Basic Net Earnings from Continuing Operations Per Share (in dollars per share) | $ 0.83 | $ (0.04) | $ 1.28 | $ (0.30)
Basic Net Earnings from Discontinued Operations Per Share (in dollars per share) | (0.42) | 0.39 | 0.01 | 0.68
Basic Earnings Per Share (in dollars per share) | 0.41 | 0.34 | 1.29 | 0.38
Earnings Per Share, Diluted [Abstract] |  |  |  |
Diluted Net Earnings from Continuing Operations Per Share (in dollars per share) | 0.82 | (0.04) | 1.27 | (0.30)
Diluted Net Earnings from Discontinued Operations Per Share (in dollars per share) | (0.41) | 0.39 | 0.01 | 0.68
Diluted Earnings Per Share (in dollars per share) | $ 0.41 | $ 0.34 | $ 1.28 | $ 0.38

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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1505-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition This element represents the weighted average total number of shares issued throughout the period including the first (beginning balance outstanding) and last (ending balance outstanding) day of the period before considering any reductions (for instance, shares held in treasury) to arrive at the weighted average number of shares outstanding. Weighted average relates to the portion of time within a reporting period that common shares have been issued and outstanding to the total time in that period. Such concept is used in determining the weighted average number of shares outstanding for purposes of calculating earnings per share (basic). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1448-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e2646-109256 + Details
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1448-109256 + Details
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