Jacobs Engineering (J) 10-Q 6 Aug 18 2018 Q3 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	9 Months Ended
	Jun. 29, 2018	Jul. 27, 2018
Document And Entity Information [Abstract]
Entity Registrant Name	JACOBS ENGINEERING GROUP INC /DE/
Trading Symbol	jec
Entity Central Index Key	52,988
Current Fiscal Year End Date	--09-28
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 29, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding (in shares)		141,904,099

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 29, 2018	Sep. 29, 2017
Current Assets:
Cash and cash equivalents	$ 824,370	$ 774,151
Receivables	3,463,697	2,102,543
Prepaid expenses and other	187,978	119,486
Total current assets	4,476,045	2,996,180
Property, Equipment and Improvements, net	471,104	349,911
Other Noncurrent Assets:
Goodwill	5,955,048	3,009,826
Intangibles, net	680,664	332,920
Miscellaneous	968,951	692,022
Total other noncurrent assets	7,604,663	4,034,768
Assets	12,551,812	7,380,859
Current Liabilities:
Notes payable	8,964	3,071
Accounts payable	1,072,057	683,605
Accrued liabilities	1,455,266	939,687
Billings in excess of costs	559,898	299,864
Total current liabilities	3,096,185	1,926,227
Long-term Debt	2,336,473	235,000
Other Deferred Liabilities	1,066,237	732,281
Commitments and Contingencies
Capital stock:
Preferred stock, $1 par value, authorized - 1,000,000 shares; issued and outstanding - none	0	0
Common stock, $1 par value, authorized - 240,000,000 shares; issued and outstanding—141,860,952 shares and 120,385,544 shares as of June 29, 2018 and September 29, 2017, respectively	141,861	120,386
Additional paid-in capital	2,670,620	1,239,782
Retained earnings	3,880,886	3,721,698
Accumulated other comprehensive loss	(728,176)	(653,514)
Total Jacobs stockholders’ equity	5,965,191	4,428,352
Noncontrolling interests	87,726	58,999
Total Group stockholders’ equity	6,052,917	4,487,351
Total liabilities and stockholders' equity	$ 12,551,812	$ 7,380,859

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 29, 2018	Sep. 29, 2017
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, authorized (in shares)	1,000,000	1,000,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, authorized (in shares)	240,000,000	240,000,000
Common stock, issued (in shares)	141,714,841	120,385,544
Common stock, outstanding (in shares)	141,714,841	120,385,544

Consolidated Statements of Earn

Consolidated Statements of Earnings - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 29, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017
Income Statement [Abstract]
Revenues	$ 4,156,663	$ 2,514,751	$ 10,842,001	$ 7,368,922
Direct cost of contracts	(3,380,254)	(2,055,386)	(8,805,048)	(6,070,961)
Gross profit	776,409	459,365	2,036,953	1,297,961
Selling, general and administrative expenses	(563,680)	(330,890)	(1,630,294)	(1,012,685)
Operating Profit	212,729	128,475	406,659	285,276
Other Income (Expense):
Interest income	1,277	2,123	6,896	5,697
Interest expense	(23,787)	(4,054)	(50,106)	(11,327)
Miscellaneous income (expense), net	2,564	852	(6,582)	(5,879)
Total other (expense) income, net	(19,946)	(1,079)	(49,792)	(11,509)
Earnings Before Taxes	192,783	127,396	356,867	273,767
Income Tax Expense	(42,712)	(38,767)	(152,302)	(79,820)
Net Earnings of the Group	150,071	88,629	204,565	193,947
Net (Earnings) Loss Attributable to Noncontrolling Interests	151	403	(3,593)	5,639
Net Earnings Attributable to Jacobs	$ 150,222	$ 89,032	$ 200,972	$ 199,586
Net Earnings Per Share:
Basic (in dollars per share)	$ 1.05	$ 0.74	$ 1.47	$ 1.65
Diluted (in dollars per share)	$ 1.05	$ 0.74	$ 1.46	$ 1.64

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 29, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net Earnings of the Group	$ 150,071	$ 88,629	$ 204,565	$ 193,947
Other Comprehensive Income (Loss):
Foreign currency translation adjustment	(114,044)	66,763	(86,350)	(179,320)
Gain (loss) on cash flow hedges	(107)	(4,386)	954	362
Change in pension liabilities	2,814	(13,991)	11,680	8,304
Other comprehensive income (loss) before taxes	(111,337)	48,386	(73,716)	(170,654)
Income Tax Expense:
Cash flow hedges	786	1,016	637	(90)
Change in pension liabilities	(561)	2,220	(1,583)	(2,049)
Income Tax (Expense) Benefit:	225	3,236	(946)	(2,139)
Net other comprehensive income (loss)	(111,112)	51,622	(74,662)	(172,793)
Net Comprehensive Income (Loss) of the Group	38,959	140,251	129,903	21,154
Net (Earnings) Loss Attributable to Noncontrolling Interests	151	403	(3,593)	5,639
Net Comprehensive Income (Loss) Attributable to Jacobs	$ 39,110	$ 140,654	$ 126,310	$ 26,793

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jun. 29, 2018	Jun. 30, 2017
Cash Flows from Operating Activities:
Net earnings attributable to the Group	$ 204,565	$ 193,947
Depreciation and amortization:
Property, equipment and improvements	88,715	52,718
Intangible assets	58,495	34,891
(Gain) loss on sales of business	(444)	822
Stock based compensation	61,821	32,128
Tax deficiency from stock based compensation	0	(2,742)
Equity in earnings of operating ventures, net	(8,387)	(2,378)
(Gain) loss on disposals of assets, net	10,055	1,150
Loss (gain) on pension plan changes	3,819	(9,955)
Deferred income taxes	(7,374)	(20,152)
Changes in assets and liabilities, excluding the effects of businesses acquired:
Receivables	(316,386)	44,163
Prepaid expenses and other current assets	5,620	(2,095)
Accounts payable	138,713	31,682
Accrued liabilities	(93,368)	(53,719)
Billings in excess of costs	34,695	70,974
Income taxes payable	101,451	23,161
Other deferred liabilities	(21,007)	(18,782)
Other, net	7,967	4,774
Net Cash Provided by (Used in) Operating Activities	268,950	380,587
Cash Flows Used for Investing Activities:
Additions to property and equipment	(63,408)	(73,552)
Disposals of property and equipment	428	1,274
Distributions of capital from (contributions to) equity investees	7,614	0
Acquisitions of businesses, net of cash acquired	(1,488,546)	(24,782)
Proceeds (payments) related to sales of businesses	3,403	(2,036)
Net cash used for investing activities	(1,540,509)	(99,096)
Cash Flows Provided by Financing Activities:
Proceeds from long-term borrowings	5,371,355	1,065,289
Repayments of long-term borrowings	(3,970,130)	(1,169,763)
Proceeds from short-term borrowings	1,861	1,348
Repayments of short-term borrowings	(699)	(702)
Proceeds from issuances of common stock	33,588	53,290
Common stock repurchases	(2,982)	(97,180)
Excess tax benefits from stock based compensation	0	2,742
Taxes paid on vested restricted stock	(27,975)	0
Cash dividends, including to noncontrolling interests	(65,232)	(40,711)
Net cash provided by (used for) financing activities	1,339,786	(185,687)
Effect of Exchange Rate Changes	(18,008)	6,776
Net Increase in Cash and Cash Equivalents	50,219	102,580
Cash and Cash Equivalents at the Beginning of the Period	774,151	655,716
Cash and Cash Equivalents at the End of the Period	$ 824,370	$ 758,296

Basis of Presentation

Basis of Presentation	9 Months Ended
	Jun. 29, 2018
Basis Of Presentation [Abstract]
Basis of Presentation	Basis of Presentation Unless the context otherwise requires: • References herein to “Jacobs” are to Jacobs Engineering Group Inc. and its predecessors; • References herein to the “Company”, “we”, “us” or “our” are to Jacobs Engineering Group Inc. and its consolidated subsidiaries; and • References herein to the “Group” are to the combined economic interests and activities of the Company and the persons and entities holding noncontrolling interests in our consolidated subsidiaries. The accompanying consolidated financial statements and financial information included herein have been prepared pursuant to the interim period reporting requirements of Form 10-Q. Consequently, certain information and note disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) have been condensed or omitted. Readers of this Quarterly Report on Form 10-Q should also read our consolidated financial statements and the notes thereto included in our Annual Report on Form 10-K for the fiscal year ended September 29, 2017 (“2017 Form 10-K”). In the opinion of management, the accompanying unaudited consolidated financial statements contain all adjustments (consisting of normal recurring adjustments) necessary for a fair presentation of our consolidated financial statements at June 29, 2018 , and for the three and nine month periods ended June 29, 2018 . Our interim results of operations are not necessarily indicative of the results to be expected for the full fiscal year. Please refer to Note 17 Definitions of Notes to Consolidated Financial Statements included in our 2017 Form 10-K for the definitions of certain terms used herein.

Use of Estimates and Assumption

Use of Estimates and Assumptions	9 Months Ended
	Jun. 29, 2018
Use Of Estimates And Assumptions [Abstract]
Use of Estimates and Assumptions	Use of Estimates and Assumptions The preparation of financial statements in conformity with U.S. GAAP requires us to employ estimates and make assumptions that affect the reported amounts of certain assets and liabilities, the revenues and expenses reported for the periods covered by the accompanying consolidated financial statements, and certain amounts disclosed in these Notes to the Consolidated Financial Statements. Although such estimates and assumptions are based on management’s most recent assessment of the underlying facts and circumstances utilizing the most current information available and past experience, actual results could differ significantly from those estimates and assumptions. Our estimates, judgments, and assumptions are evaluated periodically and adjusted accordingly. Please refer to Note 2 Significant Accounting Policies of Notes to Consolidated Financial Statements included in our 2017 Form 10-K for a discussion of the significant estimates and assumptions affecting our consolidated financial statements.

Fair Value and Fair Value Measu

Fair Value and Fair Value Measurements	9 Months Ended
	Jun. 29, 2018
Fair Value Disclosures [Abstract]
Fair Value and Fair Value Measurements	Fair Value and Fair Value Measurements Certain amounts included in the accompanying consolidated financial statements are presented at “fair value.” Fair value is defined as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants as of the date fair value is determined (the “measurement date”). When determining fair value, we consider the principal or most advantageous market in which we would transact, and we consider only those assumptions we believe a typical market participant would consider when pricing an asset or liability. In measuring fair value, we use the following inputs in the order of priority indicated: Level 1 - Quoted prices in active markets for identical assets or liabilities. Level 2 - Observable inputs other than quoted prices in active markets included in Level 1, such as (i) quoted prices for similar assets or liabilities; (ii) quoted prices in markets that have insufficient volume or infrequent transactions (e.g., less active markets); and (iii) model-driven valuations in which all significant inputs are observable or can be derived principally from, or corroborated with, observable market data for substantially the full term of the asset or liability. Level 3 - Unobservable inputs to the valuation methodology that are significant to the fair value measurement. Please refer to Note 2 Significant Accounting Policies of Notes to Consolidated Financial Statements included in our 2017 Form 10-K for a more complete discussion of the various items within the consolidated financial statements measured at fair value and the methods used to determine fair value. The net carrying amounts of cash and cash equivalents, trade receivables and payables, and notes payable approximate fair value due to the short-term nature of these instruments. See Note 11 Long Term Debt for a discussion of the fair value of long-term debt.

New Accounting Pronouncements

New Accounting Pronouncements	9 Months Ended
	Jun. 29, 2018
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Pronouncements	New Accounting Pronouncements From time to time, the Financial Accounting Standards Board (“FASB”) issues accounting standards updates (each being an “ASU”) to its Accounting Standards Codification (“ASC”), which constitutes the primary source of U.S. GAAP. The Company regularly monitors ASUs as they are issued and considers their applicability to its business. All ASUs applicable to the Company are adopted by their effective dates and in the manner prescribed by the FASB. Revenue Recognition In May 2014, the FASB issued ASU No. 2014-09 Revenue from Contracts with Customers. The new guidance provided by ASU 2014-09 is intended to remove inconsistencies and perceived weaknesses in the existing revenue requirements, provide a more robust framework for addressing revenue issues, improve comparability, provide more useful information and simplify the preparation of financial statements. The effective date for ASU 2014-09 is for annual reporting periods beginning after December 15, 2017 and interim periods therein. The Company’s adoption activities are being performed over three phases: (i) assessment, (ii) design, and (iii) implementation. Our assessment and design phases are complete. We have established a cross-functional team to implement ASU 2014-09. As part of the implementation process, the Company has identified the following potentially significant differences to date: Performance Obligations Under current U.S. GAAP, the Company typically segments contracts that contain multiple services by service type, such as engineering, procurement and construction services, for purposes of revenue recognition. Under ASU 2014-09, multiple-service contracts where the Company is responsible for providing a single deliverable (e.g., a constructed asset) will be treated as a single performance obligation for purposes of revenue recognition and thus no longer will be segmented. Typically, this will occur when the company is contracted to perform both engineering and construction on a project. In these circumstances, the timing and pattern of revenue recognition will change. The remainder of the Company's contracts will continue to be treated as a single unit of account because they either contain only one service or because the Company has determined that the component services in the contract are distinct. Contract Modifications In many instances, the Company enters into separate contracts for related services (e.g., engineering and construction) but is held responsible for providing a single deliverable (“Phased Projects”). Under ASU 2014-09, the separate contracts may be required to be combined and treated as a single contract with one performance obligation. This modification or combination of contracts may result in a cumulative catchup adjustment, which will have an immediate impact on the Company’s results of operations in the period the contract combination or modification occurs. In addition, it will change the timing and pattern of revenue recognition after the period the contracts have been combined or modified. The Company analyzed its current Phased Projects and concluded that a number of these arrangements would be combined under ASU 2014-09. Based on the two noted changes above, the Company has identified selected changes to our systems, processes and internal controls and designed updates for each to meet the standard's revised reporting and disclosure requirements. The Company has also assessed the impact of ASU 2014-09 to the recently acquired CH2M business. We will align CH2M's accounting policies, processes and controls with the policies, processes and controls being implemented across the Company. The Company will adopt the new standard using the Modified Retrospective application. This standard could have a significant impact on the Company’s Consolidated Financial Statements and an administrative impact on its operations. The impact will depend on the magnitude of the items discussed above. While the Company will continue to evaluate the impact through the implementation phase, we expect a downward adjustment to retained earnings in the period of adoption due to revenue timing for certain engineering and construction contracts shifting when they are accounted for as a single performance obligation. Lease Accounting In February 2016, the FASB issued ASU 2016-02 Leases . ASU 2016-02 requires lessees to recognize assets and liabilities for most leases. ASU 2016-02 is effective for public entity financial statements for annual periods beginning after December 15, 2018, and interim periods within those annual periods. Early adoption is permitted, including adoption in an interim period. The new guidance currently requires a modified retrospective transition approach for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. In January 2018, the FASB released an exposure draft that, if issued in its current form, would provide us with the option to adopt the provisions of the new guidance prospectively, without adjusting the comparative periods presented. The Company is evaluating the impact of the new guidance on its consolidated financial statements. This standard could have a significant administrative impact on its operations, and the Company will further assess the impact through its implementation program. Other Pronouncements In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. ASU 2017-12 provides financial reporting improvements related to hedging relationships to better portray the economic results of an entity’s risk management activities in its financial statements. Additionally, ASU No. 2017-12 makes certain targeted improvements to simplify the application of the hedge accounting guidance. The revised guidance becomes effective for fiscal years beginning after December 15, 2018 with early adoption permitted. The Company is evaluating the impact of the new guidance on its consolidated financial statements. It is not expected that the updated guidance will have a significant impact on the Company’s consolidated financial statements. ASU 2017-04, Simplifying the Test for Goodwill Impairment, is effective for fiscal years beginning after December 15, 2019 with early adoption permitted. ASU 2017-04 removes the second step of the goodwill impairment test, which requires a hypothetical purchase price allocation. An entity will now recognize a goodwill impairment charge for the amount by which a reporting unit's carrying value exceeds its fair value, not to exceed the amount of goodwill allocated to the reporting unit. Management does not expect the adoption of ASU 2017-04 to have any impact on the Company's financial position, results of operations or cash flows. In March 2017, the FASB issued ASU No. 2017-07, Compensation- Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost . This new standard intends to improve the presentation of net periodic pension cost and net periodic postretirement benefit cost. The new standard requires the service cost component of net periodic cost be reported in the same line item(s) as other employee compensation costs and all other components of the net periodic cost be reported in the consolidated statements of earnings and comprehensive income below operating income. ASU 2017-7 is effective for fiscal years beginning after December 15, 2017 for public companies and early adoption is permitted. Management is currently evaluating the impact that the adoption of ASU 2017-07 will have on the Company's financial position, results of operations and cash flows. In February 2018, the FASB issued ASU 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income , which allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act. ASU 2018-02 is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted. Management is currently evaluating the impact that the adoption of ASU 2018-02 will have on the Company's financial position, results of operations and cash flows.

Business Combinations

Business Combinations	9 Months Ended
	Jun. 29, 2018
Business Combinations [Abstract]
Business Combinations	Business Combinations On December 15, 2017, the Company completed the acquisition of CH2M HILL Companies, Ltd. (CH2M), an international provider of engineering, construction, and technical services, by acquiring 100% of the outstanding shares of CH2M common stock and preferred stock. The purpose of the acquisition was to further diversify the Company’s presence in the water, nuclear and environmental remediation sectors and to further the Company’s profitable growth strategy. The Company paid total consideration of approximately $1.8 billion in cash (excluding $315.2 million of cash acquired) and issued approximately $1.4 billion of Jacobs’ common stock, or 20.7 million shares, to the former stockholders and certain equity award holders of CH2M. In connection with the acquisition, the Company also assumed CH2M’s revolving credit facility and second lien notes, including a $20.0 million prepayment penalty, which totaled approximately $700 million of long-term debt. Immediately following the effective time of the acquisition, the Company repaid CH2M’s revolving credit facility and second lien notes including the related prepayment penalty. The following summarizes the estimated fair values of CH2M assets acquired and liabilities assumed as of the acquisition date (in millions): Assets Cash and cash equivalents $ 315.2 Receivables 1,156.0 Prepaid expenses and other 72.7 Property, equipment and improvements, net 175.1 Goodwill 2,967.1 Identifiable intangible assets: Customer relationships, contracts and backlog 412.3 Lease intangible assets 4.4 Total identifiable intangible assets 416.7 Miscellaneous 353.2 Total Assets $ 5,456.0 Liabilities Notes payable $ 2.2 Accounts payable 309.6 Accrued liabilities 719.3 Billings in excess of costs 265.8 Identifiable intangible liabilities: Lease intangible liabilities 9.6 Long-term debt 705.9 Other deferred liabilities 381.6 Total Liabilities 2,394.0 Noncontrolling interests (37.3 ) Net assets acquired $ 3,024.7 The purchase price allocation is based upon preliminary information and is subject to change when additional information is obtained. Goodwill recognized from the acquisition largely results from a substantial assembled workforce, which does not qualify for separate recognition, as well as expected future synergies from combining operations. None of the goodwill recognized is expected to be deductible for tax purposes. The Company has not completed its final assessment of the fair values of purchased receivables, intangible assets and liabilities, property, equipment and improvements, tax balances, contingent liabilities, long-term leases or acquired contracts. The final purchase price allocation will result in adjustments to certain assets and liabilities, including the residual amount allocated to goodwill. See Note 18, Commitments and Contingencies , relating to CH2M contingencies. Since the initial preliminary estimates reported in the first quarter of 2018, the Company has updated certain provisional amounts reflected in the preliminary purchase price allocation, as summarized in the estimated fair values of CH2M assets acquired and liabilities assumed above. Specifically, the carrying amount of the intangible assets discussed above were decreased by $186.2 million as a result of valuation adjustments. Additionally, the carrying amount of property, equipment and improvements, net decreased by $50.5 million to reflect its estimated fair value, receivables decreased $45.9 million and accrued liabilities increased $60.3 million , respectively, primarily related to contracts. Further, miscellaneous long-term assets increased $75.8 million largely due to the deferred tax impact of these valuation adjustments. As a result of these adjustments to the initial preliminary purchase price allocation, goodwill has increased $268.3 million . Measurement period adjustments are recognized in the reporting period in which the adjustments are determined and calculated as if the accounting had been completed at the acquisition date. Customer relationships, contracts and backlog intangibles represent the fair value of existing contracts, the underlying customer relationships and backlog of consolidated subsidiaries and have lives ranging from 9 to 11 years (weighted average life of approximately 10 years ). Other intangible assets and liabilities primarily consist of the fair value of office leases and have a weighted average life of approximately 10 years . Estimated fair value measurements relating to the CH2M acquisition are made primarily using Level 3 inputs including discounted cash flow techniques. Fair value is estimated using inputs primarily from the income approach, which include the use of both the multiple period excess earnings method and the relief from royalties method. The significant assumptions used in estimating fair value include (i) the estimated life the asset will contribute to cash flows, such as attrition rate of customers or remaining contractual terms, (ii) profitability and (iii) the estimated discount rate that reflect the level of risk associated with receiving future cash flows. The estimated fair value of land has been determined using the market approach, which arrives at an indication of value by comparing the site being valued to sites that have been recently acquired in arm’s-length transactions. Buildings and land improvements are valued using the cost approach using a direct cost model built on estimates of replacement cost. Other personal property assets such as furniture, fixtures and equipment are valued using the cost approach which is based on replacement or reproduction costs of the asset less depreciation. Other deferred liabilities were comprised primarily of pensions and other long-term employee related liabilities totaling approximately $291.0 million . From the acquisition date of December 15, 2017 through the end of the third fiscal quarter of 2018, CH2M contributed approximately $2.5 billion in revenue and $87.9 million in pretax income included in the accompanying consolidated statement of earnings. Included in these results were approximately $93.3 million in pre-tax restructuring and transaction costs. Transaction costs associated with the CH2M acquisition in the accompanying consolidated statements of earnings for the three and nine months ended June 29, 2018 are comprised of the following (in millions): Three Months Ended June 29, 2018 Nine Months Ended June 29, 2018 Personnel costs $ 4.3 $ 50.2 Professional services and other expenses 1.1 27.9 Total $ 5.4 $ 78.1 Personnel costs above include change of control payments and related severance costs. The following presents summarized unaudited pro forma operating results of Jacobs assuming that the Company had acquired CH2M at October 1, 2016. These pro forma operating results are presented for illustrative purposes only and are not indicative of the operating results that would have been achieved had the related events occurred (in millions): Nine Months Ended June 29, June 30, Revenues $ 11,869.8 $ 10,709.9 Net earnings $ 226.1 $ 130.8 Net earnings (loss) attributable to Jacobs $ 222.1 $ 112.7 Net earnings (loss) attributable to Jacobs per share: Basic earnings (loss) per share $ 1.56 $ 0.80 Diluted earnings (loss) per share $ 1.55 $ 0.80 Included in the unaudited pro forma operating results are charges relating to transaction expenses, severance expense and other items that are removed from the nine months ended June 29, 2018 and are reflected in the nine months ended June 30, 2017 due to the assumed timing of the transaction. Also, income tax expense (benefit) for the nine month pro forma periods ended June 29, 2018 and June 30, 2017 was $180.4 million and ($14.9) million , respectively.

Goodwill and Intangibles

Goodwill and Intangibles	9 Months Ended
	Jun. 29, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangibles	Goodwill and Intangibles As a result of the segment realignment in the prior quarter (See Note 7, Segment Information ), the historical carrying value of goodwill was allocated to the three remaining reportable segments to present balances on a comparable basis. The carrying value of goodwill appearing in the accompanying Consolidated Balance Sheets at June 29, 2018 and September 29, 2017 was as follows (in millions): Aerospace, Technology, Environmental and Nuclear Buildings, Infrastructure and Advanced Energy, Total Balance September 29, 2017 $ 1,038.2 $ 1,048.8 $ 922.8 $ 3,009.8 Acquired 1,090.9 1,492.1 384.1 2,967.1 Post-Acquisition Adjustments 2.9 (0.1 ) — 2.8 Foreign Exchange Impact (8.2 ) (9.5 ) (7.0 ) (24.7 ) Balance June 29, 2018 $ 2,123.8 $ 2,531.3 $ 1,299.9 $ 5,955.0 During the preparation of our Quarterly Report on Form 10-Q for the first fiscal quarter of 2017, the Company determined that its prior financial statements contained immaterial misstatements related to incorrect translation of the Company’s non-U.S. goodwill balances from local currency to the U.S. Dollar reporting currency. It was determined that the Company had incorrectly used historical translation rates for the U.S. Dollar in place at the time of the Company’s recording of its foreign goodwill balances rather than using current translation rates at each balance sheet date in accordance with U.S. GAAP. The error dated back to the time of our initial reporting of non-US goodwill balances in the late 1990s and affected our historical quarterly and annual reporting periods through the first fiscal quarter of 2017. Goodwill and accumulated other comprehensive income in the Company’s September 30, 2016 consolidated balance sheet (which have not been adjusted) were each overstated by $209.9 million and was corrected in the first fiscal quarter of 2017 foreign currency translation adjustment. Consequently, the correction was a direct component of the overall translation adjustment amount of $287.5 million that was reported for the three months ended December 30, 2016. These adjustments had no impact on the Company’s Consolidated Statements of Earnings or Cash Flows. The following table provides certain information related to the Company’s acquired intangibles in the accompanying Consolidated Balance Sheets at June 29, 2018 and September 29, 2017 (in thousands): Customer Relationships, Contracts and Backlog Developed Technology Trade Names Patents Lease Other Total Balances September 29, 2017 $ 301,468 $ 14,462 $ 6,699 $ 10,180 $ — $ 111 $ 332,920 Acquisitions 412,300 237 — — 4,415 — 416,952 Post-Acquisition Adjustments 200 (1,921 ) (1,700 ) — — — (3,421 ) Amortization (54,288 ) (1,150 ) (2,292 ) (310 ) (417 ) (38 ) (58,495 ) Foreign currency translation (6,608 ) — (87 ) (597 ) — (7,292 ) Balances June 29, 2018 $ 653,072 $ 11,628 $ 2,620 $ 9,273 $ 3,998 $ 73 $ 680,664 In addition, we acquired $9.6 million in lease intangible liabilities in connection with the CH2M acquisition, of which $9.0 million remain unamortized at June 29, 2018 . The following table presents estimated amortization expense of intangible assets for the remainder of fiscal 2018 and for the succeeding years. The amounts below include preliminary amortization estimates for the CH2M opening balance sheet fair values of the customer relationships, contracts and backlog intangible assets that are still preliminary and are subject to change. Fiscal Year (in millions) 2018 (three months remaining) $ 20.8 2019 86.4 2020 83.4 2021 79.8 2022 78.6 Thereafter 322.7 Total $ 671.7

Segment Information

Segment Information	9 Months Ended
	Jun. 29, 2018
Segment Reporting [Abstract]
Segment Information	Segment Information During the second quarter of fiscal 2018, we reorganized our operating and reporting structure around three lines of business (“LOBs”), which also serve as the Company’s operating segments. This reorganization occurred in conjunction with the integration of CH2M into the Company's legacy businesses, and is intended to better serve our global clients, leverage our workforce, help streamline operations, and provide enhanced growth opportunities. The three global LOBs are as follows: Aerospace, Technology, Environmental and Nuclear ("ATEN"); Buildings, Infrastructure and Advanced Facilities ("BIAF"); and Energy, Chemicals and Resources ("ECR"). Previously, the Company operated its business around four operating segments: Petroleum & Chemicals, Buildings & Infrastructure, Aerospace & Technology, and Industrial. Beginning in the second quarter of fiscal 2018, management no longer views or manages our Industrial line of business as a separate, distinct operating segment. Therefore, the elements of our former Industrial business are now presented within each of the three current operating segments as appropriate. The Company’s LOB leadership and internal reporting structures report to the Chief Executive Officer, who is also the Chief Operating Decision Maker (“CODM”), and enable the CODM to evaluate the performance of each of these segments and make appropriate resource allocations among each of the segments. For purposes of the Company’s goodwill impairment testing, it has been determined that the Company’s operating segments are also its reporting units based on management’s conclusion that the components comprising each of its operating segments share similar economic characteristics and meet the aggregation criteria for reporting units in accordance with ASC 350, Intangibles-Goodwill and Other . Under the new organization, each LOB has a president that reports directly to the CODM. The sales function is managed on an LOB basis, and accordingly, the associated cost is embedded in the new segments and reported to the respective LOB presidents. In addition, a portion of the costs of other support functions (e.g., finance, legal, human resources, and information technology) is allocated to each LOB using methodologies which, we believe, effectively attribute the cost of these support functions to the revenue generating activities of the Company on a rational basis. The cost of the Company’s cash incentive plan, the Management Incentive Plan (“MIP”) and the expense associated with the Jacobs Engineering Group Inc. 1999 Stock Incentive Plan (“1999 SIP”) have likewise been charged to the LOBs except for those amounts determined to relate to the business as a whole (which amounts remain in other corporate expenses). Financial information for each LOB is reviewed by the CODM to assess performance and make decisions regarding the allocation of resources. The Company generally does not track assets by LOB, nor does it provide such information to the CODM. The CODM evaluates the operating performance of our LOBs using segment operating profit, which is defined as margin less “corporate charges” (e.g., the allocated amounts described above). The Company incurs certain Selling, General and Administrative costs (“SG&A”) that relate to its business as a whole which are not allocated to the LOBs. On December 15, 2017, the Company completed the acquisition of CH2M. For purposes of the Company’s third quarter fiscal 2018 segment reporting, the operating financial information of CH2M has been categorized within the Company’s new LOB business structure, with its sales and operating profit results for the time period during which CH2M has been under the ownership of the Company being allocated to the Company’s ATEN, BIAF and ECR lines of business under a transitional business organization structure. The Company has not completed its final assessment of the CH2M purchase price allocation, including the fair value estimates of assets acquired and liabilities assumed. The following tables present total revenues and segment operating profit for each reportable segment (in thousands) and includes a reconciliation of segment operating profit to total U.S. GAAP operating profit by including certain corporate-level expenses and expenses relating to the Restructuring and other charges and CH2M transaction and integration costs (in thousands). Prior period information has been recast to reflect the current period presentation. For the Three Months Ended For the Nine Months Ended June 29, 2018 June 30, 2017 June 29, 2018 June 30, 2017 Revenues from External Customers: Aerospace, Technology, Environmental and Nuclear $ 1,221,306 $ 610,643 $ 3,072,900 $ 1,815,871 Buildings, Infrastructure and Advanced Facilities 1,707,072 987,159 4,497,249 2,823,882 Energy, Chemicals and Resources 1,228,285 916,949 3,271,852 2,729,169 Total $ 4,156,663 $ 2,514,751 $ 10,842,001 $ 7,368,922 For the Three Months Ended For the Nine Months Ended June 29, 2018 June 30, 2017 June 29, 2018 June 30, 2017 Segment Operating Profit: Aerospace, Technology, Environmental and Nuclear (1) $ 89,334 $ 49,383 $ 217,003 $ 143,781 Buildings, Infrastructure and Advanced Facilities (2) 145,901 72,991 347,887 191,680 Energy, Chemicals and Resources 61,969 45,792 164,759 120,106 Total Segment Operating Profit 297,204 168,166 729,649 455,567 Other Corporate Expenses (3) (33,131 ) (28,991 ) (110,919 ) (55,625 ) Restructuring and Other Charges (46,922 ) (10,700 ) (135,156 ) (114,666 ) CH2M Transaction Costs (4,422 ) — (76,915 ) — Total U.S. GAAP Operating Profit 212,729 128,475 406,659 285,276 Total Other (Expense) Income, net (4) (19,946 ) (1,079 ) (49,792 ) (11,509 ) Earnings Before Taxes $ 192,783 $ 127,396 $ 356,867 $ 273,767 (1) Includes $15.0 million in charges during the nine month period ended June 29, 2018 associated with a legal matter. (2) Excludes $22.6 million in restructuring and other charges for the nine months ended June 30, 2017. See Note 10, Restructuring and Other Charges . (3) Includes $15.0 million in other corporate charges associated with a certain project for the three months ended June 29, 2018. (4) Includes amortization of deferred financing fees related to the CH2M acquisition of $0.5 million and $1.2 million for the three and nine months ended June 29, 2018 , respectively. Also includes $1.2 million of restructuring and other expenses for the nine months ended June 30, 2017. Included in “other corporate expenses” in the above table are costs and expenses which relate to general corporate activities as well as corporate-managed benefit and insurance programs. Such costs and expenses include: (i) those elements of SG&A expenses relating to the business as a whole; (ii) those elements of the Management Incentive Plan and the 1999 SIP relating to corporate personnel whose other compensation costs are not allocated to the LOBs; (iii) the amortization of intangible assets acquired as part of purchased business combinations; (iv) the quarterly variances between the Company’s actual costs of certain of its self-insured integrated risk and employee benefit programs and amounts charged to the LOBs; and (v) certain adjustments relating to costs associated with the Company’s international defined benefit pension plans. In addition, other corporate expenses may also include from time to time certain adjustments to contract margins (both positive and negative) associated with projects where it has been determined, in the opinion of management, that such adjustments are not indicative of the performance of the related LOB. We provide a broad range of technical, professional, and construction services including engineering, design, and architectural services; construction and construction management services; operations and maintenance services; and process, scientific, and systems consulting services. We provide our services through offices and subsidiaries located primarily in North America, South America, Europe, the Middle East, India, Australia, Africa, and Asia. We provide our services under cost-reimbursable and fixed-price contracts. The following tables present total services revenues for each reportable segment for the three and nine months ended June 29, 2018 and June 30, 2017 (in thousands). Certain reclassifications have been made in connection with the segment realignment which took place in the second quarter of fiscal 2018. For the Three Months Ended For the Nine Months Ended June 29, 2018 June 29, 2018 Aerospace, Technology, Environmental and Nuclear Buildings, Infrastructure and Advanced Facilities Energy, Chemicals Total Aerospace, Technology, Buildings, Infrastructure and Advanced Facilities Energy, Chemicals Total Technical Professional Services Revenues Project Services $ 592,290 $ 1,265,193 $ 275,884 $ 2,133,367 $ 1,415,382 $ 3,412,655 $ 908,397 $ 5,736,434 Process, Scientific, and Systems Consulting 316,175 2,982 6,971 326,128 823,404 7,453 18,488 849,345 Total Technical Professional Services Revenues 908,465 1,268,175 282,855 2,459,495 2,238,786 3,420,108 926,885 6,585,779 Field Services Revenues Construction 175,154 433,270 680,553 1,288,977 478,893 1,065,879 1,683,296 3,228,068 Operations and Maintenance ("O&M") 137,687 5,627 264,877 408,191 355,221 11,262 661,671 1,028,154 Total Field Services Revenues 312,841 438,897 945,430 1,697,168 834,114 1,077,141 2,344,967 4,256,222 $ 1,221,306 $ 1,707,072 $ 1,228,285 $ 4,156,663 $ 3,072,900 $ 4,497,249 $ 3,271,852 $ 10,842,001 For the Three Months Ended For the Nine Months Ended June 30, 2017 June 30, 2017 Aerospace, Technology, Environmental and Nuclear Buildings, Infrastructure and Advanced Facilities Energy, Chemicals Total Aerospace, Technology, Buildings, Infrastructure and Advanced Facilities Energy, Chemicals Total Technical Professional Services Revenues Project Services $ 232,288 $ 704,940 $ 267,300 $ 1,204,528 $ 619,149 $ 1,992,889 $ 812,008 $ 3,424,046 Process, Scientific, and Systems Consulting 190,955 2,537 5,463 198,955 575,728 8,868 15,554 600,150 Total Technical Professional Services Revenues 423,243 707,477 272,763 1,403,483 1,194,877 2,001,757 827,562 4,024,196 Field Services Revenues Construction 82,295 276,013 483,911 842,219 254,505 811,410 1,445,720 2,511,635 Operations and Maintenance ("O&M") 105,105 3,669 160,275 269,049 366,489 10,715 455,887 833,091 Total Field Services Revenues 187,400 279,682 644,186 1,111,268 620,994 822,125 1,901,607 3,344,726 $ 610,643 $ 987,159 $ 916,949 $ 2,514,751 $ 1,815,871 $ 2,823,882 $ 2,729,169 $ 7,368,922

Receivables

Receivables	9 Months Ended
	Jun. 29, 2018
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Receivables	Receivables The following table presents the components of receivables appearing in the accompanying Consolidated Balance Sheets at June 29, 2018 and September 29, 2017 , as well as certain other related information (in thousands): June 29, 2018 September 29, 2017 Components of receivables: Amounts billed, net $ 1,595,644 $ 949,060 Unbilled receivables and other 1,844,918 1,118,144 Retentions receivable 23,135 35,339 Total receivables, net $ 3,463,697 $ 2,102,543 Other information about receivables: Amounts due from the United States federal $ 454,107 $ 226,236 Claims receivable $ 4,600 $ 4,600 Amounts billed, net consist of amounts invoiced to clients in accordance with the terms of our client contracts and are shown net of an allowance for doubtful accounts. We anticipate that substantially all of such billed amounts will be collected over the next twelve months. Unbilled receivables and other and Retentions receivable generally represent reimbursable costs, in some cases profit and amounts earned and reimbursable under contracts in progress, or in some cases completed, as of the respective balance sheet dates. Such amounts become billable according to the contract terms, which usually provide that such amounts become billable upon the passage of time, achievement of certain milestones, or completion of the project. We anticipate that substantially all of such unbilled amounts will be billed and collected over the next twelve months. Claims receivable are included in receivables in the accompanying Consolidated Balance Sheets and represent certain costs incurred on contracts to the extent it is probable that such claims will result in additional contract revenue and the amount of such additional revenue can be reliably estimated.

Property, Equipment and Improve

Property, Equipment and Improvements, Net	9 Months Ended
	Jun. 29, 2018
Property, Plant and Equipment [Abstract]
Property, Equipment and Improvements, Net	Property, Equipment and Improvements, Net Property, Equipment and Improvements, Net in the accompanying Consolidated Balance Sheets at June 29, 2018 and September 29, 2017 consist of the following (in thousands): June 29, 2018 September 29, 2017 Land $ 20,010 $ 17,197 Buildings 129,769 93,313 Equipment 715,476 627,609 Leasehold improvements 264,179 220,295 Construction in progress 24,887 21,300 1,154,321 979,714 Accumulated depreciation and amortization (683,217 ) (629,803 ) $ 471,104 $ 349,911

Restructuring and Other Charges

Restructuring and Other Charges	9 Months Ended
	Jun. 29, 2018
Restructuring and Related Activities [Abstract]
Restructuring and Other Charges	Restructuring and Other Charges During the fourth fiscal quarter of 2017, the Company implemented certain restructuring and pre-integration plans associated with the pending acquisition of CH2M, which closed on December 15, 2017. The restructuring activities and related costs under these plans were comprised mainly of severance and lease abandonment programs, while the pre-integration activities and costs were mainly related to the engagement of consulting services and internal personnel and other related costs dedicated to the Company’s acquisition integration management efforts. Following the closing of the CH2M acquisition, these activities have continued into the first three quarters of 2018 and include restructuring activities amounting to appro ximately $33.9 million and $94.6 million in pre-tax charges during the three and nine month periods ended June 29, 2018 , respectively. The integration activities for the same periods amounted to approximately $12.6 million and $40.6 million in pre-tax charges for the three and nine months ended June 29, 2018 , respectively. These activities are expected to continue through fiscal 2019 and are not expected to involve the exit of any service types or client end-markets. During the second fiscal quarter of 2017, the Company entered into strategic business restructuring activities associated with realignment of its Europe, United Kingdom ("U.K.") and Middle East regional operations in our BIAF segment. Pre-tax net charges of $22.6 million were recorded associated mainly with net realizable value write-offs on contract accounts receivable of $16.5 million , with additional charges recorded for statutory redundancy and severance costs of $1.4 million and other liabilities of $4.7 million which are both expected to be paid or settled within the next twelve months. During the second fiscal quarter of 2015, the Company began implementing a series of initiatives intended to improve operational efficiency, reduce costs, and better position itself to drive growth of the business in the future. We refer to these initiatives, in the aggregate, as the “2015 Restructuring”. These activities evolved and developed over time as management identified and evaluated opportunities for changes in the Company’s operations (and related areas of potential cost savings), as economic conditions changed and as the realignment of the Company’s operations into its four global LOBs was implemented. Actions related to the 2015 Restructuring included involuntary terminations, the abandonment of certain leased offices, combining operational organizations, and the colocation of employees into other existing offices. These activities did not involve the exit of any service types or client end-markets. The 2015 Restructuring was completed in fiscal 2017, although related cash payments continue to be made under the related accruals recorded in connection with these activities. Collectively, the above mentioned restructuring activities are referred to as “Restructuring and other charges.” The following table summarizes the impacts of the Restructuring and other charges (or recoveries, which primarily relate to the reversals of lease abandonment accruals related to previously vacated facilities which are now planned to be utilized) by line of business in connection with the CH2M acquisition for the three and nine months ended June 29, 2018 and the 2015 Restructuring and realignment of the Company's Europe, U.K. and Middle East regional operations for the three and nine months ended June 30, 2017 (in thousands): Three Months Ended Nine Months Ended June 29, 2018 June 30, 2017 June 29, 2018 June 30, 2017 Aerospace, Technology, Environmental and Nuclear $ 16,936 $ (18 ) $ 18,655 $ 1,628 Buildings, Infrastructure and Advanced Facilities 32,423 8,504 53,603 47,697 Energy, Chemicals and Resources 16,379 (652 ) 12,412 35,790 Corporate (1) (19,282 ) 2,866 50,486 30,784 Total $ 46,456 $ 10,700 $ 135,156 $ 115,899 (1) The three month ended June 29, 2018 amounts reflect certain reclassifications between corporate and the lines of businesses associated with the CH2M acquisition to conform with year to date presentations. The activity in the Company’s accrual for the Restructuring and other charges for the nine-month period ended June 29, 2018 is as follows (in thousands): Balance at September 29, 2017 $ 142,767 CH2M acquisition assumed liabilities 31,576 CH2M charges 135,156 Payments and other (133,324 ) Balance at June 29, 2018 $ 176,175 The following table summarizes the Restructuring and other charges by major type of costs in connection with the CH2M acquisition for the three and nine month periods ended June 29, 2018 , and the 2015 Restructuring and realignment of the Company's Europe, U.K. and Middle East regional operations for the three and nine months ended June 30, 2017 (in thousands): Three Months Ended Nine Months Ended June 29, 2018 June 30, 2017 June 29, 2018 June 30, 2017 Lease Abandonments $ 14,678 $ 2,712 $ 55,114 $ 47,313 Involuntary Terminations 10,215 4,120 29,335 34,006 Outside Services 11,418 684 28,176 4,236 Other 10,145 3,184 22,531 30,344 Total $ 46,456 $ 10,700 $ 135,156 $ 115,899 Cumulative amounts incurred to date for Restructuring and other charges by each major type of cost as of June 29, 2018 are as follows (in thousands): Lease Abandonments $ 293,973 Involuntary Terminations 213,914 Outside Services 52,545 Other 55,262 Total $ 615,694

Long-term Debt

Long-term Debt	9 Months Ended
	Jun. 29, 2018
Debt Disclosure [Abstract]
Long-term Debt	Long-term Debt At June 29, 2018 and September 29, 2017 , long-term debt consisted of the following (principal amounts in thousands): Interest Rate Maturity June 29, 2018 September 29, 2017 Revolving Credit Facility LIBOR + applicable margin (1) February 2020 $ 338,816 $ 235,000 Term Loan Facility LIBOR + applicable margin (2) December 2020 1,500,000 — Fixed-rate notes due: Senior Notes, Series A 4.27% May 2025 190,000 — Senior Notes, Series B 4.42% May 2028 180,000 — Senior Notes, Series C 4.52% May 2030 130,000 — Less: Deferred Financing Fees (5,409 ) — Other Varies Varies 3,066 — Total Long-term debt, net $ 2,336,473 $ 235,000 (1) Depending on the Company’s Consolidated Leverage Ratio (as defined in the credit agreement governing the Revolving Credit Facility), borrowings under the Revolving Credit Facility bear interest at either a eurocurrency rate plus a margin of between 1.0% and 1.5% or a base rate plus a margin of between 0% and 0.5% . The applicable LIBOR rates at June 29, 2018 and September 29, 2017 were approximately 1.38% to 3.36% and 1.0% to 2.23% , respectively. (2) Depending on the Company’s Consolidated Leverage Ratio (as defined in the credit agreement governing the Term Loan Facility), borrowings under the Term Loan Facility bear interest at either a eurocurrency rate plus a margin of between 1.0% and 1.5% or a base rate plus a margin of between 0% and 0.5% . The applicable LIBOR rate at June 29, 2018 was approximately 3.72% . On February 7, 2014, Jacobs and certain of its subsidiaries entered into a $1.6 billion long-term unsecured, revolving credit facility (as amended, the “Revolving Credit Facility”) with a syndicate of large U.S. and international banks and financial institutions. The Revolving Credit Facility provides an accordion feature that allows the Company and the lenders to increase the facility amount to $2.1 billion . On September 28, 2017, the Company entered into a Second Amendment to the Revolving Credit Facility, which provides for, among other things, an amendment to certain financial definitions used in the Revolving Credit Facility, including “Consolidated EBITDA” and increases the permitted leverage ratio on a short-term basis in relation to the acquisition of CH2M and future permitted material acquisitions. This Second Amendment was effective upon the consummation of the acquisition of CH2M in December 2017. The Revolving Credit Facility permits the Company to borrow under two separate tranches in U.S. dollars, certain specified foreign currencies, and any other currency that may be approved in accordance with the terms of the Revolving Credit Facility. The Revolving Credit Facility also provides for a financial letter of credit sub facility of $300.0 million , permits performance letters of credit, and provides for a $50.0 million sub facility for swing line loans. Letters of credit are subject to fees based on the Company’s Consolidated Leverage Ratio at the time any such letter of credit is issued. The Company pays a facility fee of between 0.100% and 0.250% per annum depending on the Company’s Consolidated Leverage Ratio. Amounts outstanding under the Revolving Credit Facility may be prepaid at the option of the Company without premium or penalty, subject to customary breakage fees in connection with the prepayment of euro currency loans. The Revolving Credit Facility contains affirmative, negative, and financial covenants customary for financings of this type including, among other things, limitations on certain other indebtedness, investments, liens, acquisitions, dispositions, fundamental changes and transactions with affiliates. In addition, the Revolving Credit Facility contains customary events of default. We were in compliance with the covenants under the Revolving Credit Facility at June 29, 2018 . On September 28, 2017, the Company entered into a $1.5 billion unsecured delayed-draw term loan facility (the “Term Loan Facility”) with a syndicate of financial institutions as lenders and letter of credit issuers. We incurred loans under the Term Loan Facility on December 15, 2017 in connection with the closing of the CH2M acquisition in order to pay cash consideration for the acquisition, and to pay fees and expenses related to the acquisition and the Term Loan Facility. Amounts outstanding under the Term Loan Facility may be prepaid at the option of the Company without premium or penalty, subject to customary breakage fees in connection with the prepayment of eurocurrency loans. The Term Loan Facility contains affirmative, negative and financial covenants customary for financings of this type, including, among other things, limitations on certain other indebtedness, investments, liens, acquisitions, dispositions fundamental changes and transactions with affiliates. In addition, the Term Loan Facility contains customary events of default. We were in compliance with the covenants under the Term Loan Facility at June 29, 2018 . On March 12, 2018, Jacobs entered into a note purchase agreement (as amended, the "Note Purchase Agreement") with respect to the issuance and sale in a private placement transaction of $500.0 million in the aggregate principal amount of the Company’s senior notes in three series (collectively, the “Senior Notes”). The Note Purchase Agreement provides that if the Company's consolidated leverage ratio exceeds a certain amount, the interest on the Senior Notes may increase by 75 basis points. The Senior Notes may be prepaid at any time subject to a make-whole premium. The sale of the Senior Notes closed on May 15, 2018. The Company used the net proceeds from the offering of Senior Notes to repay certain existing indebtedness and for other general corporate purposes. The Note Purchase Agreement contains affirmative, negative and financial covenants customary for financings of this type, including, among other things, covenants to maintain a minimum consolidated net worth and maximum consolidated leverage ratio and limitations on certain other indebtedness, liens, mergers, dispositions and transactions with affiliates. In addition, the Note Purchase Agreement contains customary events of default. We were in compliance with the covenants under the Note Purchase Agreement at June 29, 2018 . In conjunction with the acquisition of CH2M, the Company assumed certain long-term financing that was incurred by CH2M prior to the acquisition. The total balance included in long-term debt assumed as of June 29, 2018 was $3.1 million , which is primarily comprised of equipment financing, bearing interest rates ranging from 0.22% to 3.29% due in monthly installments through September 2021. We believe the carrying value of the Revolving Credit Facility, the Term Loan Facility and Other debt outstanding approximates fair value based on the interest rates and scheduled maturities applicable to the outstanding borrowings. The fair value of the Senior Notes is estimated to be $498.4 million at June 29, 2018 , based on Level 2 inputs. The fair value is determined by discounting future cash flows using interest rates available for issuances with similar terms and average maturities. The Company has issued $2.5 million in letters of credit under the Revolving Credit Facility, leaving $1.3 billion of available borrowing capacity under the Revolving Credit Facility at June 29, 2018 . In addition, the Company had issued $446.7 million under separate, committed and uncommitted letter-of-credit facilities for total issued letters of credit of $449.2 million at June 29, 2018 .

Revenue Accounting for Contract

Revenue Accounting for Contracts / Accounting for Joint Ventures	9 Months Ended
	Jun. 29, 2018
Revenue Accounting For Contracts Accounting For Joint Ventures [Abstract]
Revenue Accounting for Contracts / Accounting for Joint Ventures	Revenue Accounting for Contracts / Accounting for Joint Ventures We recognize revenue earned on our technical professional and field services projects under the percentage-of-completion method described in ASC 605-35, Construction-Type and Production-Type Contracts . In general, we recognize revenues at the time we provide services. Precontract costs are generally expensed as incurred, unless they are directly associated with an anticipated contract and recoverability from that contract is probable. Contracts are generally segmented between types of services, such as project services and construction, and accordingly, gross margin related to each activity is recognized as those separate services are rendered. For multiple contracts with a single customer we account for each contract separately. The percentage-of-completion method of accounting is applied by comparing contract costs incurred to date to the total estimated costs at completion. Contract losses are provided for in their entirety in the period they become known, without regard to the percentage-of-completion. Unapproved change orders are included in the contract price to the extent it is probable that such change orders will result in additional contract revenue and the amount of such additional revenue can be reliably estimated. Claims meeting these recognition criteria are included in revenues only to the extent of the related costs incurred. The percentage of revenues realized by the Company by type of contract during fiscal 2017 can be found in Note 1 Description of Business and Basis of Presentation of Notes to Consolidated Financial Statements included in our 2017 Form 10-K. Certain cost-reimbursable contracts include incentive-fee arrangements. These incentive fees can be based on a variety of factors but the most common are the achievement of target completion dates, target costs, and/or other performance criteria. Failure to meet these targets can result in unrealized incentive fees. We recognize incentive fees based on expected results using the percentage-of-completion method of accounting. As the contract progresses and more information becomes available, the estimate of the anticipated incentive fee that will be earned is revised as necessary. We bill incentive fees based on the terms and conditions of the individual contracts. In certain situations, we are allowed to bill a portion of the incentive fees over the performance period of the contract. In other situations, we are allowed to bill incentive fees only after the target criterion has been achieved. Incentive fees which have been recognized but not billed are included in receivables in the accompanying Consolidated Balance Sheets. Certain cost-reimbursable contracts with government customers as well as certain commercial clients provide that contract costs are subject to audit and adjustment. In this situation, revenues are recorded at the time services are performed based upon the amounts we expect to realize upon completion of the contracts. In those situations where an audit indicates that we may have billed a client for costs not allowable under the terms of the contract, we estimate the amount of such non-billable costs and adjust our revenues accordingly. When we are directly responsible for subcontractor labor or third-party materials and equipment, we reflect the costs of such items in both revenues and costs (and we refer to such costs as “pass-through” costs). On those projects where the client elects to pay for such items directly and we have no associated responsibility for such items, these amounts are not reflected in either revenues or costs. The following table sets forth pass-through costs included in revenues for each of the three and nine month periods ended June 29, 2018 and June 30, 2017 (in thousands): Three Months Ended Nine Months Ended June 29, 2018 June 30, 2017 June 29, 2018 June 30, 2017 Pass-through costs included in revenues $ 889,147 $ 628,070 $ 2,198,197 $ 1,861,615 As is common to the industry, we execute certain contracts jointly with third parties through various forms of joint ventures and consortiums. Although the joint ventures own and hold the contracts with the clients, the services required by the contracts are typically performed by us and our joint venture partners, or by other subcontractors under subcontracting agreements with the joint ventures. The assets of our joint ventures, therefore, consist almost entirely of cash and receivables (representing amounts due from clients), and the liabilities of our joint ventures consist almost entirely of amounts due to the joint venture partners (for services provided by the partners to the joint ventures under their individual subcontracts) and other subcontractors. In general, at any given time, the equity of our joint ventures represents the undistributed profits earned on contracts the joint ventures hold with clients. Very few of our joint ventures have employees. None of our joint ventures have third-party debt or credit facilities. Under U.S. GAAP, our share of profits and losses associated with the contracts held by the joint ventures is reflected in our Consolidated Financial Statements . Certain of our joint ventures meet the definition of a variable interest entity (“VIE”). In evaluating our VIEs for possible consolidation, we perform a qualitative analysis to determine whether or not we have a “controlling financial interest” in the VIE as defined by U.S. GAAP. We consolidate only those VIEs over which we have been determined to be the primary beneficiary. For the Company’s unconsolidated joint ventures, we use either the equity method of accounting or proportionate consolidation. There were no changes in facts and circumstances during the period that caused the Company to reassess the method of accounting for its VIEs.

Defined Pension Benefit Obligat

Defined Pension Benefit Obligations	9 Months Ended
	Jun. 29, 2018
Defined Benefit Plan [Abstract]
Defined Pension Benefit Obligations	Defined Pension Benefit Obligations The following table presents the components of net periodic benefit cost recognized in earnings during the three and nine months ended June 29, 2018 and June 30, 2017 (in thousands): Three Months Ended Nine Months Ended June 29, 2018 June 30, 2017 June 29, 2018 June 30, 2017 Component: Service cost $ 3,720 $ 2,349 $ 8,685 $ 6,749 Interest cost 19,416 9,357 46,987 26,786 Expected return on plan assets (31,388 ) (16,722 ) (76,406 ) (47,837 ) Amortization of previously unrecognized items 2,814 3,770 7,861 10,858 Settlement loss (gain) — 51 3,819 135 $ (5,438 ) $ (1,195 ) $ (9,054 ) $ (3,309 ) In December 2017, the Company incurred a settlement loss of approximately $3.8 million related to its Sverdrup pension plan in the U.S. In connection with the acquisition of CH2M on December 15, 2017, the Company preliminarily recorded estimates of CH2M’s pension plan assets and liabilities which are reflected in the amounts of $1.1 billion and ( $1.2 billion ), respectively. CH2M sponsors several defined benefit pension plans primarily in the U.S. and the U.K. In the U.S., CH2M has three noncontributory defined benefit pension plans. Plan benefits are generally based on years of service and compensation during the span of employment. The following table presents certain information regarding the Company’s cash contributions to our pension plans for fiscal 2018 (in thousands): Cash contributions made during the first nine months of fiscal 2018 $ 18,862 Cash contributions projected for the remainder of fiscal 2018 61,161 Total $ 80,023 During July 2018, the Company made contributions of $55.0 million to our pension plans, primarily for plans acquired as part of the CH2M transaction.

Share-based Payments

Share-based Payments	9 Months Ended
	Jun. 29, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based Payments	Share-based Payments During the first quarter of fiscal year 2018, the Company adopted ASU No 2016-09, Improvements to Employee Share Based Payment Accounting . As a result, the cash paid by the Company to taxing authorities as a result of withholding shares for the exercise of employee stock awards is classified as financing activity and this change is adopted retrospectively. Additionally, all excess tax benefits related to share-based payments in our provision for income taxes are now classified as an operating activity along with other income taxes in the statement of cash flows and this change is applied prospectively. These items were historically recorded in additional paid-in capital and in financing activities. The amount recognized by the Company in excess tax benefits related to share-based payments in our provision for income taxes for the three and nine months ended June 29, 2018 was not material. Finally, we have elected to begin accounting for share-based compensation award forfeitures when they occur instead of estimating the number of forfeitures expected in accordance with the new guidance. This change in accounting policy for share-based compensation award forfeitures resulted in a $1.8 million cumulative effect of change in accounting principle to retained earnings in the Company’s Consolidated Balance Sheets.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	9 Months Ended
	Jun. 29, 2018
Equity [Abstract]
Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income The following table presents the Company's roll forward of accumulated other comprehensive income (loss) after-tax for the nine months ended June 29, 2018 (in thousands): Change in Pension Liabilities Foreign Currency Translation Adjustment Gain/(Loss) on Cash Flow Hedges Total Balance at September 29, 2017 $ (265,578 ) $ (386,141 ) $ (1,795 ) $ (653,514 ) Net other comprehensive income (loss) 10,097 (86,350 ) 1,591 (74,662 ) Balance at June 29, 2018 $ (255,481 ) $ (472,491 ) $ (204 ) $ (728,176 )

Income Taxes

Income Taxes	9 Months Ended
	Jun. 29, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes On December 22, 2017, the Tax Cuts and Jobs Act (the “Act”) was enacted in the United States. The Act reduced the corporate U.S. federal statutory tax rate from 35% to 21% starting on January 1, 2018, resulting in a blended statutory tax rate for fiscal year filers. The Company’s blended federal statutory tax rate for fiscal 2018 is 24.6% . It also requires companies to pay a one-time transition tax on earnings of certain foreign subsidiaries, places limitations and exclusions on varied tax deductions and creates new taxes on certain foreign sourced earnings. The majority of the tax provisions, excluding the change in corporate tax rates, are effective for the first tax year beginning after January 1, 2018, which will be the Company’s taxable year beginning fiscal 2019. Given the significance of the legislation, the SEC staff issued Staff Accounting Bulletin No. 118 (SAB 118), which allows registrants to record provisional amounts during a one year “measurement period” similar to that used when accounting for business combinations. However, the measurement period is deemed to have ended earlier when the registrant has obtained, prepared and analyzed the information necessary to finalize its accounting. During the measurement period, impacts of the law are expected to be recorded at the time a reasonable estimate for all or a portion of the effects can be made, and provisional amounts can be recognized and adjusted as information becomes available, prepared or analyzed. SAB 118 summarizes a three-step process to be applied at each reporting period to account for and qualitatively disclose: (1) the effects of the change in tax law for which accounting is complete; (2) provisional amounts (or adjustments to provisional amounts) for the effects of the tax law where accounting is not complete, but that a reasonable estimate has been determined; and (3) a reasonable estimate cannot yet be made and therefore taxes are reflected in accordance with law prior to the enactment of the Act. As of June 29, 2018 , we have not completed our accounting for the tax effects of the enactment of the Act. However, we have made a provisional estimate of the effects of the statutory tax rate reduction impact on our existing deferred tax balances and the one-time transition tax. We are not yet able to make a reasonable estimate on the other aspects of the Act and continue to account for those items based on our existing accounting under ASC 740, Income Taxes, and the provisions of the tax laws that were in effect immediately prior to enactment of the Act. For the deferred tax balances, we remeasured the U.S. deferred tax assets and liabilities based on the rates at which they are expected to reverse in the future, which is generally 21% . The Company’s revised provisional remeasurement resulted in a $14.0 million net unfavorable discrete charge to income tax expense for the nine months ended June 29, 2018 . In addition, during the first quarter of fiscal 2018 the Company recorded a provisional valuation allowance with respect to certain foreign tax credit deferred tax assets as a result of the Tax Act in the amount of $52.5 million . We are still analyzing many aspects of the Act and refining our calculations, which could potentially affect the measurement of these balances or potentially give rise to new deferred tax assets and liabilities. The Act calls for a one-time tax on deemed repatriation of foreign earnings. This one-time transition tax is based on our total post-1986 earnings and profits (E&P) of certain of our foreign subsidiaries. We have made a provisional estimate of the transition tax. Based upon our review of the Company’s historical foreign tax credit position and post-1986 E&P, it is estimated at this time that the Company should have a $13.1 million expense related to the transition tax. The Company has sufficient foreign tax credits that are expected to offset the transition tax. The net tax cash impact is anticipated to be zero. However, we are still in the process of completing our calculation of the total post-1986 E&P for the newly acquired foreign subsidiaries related to the recent CH2M acquisition. Our estimate may change when we finalize the calculation of post-1986 foreign E&P previously deferred from U.S. federal taxation and finalize the amounts held in cash or other specified assets. The Company’s consolidated effective income tax rate for the three months ended June 29, 2018 decreased to 22.2% from 30.4% when compared to the corresponding period last year. The decrease in the quarterly effective tax rate is primarily due to the reduction in the U.S. statutory tax rate, a $3.6 million discrete benefit related to internal revenue service code section 179D, a nonrecurring benefit of $2.8 million related to tax accounting method changes and a $5.7 million federal hurricane credit. The Company’s consolidated effective income tax rate for the nine months ended June 29, 2018 was 42.7% , an increase from 29.2% for the corresponding period last year. The year over year increase in the effective tax rate is primarily due to an increase of $60.1 million in net discrete charges during the nine -month period. The increase in the discrete charges was primarily comprised of a valuation allowance charge of $52.5 million and a $14.0 million detriment from the provisional remeasurement of the deferred tax items in the U.S, offset by a $5.7 million benefit related to a federal hurricane credit. The amount of income taxes the Company pays is subject to ongoing audits by tax jurisdictions around the world. In the normal course of business, the Company is subject to examination by tax authorities throughout the world, including such major jurisdictions as Australia, Canada, India, the Netherlands, the United Kingdom and the United States. Our estimate of the potential outcome of any uncertain tax issue is subject to our assessment of the relevant risks, facts, and circumstances existing at the time. The Company believes that it has adequately provided for reasonably foreseeable outcomes related to these matters. However, future results may include favorable or unfavorable adjustments to our estimated tax liabilities in the period the assessments are made or resolved, which may impact our effective tax rate. It is reasonably possible that, during the next twelve months, we may realize a decrease in our uncertain tax positions of approximately $7.2 million as a result of concluding various tax audits and closing tax years. On December 15, 2017, the Company completed the acquisition of CH2M. For income tax purposes, the transaction was accounted for as a stock purchase. As a result of the acquisition, the Company adjusted its U.S. GAAP opening balance sheet of CH2M to reflect preliminary estimates of the fair value of the net assets acquired. For income tax purposes, the tax attributes and basis of net assets acquired carryover without any step-up to fair value. The Company has made preliminary estimates and recorded deferred taxes associated with the purchase accounting. It is expected that the Company will make adjustments to the purchase accounting over the relevant measurement period as allowed by ASC 805.

Earnings Per Share and Certain

Earnings Per Share and Certain Related Information	9 Months Ended
	Jun. 29, 2018
Earnings Per Share Reconciliation [Abstract]
Earnings Per Share and Certain Related Information	Earnings Per Share and Certain Related Information Basic and diluted earnings per share (“EPS”) are computed using the two-class method, which is an earnings allocation method that determines EPS for common shares and participating securities. The undistributed earnings are allocated between common shares and participating securities as if all earnings had been distributed during the period. Participating securities and common shares have equal rights to undistributed earnings. Net earnings used for the purpose of determining basic and diluted EPS is determined by taking net earnings, less earnings available to participating securities. The following table reconciles the denominator used to compute basic EPS to the denominator used to compute diluted EPS for the three and nine months ended June 29, 2018 and June 30, 2017 (in thousands): Three Months Ended Nine Months Ended June 29, 2018 June 30, 2017 June 29, 2018 June 30, 2017 Numerator for Basic and Diluted EPS: Net income $ 150,222 $ 89,032 $ 200,972 $ 199,586 Net income allocated to participating securities (629 ) (904 ) (898 ) (2,237 ) Net income allocated to common stock for EPS calculation $ 149,593 $ 88,128 $ 200,074 $ 197,349 Denominator for Basic and Diluted EPS: Weighted average basic shares 142,612 120,429 136,717 120,773 Shares allocated to participating securities (597 ) (1,223 ) (743 ) (1,413 ) Shares used for calculating basic EPS attributable to common stock 142,015 119,206 135,974 119,360 Effect of dilutive securities: Stock compensation plans 1,014 650 1,028 794 Shares used for calculating diluted EPS attributable to common stock 143,029 119,856 137,002 120,154 Basic EPS $ 1.05 $ 0.74 $ 1.47 $ 1.65 Diluted EPS $ 1.05 $ 0.74 $ 1.46 $ 1.64 Share Repurchases On July 23, 2015, the Company’s Board of Directors authorized a share repurchase program of up to $500.0 million of the Company’s common stock, to expire on July 31, 2018. On July 19, 2018, the Company's Board of Directors authorized the continuation of this share repurchase program for an additional three years, to expire on July 31, 2021. There were no share repurchases during the three months ended June 29, 2018. The following table summarizes the activity under this program during fiscal 2018: Amount Authorized Average Price Per Total Shares Shares $500,000,000 $60.77 49,074 49,074 (1) Includes commissions paid and calculated at the average price per share. Share repurchases may be executed through various means including, without limitation, open market transactions, privately negotiated transactions or otherwise. The share repurchase program does not obligate the Company to purchase any shares. The authorization for the share repurchase program may be terminated, increased or decreased by the Company’s Board of Directors in its discretion at any time. The timing of share repurchases may depend upon market conditions, other uses of capital, and other factors. Dividend Program In the fourth fiscal quarter of 2017, the Company declared a dividend of $0.15 per share of the Company’s common stock that was paid in the first fiscal quarter of 2018. In the second and third fiscal quarters of 2018, the Company declared and paid a dividend of $0.15 per share of the Company’s common stock, for a total of $0.45 per share paid during the nine-month period ended June 29, 2018. On July 19, 2018, the Company‘s Board of Directors declared a dividend of $0.15 per share of the Company’s common stock that will be paid on August 31, 2018, to shareholders of record on the close of business on August 3, 2018. Future dividend declarations are subject to review and approval by the Company’s Board of Directors.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Jun. 29, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	18. Commitments and Contingencies In the normal course of business, we make contractual commitments some of which are supported by separate guarantees; and on occasion we are a party in a litigation or arbitration proceeding. The litigation in which we are involved includes personal injury claims, professional liability claims, and breach of contract claims. In most cases, we are the defendant. Where we provide a separate guarantee, it is strictly in support of the underlying contractual commitment. Guarantees take various forms including surety bonds required by law, or standby letters of credit ("LOC") (also referred to as “bank guarantees”) or corporate guarantees given to induce a party to enter into a contract with a subsidiary. Standby LOCs are also used as security for advance payments or in various other transactions. The guarantees have various expiration dates ranging from an arbitrary date to completion of our work (e.g., engineering only) to completion of the overall project. At June 29, 2018 and September 30, 2017, the Company had issued and outstanding approximately $449.2 million and $262.1 million , respectively, in LOCs and $875.3 million and $57.4 million , respectively, in surety bonds. We maintain insurance coverage for most insurable aspects of our business and operations. Our insurance programs have varying coverage limits depending upon the type of insurance, and include certain conditions and exclusions which insurance companies may raise in response to any claim that the Company brings. We have also elected to retain a portion of losses and liabilities that occur through the use of various deductibles, limits, and retentions under our insurance programs. As a result, we may be subject to a future liability for which we are only partially insured or completely uninsured. We intend to mitigate any such future liability by continuing to exercise prudent business judgment in negotiating the terms and conditions of the contracts which the Company enters with its clients. Our insurers are also subject to business risk and, as a result, one or more of them may be unable to fulfill their insurance obligations due to insolvency or otherwise. Additionally, as a contractor providing services to the U.S. federal government we are subject to many types of audits, investigations, and claims by, or on behalf of, the government including with respect to contract performance, pricing, cost allocations, procurement practices, labor practices, and socioeconomic obligations. Furthermore, our income, franchise, and similar tax returns and filings are also subject to audit and investigation by the Internal Revenue Service, most states within the U.S., as well as by various government agencies representing jurisdictions outside the U.S. Our Consolidated Balance Sheets include amounts representing our probable estimated liability relating to such claims, guarantees, litigation, audits, and investigations. We perform an analysis to determine the level of reserves to establish for insurance-related claims that are known and have been asserted against us, as well as for insurance-related claims that are believed to have been incurred based on actuarial analysis, but have not yet been reported to our claims administrators as of the respective balance sheet dates. We include any adjustments to such insurance reserves in our consolidated results of operations. The Company believes, after consultation with counsel, that such guarantees, litigation, U.S. government contract-related audits, investigations and claims, and income tax audits and investigations should not have a material adverse effect on our consolidated financial statements. On September 30, 2015, Nui Phao Mining Company Limited (“NPMC”) commenced arbitration proceedings against Jacobs E&C Australia Pty Limited (“Jacobs E&C”). The arbitration is pending in Singapore before the Singapore International Arbitration Centre. In March 2011, Jacobs E&C was engaged by NPMC for the provision of management, design, engineering, and procurement services for the Nui Phao mine/mineral processing project in Vietnam. In the Notice of Arbitration and in a subsequently filed Statement of Claim and Supplementary Statement of Claim dated February 1, 2016 and February 26, 2016, respectively, NPMC asserts various causes of action and alleges that the quantum of its claim exceeds $167.0 million . Jacobs has denied liability and is vigorously defending this claim. A three-week hearing on the merits concluded on December 15, 2017 and a decision is expected later this year. The Company does not expect the resolution of this matter to have a material adverse effect on its financial condition, results of operations or cash flows. On December 7, 2009, the Judicial Council of California, Administrative Office of the Courts (“AOC”) initiated an action in the San Francisco County Superior Court against Jacobs Facilities Inc. (“JFI”) and Jacobs Project Management (“JPM”) and subsequently added Jacobs as a defendant. The action arises out of a contract between AOC and JFI pursuant to which JFI provided regular maintenance and repairs at certain AOC court facilities. AOC has alleged, among other things, that the Jacobs entities are required under California’s Contractors’ State License Law (“CSLL”) to disgorge certain fees paid by AOC, and the Jacobs entities have, among other things, cross-claimed for unpaid sums for work performed. On May 2, 2012, the jury returned a special verdict in favor of the Jacobs entities finding, among other things, JPM was owed approximately $4.7 million in unpaid fees and that JFI was not required to disgorge the approximate $18.3 million that AOC had paid for work performed. On August 20, 2015, the California Court of Appeal reversed the jury’s verdict, holding that JFI had violated the CSLL. The Court of Appeal remanded to the San Francisco County Superior Court for an evidentiary hearing to determine whether the JFI had “substantially complied” with the CSLL under California Business and Professions Code Section 7031(e). Establishing “substantial compliance” would prevent $18.3 million in disgorgement against Jacobs and permit Jacobs to recover $4.7 million . The evidentiary hearing on substantial compliance was conducted between July 18 and August 5, 2016. On December 29, 2016, the court issued a Statement of Decision in favor of the Company, finding that JFI had substantially complied with the CSLL, and entered a judgment in favor of JPM in the amount of $4.7 million plus prejudgment interest. On January 30, 2017, AOC filed a notice of appeal. On July 13, 2018, the parties agreed to settle this matter. The resolution does not have a material adverse effect on the Company's financial condition, results of operations or cash flows. In 2012, CH2M HILL Australia Pty Limited, a subsidiary of CH2M, entered into a 50 /50 integrated joint venture with Australian construction contractor UGL Infrastructure Pty Limited. The joint venture entered into a Consortium Agreement with General Electric and GE Electrical International Inc. The Consortium was awarded a subcontract by JKC Australia LNG Pty Limited for the engineering, procurement, construction and commissioning of a 360 MW Combined Cycle Power Plant for INPEX Operations Australia Pty Limited at Blaydin Point, Darwin, NT, Australia. In January 2017, the Consortium terminated the Subcontract because of JKC’s repudiatory breach and demobilized from the work site. JKC claimed the Consortium abandoned the work and itself purported to terminate the Subcontract. The Consortium and JKC are now in dispute over the termination. In August 2017, the Consortium filed an International Chamber of Commerce arbitration against JKC for compensatory damages in the amount of $665.5 million for repudiatory breach or, in the alternative, seeking damages for unresolved contract claims and change orders. JKC has provided a preliminary estimate of the monetary value of its claims in the amount of approximately $1.7 billion and has drawn on bonds, CH2M's share of which totals approximately $26 million . This draw on bonds does not impact the Company's ultimate liability. A decision in this matter is not expected before 2020. If the Consortium is found liable, this matter could have a material adverse effect on the Company’s business, financial condition, results of operations and /or cash flows, particularly in the short term. However, the Consortium has denied liability and is vigorously defending these claims, and based on the information currently available, the Company does not expect the resolution of this matter to have a material adverse effect on the Company’s business, financial condition, results of operations, or cash flows.

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
	Jun. 29, 2018
Basis Of Presentation [Abstract]
Use of Estimates and Assumptions	Use of Estimates and Assumptions The preparation of financial statements in conformity with U.S. GAAP requires us to employ estimates and make assumptions that affect the reported amounts of certain assets and liabilities, the revenues and expenses reported for the periods covered by the accompanying consolidated financial statements, and certain amounts disclosed in these Notes to the Consolidated Financial Statements. Although such estimates and assumptions are based on management’s most recent assessment of the underlying facts and circumstances utilizing the most current information available and past experience, actual results could differ significantly from those estimates and assumptions. Our estimates, judgments, and assumptions are evaluated periodically and adjusted accordingly. Please refer to Note 2 Significant Accounting Policies of Notes to Consolidated Financial Statements included in our 2017 Form 10-K for a discussion of the significant estimates and assumptions affecting our consolidated financial statements.
Fair Value and Fair Value Measurements	Fair Value and Fair Value Measurements Certain amounts included in the accompanying consolidated financial statements are presented at “fair value.” Fair value is defined as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants as of the date fair value is determined (the “measurement date”). When determining fair value, we consider the principal or most advantageous market in which we would transact, and we consider only those assumptions we believe a typical market participant would consider when pricing an asset or liability. In measuring fair value, we use the following inputs in the order of priority indicated: Level 1 - Quoted prices in active markets for identical assets or liabilities. Level 2 - Observable inputs other than quoted prices in active markets included in Level 1, such as (i) quoted prices for similar assets or liabilities; (ii) quoted prices in markets that have insufficient volume or infrequent transactions (e.g., less active markets); and (iii) model-driven valuations in which all significant inputs are observable or can be derived principally from, or corroborated with, observable market data for substantially the full term of the asset or liability. Level 3 - Unobservable inputs to the valuation methodology that are significant to the fair value measurement. Please refer to Note 2 Significant Accounting Policies of Notes to Consolidated Financial Statements included in our 2017 Form 10-K for a more complete discussion of the various items within the consolidated financial statements measured at fair value and the methods used to determine fair value. The net carrying amounts of cash and cash equivalents, trade receivables and payables, and notes payable approximate fair value due to the short-term nature of these instruments. See Note 11 Long Term Debt for a discussion of the fair value of long-term debt.
New Accounting Pronouncements	New Accounting Pronouncements From time to time, the Financial Accounting Standards Board (“FASB”) issues accounting standards updates (each being an “ASU”) to its Accounting Standards Codification (“ASC”), which constitutes the primary source of U.S. GAAP. The Company regularly monitors ASUs as they are issued and considers their applicability to its business. All ASUs applicable to the Company are adopted by their effective dates and in the manner prescribed by the FASB. Revenue Recognition In May 2014, the FASB issued ASU No. 2014-09 Revenue from Contracts with Customers. The new guidance provided by ASU 2014-09 is intended to remove inconsistencies and perceived weaknesses in the existing revenue requirements, provide a more robust framework for addressing revenue issues, improve comparability, provide more useful information and simplify the preparation of financial statements. The effective date for ASU 2014-09 is for annual reporting periods beginning after December 15, 2017 and interim periods therein. The Company’s adoption activities are being performed over three phases: (i) assessment, (ii) design, and (iii) implementation. Our assessment and design phases are complete. We have established a cross-functional team to implement ASU 2014-09. As part of the implementation process, the Company has identified the following potentially significant differences to date: Performance Obligations Under current U.S. GAAP, the Company typically segments contracts that contain multiple services by service type, such as engineering, procurement and construction services, for purposes of revenue recognition. Under ASU 2014-09, multiple-service contracts where the Company is responsible for providing a single deliverable (e.g., a constructed asset) will be treated as a single performance obligation for purposes of revenue recognition and thus no longer will be segmented. Typically, this will occur when the company is contracted to perform both engineering and construction on a project. In these circumstances, the timing and pattern of revenue recognition will change. The remainder of the Company's contracts will continue to be treated as a single unit of account because they either contain only one service or because the Company has determined that the component services in the contract are distinct. Contract Modifications In many instances, the Company enters into separate contracts for related services (e.g., engineering and construction) but is held responsible for providing a single deliverable (“Phased Projects”). Under ASU 2014-09, the separate contracts may be required to be combined and treated as a single contract with one performance obligation. This modification or combination of contracts may result in a cumulative catchup adjustment, which will have an immediate impact on the Company’s results of operations in the period the contract combination or modification occurs. In addition, it will change the timing and pattern of revenue recognition after the period the contracts have been combined or modified. The Company analyzed its current Phased Projects and concluded that a number of these arrangements would be combined under ASU 2014-09. Based on the two noted changes above, the Company has identified selected changes to our systems, processes and internal controls and designed updates for each to meet the standard's revised reporting and disclosure requirements. The Company has also assessed the impact of ASU 2014-09 to the recently acquired CH2M business. We will align CH2M's accounting policies, processes and controls with the policies, processes and controls being implemented across the Company. The Company will adopt the new standard using the Modified Retrospective application. This standard could have a significant impact on the Company’s Consolidated Financial Statements and an administrative impact on its operations. The impact will depend on the magnitude of the items discussed above. While the Company will continue to evaluate the impact through the implementation phase, we expect a downward adjustment to retained earnings in the period of adoption due to revenue timing for certain engineering and construction contracts shifting when they are accounted for as a single performance obligation. Lease Accounting In February 2016, the FASB issued ASU 2016-02 Leases . ASU 2016-02 requires lessees to recognize assets and liabilities for most leases. ASU 2016-02 is effective for public entity financial statements for annual periods beginning after December 15, 2018, and interim periods within those annual periods. Early adoption is permitted, including adoption in an interim period. The new guidance currently requires a modified retrospective transition approach for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. In January 2018, the FASB released an exposure draft that, if issued in its current form, would provide us with the option to adopt the provisions of the new guidance prospectively, without adjusting the comparative periods presented. The Company is evaluating the impact of the new guidance on its consolidated financial statements. This standard could have a significant administrative impact on its operations, and the Company will further assess the impact through its implementation program. Other Pronouncements In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. ASU 2017-12 provides financial reporting improvements related to hedging relationships to better portray the economic results of an entity’s risk management activities in its financial statements. Additionally, ASU No. 2017-12 makes certain targeted improvements to simplify the application of the hedge accounting guidance. The revised guidance becomes effective for fiscal years beginning after December 15, 2018 with early adoption permitted. The Company is evaluating the impact of the new guidance on its consolidated financial statements. It is not expected that the updated guidance will have a significant impact on the Company’s consolidated financial statements. ASU 2017-04, Simplifying the Test for Goodwill Impairment, is effective for fiscal years beginning after December 15, 2019 with early adoption permitted. ASU 2017-04 removes the second step of the goodwill impairment test, which requires a hypothetical purchase price allocation. An entity will now recognize a goodwill impairment charge for the amount by which a reporting unit's carrying value exceeds its fair value, not to exceed the amount of goodwill allocated to the reporting unit. Management does not expect the adoption of ASU 2017-04 to have any impact on the Company's financial position, results of operations or cash flows. In March 2017, the FASB issued ASU No. 2017-07, Compensation- Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost . This new standard intends to improve the presentation of net periodic pension cost and net periodic postretirement benefit cost. The new standard requires the service cost component of net periodic cost be reported in the same line item(s) as other employee compensation costs and all other components of the net periodic cost be reported in the consolidated statements of earnings and comprehensive income below operating income. ASU 2017-7 is effective for fiscal years beginning after December 15, 2017 for public companies and early adoption is permitted. Management is currently evaluating the impact that the adoption of ASU 2017-07 will have on the Company's financial position, results of operations and cash flows. In February 2018, the FASB issued ASU 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income , which allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act. ASU 2018-02 is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted. Management is currently evaluating the impact that the adoption of ASU 2018-02 will have on the Company's financial position, results of operations and cash flows.

Business Combinations (Tables)

Business Combinations (Tables)	9 Months Ended
	Jun. 29, 2018
Business Combinations [Abstract]
Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed	The following summarizes the estimated fair values of CH2M assets acquired and liabilities assumed as of the acquisition date (in millions): Assets Cash and cash equivalents $ 315.2 Receivables 1,156.0 Prepaid expenses and other 72.7 Property, equipment and improvements, net 175.1 Goodwill 2,967.1 Identifiable intangible assets: Customer relationships, contracts and backlog 412.3 Lease intangible assets 4.4 Total identifiable intangible assets 416.7 Miscellaneous 353.2 Total Assets $ 5,456.0 Liabilities Notes payable $ 2.2 Accounts payable 309.6 Accrued liabilities 719.3 Billings in excess of costs 265.8 Identifiable intangible liabilities: Lease intangible liabilities 9.6 Long-term debt 705.9 Other deferred liabilities 381.6 Total Liabilities 2,394.0 Noncontrolling interests (37.3 ) Net assets acquired $ 3,024.7
Schedule of Transaction Costs Associated with Acquisition	osts associated with the CH2M acquisition in the accompanying consolidated statements of earnings for the three and nine months ended June 29, 2018 are comprised of the following (in millions): Three Months Ended June 29, 2018 Nine Months Ended June 29, 2018 Personnel costs $ 4.3 $ 50.2 Professional services and other expenses 1.1 27.9 Total $ 5.4 $ 78.1 Personnel co
Summary of Unaudited Proforma Operating Results	presents summarized unaudited pro forma operating results of Jacobs assuming that the Company had acquired CH2M at October 1, 2016. These pro forma operating results are presented for illustrative purposes only and are not indicative of the operating results that would have been achieved had the related events occurred (in millions): Nine Months Ended June 29, June 30, Revenues $ 11,869.8 $ 10,709.9 Net earnings $ 226.1 $ 130.8 Net earnings (loss) attributable to Jacobs $ 222.1 $ 112.7 Net earnings (loss) attributable to Jacobs per share: Basic earnings (loss) per share $ 1.56 $ 0.80 Diluted earnings (loss) per share $ 1.55 $ 0.80 Included in

Goodwill and Intangibles (Table

Goodwill and Intangibles (Tables)	9 Months Ended
	Jun. 29, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Carrying Value of Goodwill by Reportable Segment Appearing in Accompanying Consolidated Balance Sheets	As a result of the segment realignment in the prior quarter (See Note 7, Segment Information ), the historical carrying value of goodwill was allocated to the three remaining reportable segments to present balances on a comparable basis. The carrying value of goodwill appearing in the accompanying Consolidated Balance Sheets at June 29, 2018 and September 29, 2017 was as follows (in millions): Aerospace, Technology, Environmental and Nuclear Buildings, Infrastructure and Advanced Energy, Total Balance September 29, 2017 $ 1,038.2 $ 1,048.8 $ 922.8 $ 3,009.8 Acquired 1,090.9 1,492.1 384.1 2,967.1 Post-Acquisition Adjustments 2.9 (0.1 ) — 2.8 Foreign Exchange Impact (8.2 ) (9.5 ) (7.0 ) (24.7 ) Balance June 29, 2018 $ 2,123.8 $ 2,531.3 $ 1,299.9 $ 5,955.0
Schedule of Acquired Intangibles in Accompanying Consolidated Balance Sheets	The following table provides certain information related to the Company’s acquired intangibles in the accompanying Consolidated Balance Sheets at June 29, 2018 and September 29, 2017 (in thousands): Customer Relationships, Contracts and Backlog Developed Technology Trade Names Patents Lease Other Total Balances September 29, 2017 $ 301,468 $ 14,462 $ 6,699 $ 10,180 $ — $ 111 $ 332,920 Acquisitions 412,300 237 — — 4,415 — 416,952 Post-Acquisition Adjustments 200 (1,921 ) (1,700 ) — — — (3,421 ) Amortization (54,288 ) (1,150 ) (2,292 ) (310 ) (417 ) (38 ) (58,495 ) Foreign currency translation (6,608 ) — (87 ) (597 ) — (7,292 ) Balances June 29, 2018 $ 653,072 $ 11,628 $ 2,620 $ 9,273 $ 3,998 $ 73 $ 680,664
Schedule of Estimated Amortization Expense of Intangible Assets	The following table presents estimated amortization expense of intangible assets for the remainder of fiscal 2018 and for the succeeding years. The amounts below include preliminary amortization estimates for the CH2M opening balance sheet fair values of the customer relationships, contracts and backlog intangible assets that are still preliminary and are subject to change. Fiscal Year (in millions) 2018 (three months remaining) $ 20.8 2019 86.4 2020 83.4 2021 79.8 2022 78.6 Thereafter 322.7 Total $ 671.7

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Jun. 29, 2018
Segment Reporting [Abstract]
Schedule of Total Revenues, Segment Operating Profit and Total Asset for Reporting Segment	The following tables present total revenues and segment operating profit for each reportable segment (in thousands) and includes a reconciliation of segment operating profit to total U.S. GAAP operating profit by including certain corporate-level expenses and expenses relating to the Restructuring and other charges and CH2M transaction and integration costs (in thousands). Prior period information has been recast to reflect the current period presentation. For the Three Months Ended For the Nine Months Ended June 29, 2018 June 30, 2017 June 29, 2018 June 30, 2017 Revenues from External Customers: Aerospace, Technology, Environmental and Nuclear $ 1,221,306 $ 610,643 $ 3,072,900 $ 1,815,871 Buildings, Infrastructure and Advanced Facilities 1,707,072 987,159 4,497,249 2,823,882 Energy, Chemicals and Resources 1,228,285 916,949 3,271,852 2,729,169 Total $ 4,156,663 $ 2,514,751 $ 10,842,001 $ 7,368,922 For the Three Months Ended For the Nine Months Ended June 29, 2018 June 30, 2017 June 29, 2018 June 30, 2017 Segment Operating Profit: Aerospace, Technology, Environmental and Nuclear (1) $ 89,334 $ 49,383 $ 217,003 $ 143,781 Buildings, Infrastructure and Advanced Facilities (2) 145,901 72,991 347,887 191,680 Energy, Chemicals and Resources 61,969 45,792 164,759 120,106 Total Segment Operating Profit 297,204 168,166 729,649 455,567 Other Corporate Expenses (3) (33,131 ) (28,991 ) (110,919 ) (55,625 ) Restructuring and Other Charges (46,922 ) (10,700 ) (135,156 ) (114,666 ) CH2M Transaction Costs (4,422 ) — (76,915 ) — Total U.S. GAAP Operating Profit 212,729 128,475 406,659 285,276 Total Other (Expense) Income, net (4) (19,946 ) (1,079 ) (49,792 ) (11,509 ) Earnings Before Taxes $ 192,783 $ 127,396 $ 356,867 $ 273,767 (1) Includes $15.0 million in charges during the nine month period ended June 29, 2018 associated with a legal matter. (2) Excludes $22.6 million in restructuring and other charges for the nine months ended June 30, 2017. See Note 10, Restructuring and Other Charges . (3) Includes $15.0 million in other corporate charges associated with a certain project for the three months ended June 29, 2018. (4) Includes amortization of deferred financing fees related to the CH2M acquisition of $0.5 million and $1.2 million for the three and nine months ended June 29, 2018 , respectively.
Schedule of Services Revenues for Reportable Segment	The following tables present total services revenues for each reportable segment for the three and nine months ended June 29, 2018 and June 30, 2017 (in thousands). Certain reclassifications have been made in connection with the segment realignment which took place in the second quarter of fiscal 2018. For the Three Months Ended For the Nine Months Ended June 29, 2018 June 29, 2018 Aerospace, Technology, Environmental and Nuclear Buildings, Infrastructure and Advanced Facilities Energy, Chemicals Total Aerospace, Technology, Buildings, Infrastructure and Advanced Facilities Energy, Chemicals Total Technical Professional Services Revenues Project Services $ 592,290 $ 1,265,193 $ 275,884 $ 2,133,367 $ 1,415,382 $ 3,412,655 $ 908,397 $ 5,736,434 Process, Scientific, and Systems Consulting 316,175 2,982 6,971 326,128 823,404 7,453 18,488 849,345 Total Technical Professional Services Revenues 908,465 1,268,175 282,855 2,459,495 2,238,786 3,420,108 926,885 6,585,779 Field Services Revenues Construction 175,154 433,270 680,553 1,288,977 478,893 1,065,879 1,683,296 3,228,068 Operations and Maintenance ("O&M") 137,687 5,627 264,877 408,191 355,221 11,262 661,671 1,028,154 Total Field Services Revenues 312,841 438,897 945,430 1,697,168 834,114 1,077,141 2,344,967 4,256,222 $ 1,221,306 $ 1,707,072 $ 1,228,285 $ 4,156,663 $ 3,072,900 $ 4,497,249 $ 3,271,852 $ 10,842,001 For the Three Months Ended For the Nine Months Ended June 30, 2017 June 30, 2017 Aerospace, Technology, Environmental and Nuclear Buildings, Infrastructure and Advanced Facilities Energy, Chemicals Total Aerospace, Technology, Buildings, Infrastructure and Advanced Facilities Energy, Chemicals Total Technical Professional Services Revenues Project Services $ 232,288 $ 704,940 $ 267,300 $ 1,204,528 $ 619,149 $ 1,992,889 $ 812,008 $ 3,424,046 Process, Scientific, and Systems Consulting 190,955 2,537 5,463 198,955 575,728 8,868 15,554 600,150 Total Technical Professional Services Revenues 423,243 707,477 272,763 1,403,483 1,194,877 2,001,757 827,562 4,024,196 Field Services Revenues Construction 82,295 276,013 483,911 842,219 254,505 811,410 1,445,720 2,511,635 Operations and Maintenance ("O&M") 105,105 3,669 160,275 269,049 366,489 10,715 455,887 833,091 Total Field Services Revenues 187,400 279,682 644,186 1,111,268 620,994 822,125 1,901,607 3,344,726 $ 610,643 $ 987,159 $ 916,949 $ 2,514,751 $ 1,815,871 $ 2,823,882 $ 2,729,169 $ 7,368,922

Receivables (Tables)

Receivables (Tables)	9 Months Ended
	Jun. 29, 2018
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Schedule of Receivables	The following table presents the components of receivables appearing in the accompanying Consolidated Balance Sheets at June 29, 2018 and September 29, 2017 , as well as certain other related information (in thousands): June 29, 2018 September 29, 2017 Components of receivables: Amounts billed, net $ 1,595,644 $ 949,060 Unbilled receivables and other 1,844,918 1,118,144 Retentions receivable 23,135 35,339 Total receivables, net $ 3,463,697 $ 2,102,543 Other information about receivables: Amounts due from the United States federal $ 454,107 $ 226,236 Claims receivable $ 4,600 $ 4,600

Property, Equipment and Impro30

Property, Equipment and Improvements, Net (Tables)	9 Months Ended
	Jun. 29, 2018
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, Equipment and Improvements, Net in the accompanying Consolidated Balance Sheets at June 29, 2018 and September 29, 2017 consist of the following (in thousands): June 29, 2018 September 29, 2017 Land $ 20,010 $ 17,197 Buildings 129,769 93,313 Equipment 715,476 627,609 Leasehold improvements 264,179 220,295 Construction in progress 24,887 21,300 1,154,321 979,714 Accumulated depreciation and amortization (683,217 ) (629,803 ) $ 471,104 $ 349,911

Restructuring and Other Charg31

Restructuring and Other Charges (Tables)	9 Months Ended
	Jun. 29, 2018
Restructuring and Related Activities [Abstract]
Summary of Restructuring and Other Charges Impacts on Reportable Segment Income by Line of Business	The following table summarizes the impacts of the Restructuring and other charges (or recoveries, which primarily relate to the reversals of lease abandonment accruals related to previously vacated facilities which are now planned to be utilized) by line of business in connection with the CH2M acquisition for the three and nine months ended June 29, 2018 and the 2015 Restructuring and realignment of the Company's Europe, U.K. and Middle East regional operations for the three and nine months ended June 30, 2017 (in thousands): Three Months Ended Nine Months Ended June 29, 2018 June 30, 2017 June 29, 2018 June 30, 2017 Aerospace, Technology, Environmental and Nuclear $ 16,936 $ (18 ) $ 18,655 $ 1,628 Buildings, Infrastructure and Advanced Facilities 32,423 8,504 53,603 47,697 Energy, Chemicals and Resources 16,379 (652 ) 12,412 35,790 Corporate (1) (19,282 ) 2,866 50,486 30,784 Total $ 46,456 $ 10,700 $ 135,156 $ 115,899 (1) The three month ended June 29, 2018 amounts reflect certain reclassifications between corporate and the lines of businesses associated with the CH2M acquisition to conform with year to date presentations.
Schedule of Restructuring and Other Activities	The activity in the Company’s accrual for the Restructuring and other charges for the nine-month period ended June 29, 2018 is as follows (in thousands): Balance at September 29, 2017 $ 142,767 CH2M acquisition assumed liabilities 31,576 CH2M charges 135,156 Payments and other (133,324 ) Balance at June 29, 2018 $ 176,175
Summary of Restructuring and Other Activities by Major Type of Costs	The following table summarizes the Restructuring and other charges by major type of costs in connection with the CH2M acquisition for the three and nine month periods ended June 29, 2018 , and the 2015 Restructuring and realignment of the Company's Europe, U.K. and Middle East regional operations for the three and nine months ended June 30, 2017 (in thousands): Three Months Ended Nine Months Ended June 29, 2018 June 30, 2017 June 29, 2018 June 30, 2017 Lease Abandonments $ 14,678 $ 2,712 $ 55,114 $ 47,313 Involuntary Terminations 10,215 4,120 29,335 34,006 Outside Services 11,418 684 28,176 4,236 Other 10,145 3,184 22,531 30,344 Total $ 46,456 $ 10,700 $ 135,156 $ 115,899
Summary of Cumulative Amounts Incurred for Restructuring and Other Activities Costs	Cumulative amounts incurred to date for Restructuring and other charges by each major type of cost as of June 29, 2018 are as follows (in thousands): Lease Abandonments $ 293,973 Involuntary Terminations 213,914 Outside Services 52,545 Other 55,262 Total $ 615,694

Long-term Debt (Tables)

Long-term Debt (Tables)	9 Months Ended
	Jun. 29, 2018
Debt Disclosure [Abstract]
Schedule of Long-term Debt	At June 29, 2018 and September 29, 2017 , long-term debt consisted of the following (principal amounts in thousands): Interest Rate Maturity June 29, 2018 September 29, 2017 Revolving Credit Facility LIBOR + applicable margin (1) February 2020 $ 338,816 $ 235,000 Term Loan Facility LIBOR + applicable margin (2) December 2020 1,500,000 — Fixed-rate notes due: Senior Notes, Series A 4.27% May 2025 190,000 — Senior Notes, Series B 4.42% May 2028 180,000 — Senior Notes, Series C 4.52% May 2030 130,000 — Less: Deferred Financing Fees (5,409 ) — Other Varies Varies 3,066 — Total Long-term debt, net $ 2,336,473 $ 235,000 (1) Depending on the Company’s Consolidated Leverage Ratio (as defined in the credit agreement governing the Revolving Credit Facility), borrowings under the Revolving Credit Facility bear interest at either a eurocurrency rate plus a margin of between 1.0% and 1.5% or a base rate plus a margin of between 0% and 0.5% . The applicable LIBOR rates at June 29, 2018 and September 29, 2017 were approximately 1.38% to 3.36% and 1.0% to 2.23% , respectively.

Revenue Accounting for Contra33

Revenue Accounting for Contracts / Accounting for Joint Ventures (Tables)	9 Months Ended
	Jun. 29, 2018
Revenue Accounting For Contracts Accounting For Joint Ventures [Abstract]
Pass-Through Costs Included in Revenues	The following table sets forth pass-through costs included in revenues for each of the three and nine month periods ended June 29, 2018 and June 30, 2017 (in thousands): Three Months Ended Nine Months Ended June 29, 2018 June 30, 2017 June 29, 2018 June 30, 2017 Pass-through costs included in revenues $ 889,147 $ 628,070 $ 2,198,197 $ 1,861,615

Defined Pension Benefit Oblig34

Defined Pension Benefit Obligations (Tables)	9 Months Ended
	Jun. 29, 2018
Defined Benefit Plan [Abstract]
Schedule of Pension Plans' Net Benefit Obligation	The following table presents the components of net periodic benefit cost recognized in earnings during the three and nine months ended June 29, 2018 and June 30, 2017 (in thousands): Three Months Ended Nine Months Ended June 29, 2018 June 30, 2017 June 29, 2018 June 30, 2017 Component: Service cost $ 3,720 $ 2,349 $ 8,685 $ 6,749 Interest cost 19,416 9,357 46,987 26,786 Expected return on plan assets (31,388 ) (16,722 ) (76,406 ) (47,837 ) Amortization of previously unrecognized items 2,814 3,770 7,861 10,858 Settlement loss (gain) — 51 3,819 135 $ (5,438 ) $ (1,195 ) $ (9,054 ) $ (3,309 )
Defined Contribution Plans	The following table presents certain information regarding the Company’s cash contributions to our pension plans for fiscal 2018 (in thousands): Cash contributions made during the first nine months of fiscal 2018 $ 18,862 Cash contributions projected for the remainder of fiscal 2018 61,161 Total $ 80,023

Other Comprehensive Income (Tab

Other Comprehensive Income (Tables)	9 Months Ended
	Jun. 29, 2018
Equity [Abstract]
Reclassification out of Accumulated Other Comprehensive Income	The following table presents the Company's roll forward of accumulated other comprehensive income (loss) after-tax for the nine months ended June 29, 2018 (in thousands): Change in Pension Liabilities Foreign Currency Translation Adjustment Gain/(Loss) on Cash Flow Hedges Total Balance at September 29, 2017 $ (265,578 ) $ (386,141 ) $ (1,795 ) $ (653,514 ) Net other comprehensive income (loss) 10,097 (86,350 ) 1,591 (74,662 ) Balance at June 29, 2018 $ (255,481 ) $ (472,491 ) $ (204 ) $ (728,176 )

Earnings Per Share and Certai36

Earnings Per Share and Certain Related Information (Tables)	9 Months Ended
	Jun. 29, 2018
Earnings Per Share Reconciliation [Abstract]
Earnings Per Share	The following table reconciles the denominator used to compute basic EPS to the denominator used to compute diluted EPS for the three and nine months ended June 29, 2018 and June 30, 2017 (in thousands): Three Months Ended Nine Months Ended June 29, 2018 June 30, 2017 June 29, 2018 June 30, 2017 Numerator for Basic and Diluted EPS: Net income $ 150,222 $ 89,032 $ 200,972 $ 199,586 Net income allocated to participating securities (629 ) (904 ) (898 ) (2,237 ) Net income allocated to common stock for EPS calculation $ 149,593 $ 88,128 $ 200,074 $ 197,349 Denominator for Basic and Diluted EPS: Weighted average basic shares 142,612 120,429 136,717 120,773 Shares allocated to participating securities (597 ) (1,223 ) (743 ) (1,413 ) Shares used for calculating basic EPS attributable to common stock 142,015 119,206 135,974 119,360 Effect of dilutive securities: Stock compensation plans 1,014 650 1,028 794 Shares used for calculating diluted EPS attributable to common stock 143,029 119,856 137,002 120,154 Basic EPS $ 1.05 $ 0.74 $ 1.47 $ 1.65 Diluted EPS $ 1.05 $ 0.74 $ 1.46 $ 1.64
Share Repurchases	The following table summarizes the activity under this program during fiscal 2018: Amount Authorized Average Price Per Total Shares Shares $500,000,000 $60.77 49,074 49,074 (1) Includes commissions paid and calculated at the average price per share.

Business Combinations - Narrati

Business Combinations - Narrative (Details) - USD ($) shares in Millions	Dec. 29, 2017	Dec. 15, 2017	Jun. 29, 2018	Jun. 29, 2018
Business Acquisition [Line Items]
Decrease in intangible assets				$ 3,421,000
Customer relationships, contracts and backlog
Business Acquisition [Line Items]
Decrease in intangible assets				(200,000)
CH2M HILL Companies, Ltd.
Business Acquisition [Line Items]
Percentage of outstanding shares of common and preferred stock acquired		100.00%
Business combination consideration paid in cash		$ 1,800,000,000
Business combination, cash acquired		315,200,000
Business combination consideration equity issued		$ 1,400,000,000
Business combination consideration equity issued, shares		20.7
Business combination assumed revolving credit facility and second lien notes		$ 705,900,000
Goodwill recognized expected to be deductible for tax purposes		0
Decrease in intangible assets			$ 186,200,000
Decrease in property, equipment and improvements			50,500,000
Decrease in receivables			45,900,000
Increase in accrued liabilities				$ 60,300,000
Increase in miscellaneous long-term assets			75,800,000
Goodwill increase in the period			$ 268,300,000
Business combination assumed pensions and other long-term employee related liabilities included in deferred liabilities		291,000,000
Revenue contributed by acquiree from acquisition date	$ 2,500,000,000
Net earnings contributed by acquiree from acquisition date	87,900,000
Pre-tax restructuring and transaction costs	$ 93,300,000
CH2M HILL Companies, Ltd. | Customer relationships, contracts and backlog
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life				10 years
CH2M HILL Companies, Ltd. | Customer relationships, contracts and backlog | Minimum
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life				9 years
CH2M HILL Companies, Ltd. | Customer relationships, contracts and backlog | Maximum
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life				11 years
CH2M HILL Companies, Ltd. | Other Intangible Assets and Liabilities
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life				10 years
CH2M HILL Companies, Ltd. | Revolving Credit Facility and Second Lien Notes
Business Acquisition [Line Items]
Business combination prepayment penalty		20,000,000
Business combination assumed revolving credit facility and second lien notes		$ 700,000,000

Business Combinations - Summary

Business Combinations - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Jun. 29, 2018	Dec. 15, 2017	Sep. 29, 2017
Assets
Goodwill	$ 5,955,048		$ 3,009,826
CH2M HILL Companies, Ltd.
Assets
Cash and cash equivalents		$ 315,200
Receivables		1,156,000
Prepaid expenses and other		72,700
Property, equipment and improvements, net		175,100
Goodwill		2,967,100
Identifiable intangible assets:
Total identifiable intangible assets		416,700
Miscellaneous		353,200
Total Assets		5,456,000
Liabilities
Notes payable		2,200
Accounts payable		309,600
Accrued liabilities		719,300
Billings in excess of costs		265,800
Identifiable intangible liabilities:
Lease intangible liabilities		9,600
Long-term debt		(705,900)
Other deferred liabilities		381,600
Total Liabilities		2,394,000
Noncontrolling interests		(37,300)
Net assets acquired		3,024,700
CH2M HILL Companies, Ltd. | Customer relationships, contracts and backlog
Identifiable intangible assets:
Total identifiable intangible assets		412,300
CH2M HILL Companies, Ltd. | Lease intangible assets
Identifiable intangible assets:
Total identifiable intangible assets		$ 4,400

Business Combinations - Schedul

Business Combinations - Schedule of Transaction Costs Associated with Acquisition (Details) - CH2M HILL Companies, Ltd. - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jun. 29, 2018	Jun. 29, 2018
Business Acquisition [Line Items]
Personnel costs	$ 4.3	$ 50.2
Professional services and other expenses	1.1	27.9
Total	$ 5.4	$ 78.1

Business Combinations - Summa40

Business Combinations - Summary of Unaudited Proforma Operating Results (Details) - CH2M HILL Companies, Ltd. - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
	Jun. 29, 2018	Jun. 30, 2017
Business Acquisition [Line Items]
Revenues	$ 11,869.8	$ 10,709.9
Net earnings	226.1	130.8
Net earnings (loss) attributable to Jacobs	$ 222.1	$ 112.7
Net earnings (loss) attributable to Jacobs per share:
Basic earnings (loss) per share (in dollars per share)	$ 1.56	$ 0.80
Diluted earnings (loss) per share (in dollars per share)	$ 1.55	$ 0.80
Business acquisitions pro forma income tax expense (benefit)	$ 180.4	$ (14.9)

Goodwill and Intangibles - Sche

Goodwill and Intangibles - Schedule of Carrying Value of Goodwill by Reportable Segment Appearing in Accompanying Consolidated Balance Sheets (Details) $ in Thousands	9 Months Ended
	Jun. 29, 2018USD ($)
Goodwill [Roll Forward]
September 29, 2017	$ 3,009,826
Acquired	2,967,100
Post-Acquisition Adjustments	2,800
Foreign Exchange Impact	(24,700)
June 29, 2018	5,955,048
Aerospace, Technology, Environmental and Nuclear
Goodwill [Roll Forward]
September 29, 2017	1,038,200
Acquired	1,090,900
Post-Acquisition Adjustments	2,900
Foreign Exchange Impact	(8,200)
June 29, 2018	2,123,800
Buildings, Infrastructure and Advanced Facilities
Goodwill [Roll Forward]
September 29, 2017	1,048,800
Acquired	1,492,100
Post-Acquisition Adjustments	(100)
Foreign Exchange Impact	(9,500)
June 29, 2018	2,531,300
Energy, Chemicals and Resources
Goodwill [Roll Forward]
September 29, 2017	922,800
Acquired	384,100
Post-Acquisition Adjustments	0
Foreign Exchange Impact	(7,000)
June 29, 2018	$ 1,299,900

Goodwill and Intangibles - Narr

Goodwill and Intangibles - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Jun. 29, 2018	Jun. 30, 2017	Dec. 30, 2016	Jun. 29, 2018	Jun. 30, 2017	Dec. 29, 2017
Finite-Lived Intangible Assets [Line Items]
Overall foreign currency translation adjustment	$ 114,044	$ (66,763)	$ (287,500)	$ 86,350	$ 179,320
CH2M HILL Companies, Ltd.
Finite-Lived Intangible Assets [Line Items]
Lease intangible liabilities	$ 9,000			$ 9,000		$ 9,600
Goodwill Adjustment
Finite-Lived Intangible Assets [Line Items]
Overstatement adjustment of financial statements line item			$ 209,900

Goodwill and Intangibles - Sc43

Goodwill and Intangibles - Schedule of Acquired Intangibles in Accompanying Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 29, 2018	Jun. 30, 2017
Finite-Lived Intangible Assets and Liabilites [Line Items]
September 29, 2017	$ 332,920
Acquisitions	416,952
Post-Acquisition Adjustments	(3,421)
Amortization	(58,495)	$ (34,891)
Foreign currency translation	(7,292)
June 29, 2018	680,664
Customer relationships, contracts and backlog
Finite-Lived Intangible Assets and Liabilites [Line Items]
September 29, 2017	301,468
Acquisitions	412,300
Post-Acquisition Adjustments	200
Amortization	(54,288)
Foreign currency translation	(6,608)
June 29, 2018	653,072
Developed Technology
Finite-Lived Intangible Assets and Liabilites [Line Items]
September 29, 2017	14,462
Acquisitions	237
Post-Acquisition Adjustments	(1,921)
Amortization	(1,150)
Foreign currency translation	0
June 29, 2018	11,628
Trade Name
Finite-Lived Intangible Assets and Liabilites [Line Items]
September 29, 2017	6,699
Acquisitions	0
Post-Acquisition Adjustments	(1,700)
Amortization	(2,292)
Foreign currency translation	(87)
June 29, 2018	2,620
Patents
Finite-Lived Intangible Assets and Liabilites [Line Items]
September 29, 2017	10,180
Acquisitions	0
Post-Acquisition Adjustments	0
Amortization	(310)
Foreign currency translation	(597)
June 29, 2018	9,273
Lease Intangible Assets
Finite-Lived Intangible Assets and Liabilites [Line Items]
September 29, 2017	0
Acquisitions	4,415
Post-Acquisition Adjustments	0
Amortization	(417)
Foreign currency translation	0
June 29, 2018	3,998
Other
Finite-Lived Intangible Assets and Liabilites [Line Items]
September 29, 2017	111
Acquisitions	0
Post-Acquisition Adjustments	0
Amortization	(38)
Foreign currency translation
June 29, 2018	$ 73

Goodwill and Intangibles - Sc44

Goodwill and Intangibles - Schedule of Estimated Amortization Expense of Intangible Assets (Details) $ in Millions	Jun. 29, 2018USD ($)
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
2018 (three months remaining)	$ 20.8
2,019	86.4
2,020	83.4
2,021	79.8
2,022	78.6
Thereafter	322.7
Total	$ 671.7

Segment Information - Narrative

Segment Information - Narrative (Details)	3 Months Ended	12 Months Ended
	Jun. 29, 2018Business	Sep. 29, 2017segment
Segment Reporting [Abstract]
Number of operating and reporting segments	3	4

Segment Information - Schedule

Segment Information - Schedule of Total Revenues, Segment Operating Profit and Total Asset for Reporting Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 29, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Revenues from External Customers	$ 4,156,663	$ 2,514,751	$ 10,842,001	$ 7,368,922
Total Segment Operating Profit	212,729	128,475	406,659	285,276
Restructuring and Other Charges	(46,922)	(10,700)	(135,156)	(114,666)
Total Other (Expense) Income, net	(19,946)	(1,079)	(49,792)	(11,509)
Earnings Before Taxes	192,783	127,396	356,867	273,767
Restructuring charges excluded segment profit			135,156
CH2M HILL Companies, Ltd.
Segment Reporting Information [Line Items]
CH2M Transaction Costs	(4,422)	0	(76,915)	0
Restructuring charges excluded segment profit	46,456	10,700	135,156	115,899
CH2M HILL Companies, Ltd. | Other Expense
Segment Reporting Information [Line Items]
Restructuring and Other Charges				(1,200)
Amortization of deferred financing fees	500		1,200
Operating Segments
Segment Reporting Information [Line Items]
Total Segment Operating Profit	297,204	168,166	729,649	455,567
Corporate (1)
Segment Reporting Information [Line Items]
Other Corporate Expenses (3)	(33,131)	(28,991)	(110,919)	(55,625)
Other corporate charges associated with a certain project	(15,000)
Corporate (1) | CH2M HILL Companies, Ltd.
Segment Reporting Information [Line Items]
Restructuring charges excluded segment profit	(19,282)	2,866	50,486	30,784
Aerospace, Technology, Environmental and Nuclear
Segment Reporting Information [Line Items]
Revenues from External Customers	1,221,306	610,643	3,072,900	1,815,871
Aerospace, Technology, Environmental and Nuclear | Operating Segments
Segment Reporting Information [Line Items]
Revenues from External Customers	1,221,306	610,643	3,072,900	1,815,871
Total Segment Operating Profit	89,334	49,383	217,003	143,781
Litigation expenses included in segment profit	15,000		15,000
Aerospace, Technology, Environmental and Nuclear | Operating Segments | CH2M HILL Companies, Ltd.
Segment Reporting Information [Line Items]
Restructuring charges excluded segment profit	16,936	(18)	18,655	1,628
Buildings, Infrastructure and Advanced Facilities
Segment Reporting Information [Line Items]
Revenues from External Customers	1,707,072	987,159	4,497,249	2,823,882
Buildings, Infrastructure and Advanced Facilities | Operating Segments
Segment Reporting Information [Line Items]
Revenues from External Customers	1,707,072	987,159	4,497,249	2,823,882
Total Segment Operating Profit	145,901	72,991	347,887	191,680
Restructuring charges excluded segment profit	22,600		22,600
Buildings, Infrastructure and Advanced Facilities | Operating Segments | CH2M HILL Companies, Ltd.
Segment Reporting Information [Line Items]
Restructuring charges excluded segment profit	32,423	8,504	53,603	47,697
Energy, Chemicals and Resources
Segment Reporting Information [Line Items]
Revenues from External Customers	1,228,285	916,949	3,271,852	2,729,169
Energy, Chemicals and Resources | Operating Segments
Segment Reporting Information [Line Items]
Revenues from External Customers	1,228,285	916,949	3,271,852	2,729,169
Total Segment Operating Profit	61,969	45,792	164,759	120,106
Energy, Chemicals and Resources | Operating Segments | CH2M HILL Companies, Ltd.
Segment Reporting Information [Line Items]
Restructuring charges excluded segment profit	$ 16,379	$ (652)	$ 12,412	$ 35,790

Segment Information - Schedul47

Segment Information - Schedule of Total Services Revenues for Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 29, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Revenues	$ 4,156,663	$ 2,514,751	$ 10,842,001	$ 7,368,922
Technical Professional Services
Segment Reporting Information [Line Items]
Revenues	2,459,495	1,403,483	6,585,779	4,024,196
Project Services
Segment Reporting Information [Line Items]
Revenues	2,133,367	1,204,528	5,736,434	3,424,046
Process, Scientific, and Systems Consulting
Segment Reporting Information [Line Items]
Revenues	326,128	198,955	849,345	600,150
Field Services
Segment Reporting Information [Line Items]
Revenues	1,697,168	1,111,268	4,256,222	3,344,726
Construction
Segment Reporting Information [Line Items]
Revenues	1,288,977	842,219	3,228,068	2,511,635
Operations and Maintenance ("O&M")
Segment Reporting Information [Line Items]
Revenues	408,191	269,049	1,028,154	833,091
Aerospace, Technology, Environmental and Nuclear
Segment Reporting Information [Line Items]
Revenues	1,221,306	610,643	3,072,900	1,815,871
Aerospace, Technology, Environmental and Nuclear | Technical Professional Services
Segment Reporting Information [Line Items]
Revenues	908,465	423,243	2,238,786	1,194,877
Aerospace, Technology, Environmental and Nuclear | Project Services
Segment Reporting Information [Line Items]
Revenues	592,290	232,288	1,415,382	619,149
Aerospace, Technology, Environmental and Nuclear | Process, Scientific, and Systems Consulting
Segment Reporting Information [Line Items]
Revenues	316,175	190,955	823,404	575,728
Aerospace, Technology, Environmental and Nuclear | Field Services
Segment Reporting Information [Line Items]
Revenues	312,841	187,400	834,114	620,994
Aerospace, Technology, Environmental and Nuclear | Construction
Segment Reporting Information [Line Items]
Revenues	175,154	82,295	478,893	254,505
Aerospace, Technology, Environmental and Nuclear | Operations and Maintenance ("O&M")
Segment Reporting Information [Line Items]
Revenues	137,687	105,105	355,221	366,489
Buildings, Infrastructure and Advanced Facilities
Segment Reporting Information [Line Items]
Revenues	1,707,072	987,159	4,497,249	2,823,882
Buildings, Infrastructure and Advanced Facilities | Technical Professional Services
Segment Reporting Information [Line Items]
Revenues	1,268,175	707,477	3,420,108	2,001,757
Buildings, Infrastructure and Advanced Facilities | Project Services
Segment Reporting Information [Line Items]
Revenues	1,265,193	704,940	3,412,655	1,992,889
Buildings, Infrastructure and Advanced Facilities | Process, Scientific, and Systems Consulting
Segment Reporting Information [Line Items]
Revenues	2,982	2,537	7,453	8,868
Buildings, Infrastructure and Advanced Facilities | Field Services
Segment Reporting Information [Line Items]
Revenues	438,897	279,682	1,077,141	822,125
Buildings, Infrastructure and Advanced Facilities | Construction
Segment Reporting Information [Line Items]
Revenues	433,270	276,013	1,065,879	811,410
Buildings, Infrastructure and Advanced Facilities | Operations and Maintenance ("O&M")
Segment Reporting Information [Line Items]
Revenues	5,627	3,669	11,262	10,715
Energy, Chemicals and Resources
Segment Reporting Information [Line Items]
Revenues	1,228,285	916,949	3,271,852	2,729,169
Energy, Chemicals and Resources | Technical Professional Services
Segment Reporting Information [Line Items]
Revenues	282,855	272,763	926,885	827,562
Energy, Chemicals and Resources | Project Services
Segment Reporting Information [Line Items]
Revenues	275,884	267,300	908,397	812,008
Energy, Chemicals and Resources | Process, Scientific, and Systems Consulting
Segment Reporting Information [Line Items]
Revenues	6,971	5,463	18,488	15,554
Energy, Chemicals and Resources | Field Services
Segment Reporting Information [Line Items]
Revenues	945,430	644,186	2,344,967	1,901,607
Energy, Chemicals and Resources | Construction
Segment Reporting Information [Line Items]
Revenues	680,553	483,911	1,683,296	1,445,720
Energy, Chemicals and Resources | Operations and Maintenance ("O&M")
Segment Reporting Information [Line Items]
Revenues	$ 264,877	$ 160,275	$ 661,671	$ 455,887

Receivables (Details)

Receivables (Details) - USD ($) $ in Thousands	Jun. 29, 2018	Sep. 29, 2017
Components of receivables:
Amounts billed, net	$ 1,595,644	$ 949,060
Unbilled receivables and other	1,844,918	1,118,144
Retentions receivable	23,135	35,339
Total receivables, net	3,463,697	2,102,543
Other information about receivables:
Amounts due from the United States federal government, included above, net of advanced billings	454,107	226,236
Claims receivable	$ 4,600	$ 4,600

Property, Equipment and Impro49

Property, Equipment and Improvements, Net (Details) - USD ($) $ in Thousands	Jun. 29, 2018	Sep. 29, 2017
Property, Plant and Equipment [Line Items]
Property, equipment and improvements, gross	$ 1,154,321	$ 979,714
Accumulated depreciation and amortization	(683,217)	(629,803)
Property, equipment and improvements, net	471,104	349,911
Land
Property, Plant and Equipment [Line Items]
Property, equipment and improvements, gross	20,010	17,197
Buildings
Property, Plant and Equipment [Line Items]
Property, equipment and improvements, gross	129,769	93,313
Equipment
Property, Plant and Equipment [Line Items]
Property, equipment and improvements, gross	715,476	627,609
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, equipment and improvements, gross	264,179	220,295
Construction in progress
Property, Plant and Equipment [Line Items]
Property, equipment and improvements, gross	$ 24,887	$ 21,300

Restructuring and Other Charg50

Restructuring and Other Charges - Narrative (Details) $ in Millions	3 Months Ended				9 Months Ended
	Jun. 29, 2018USD ($)	Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)	Mar. 27, 2015Business	Jun. 29, 2018USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring pre-tax net charges			$ 22.6
Net realizable value write-offs on contract accounts receivables		$ 16.5
Statutory redundancy and severance costs		1.4
Other liabilities		$ 4.7
Number of lines of business | Business				4
CH2M HILL Companies, Ltd.
Restructuring Cost and Reserve [Line Items]
Restructuring pre-tax net charges	$ 33.9				$ 94.6
Integration related costs	$ 12.6				$ 40.6

Restructuring and Other Charg51

Restructuring and Other Charges - Summary of Restructuring and Other Charges Impacts on Reportable Segment Income by Line of Business (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 29, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			$ 135,156
Operating Segments | Buildings, Infrastructure and Advanced Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 22,600		22,600
CH2M HILL Companies, Ltd.
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	46,456	$ 10,700	135,156	$ 115,899
CH2M HILL Companies, Ltd. | Operating Segments | Aerospace, Technology, Environmental and Nuclear
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	16,936	(18)	18,655	1,628
CH2M HILL Companies, Ltd. | Operating Segments | Buildings, Infrastructure and Advanced Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	32,423	8,504	53,603	47,697
CH2M HILL Companies, Ltd. | Operating Segments | Energy, Chemicals and Resources
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	16,379	(652)	12,412	35,790
CH2M HILL Companies, Ltd. | Corporate (1)
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ (19,282)	$ 2,866	$ 50,486	$ 30,784

Restructuring and Other Charg52

Restructuring and Other Charges - Schedule of Restructuring and Other Activities (Details) $ in Thousands	9 Months Ended
	Jun. 29, 2018USD ($)
Restructuring Reserve [Roll Forward]
Balance at September 29, 2017	$ 142,767
CH2M acquisition assumed liabilities	31,576
CH2M charges	135,156
Payments and other	(133,324)
June 29, 2018	$ 176,175

Restructuring and Other Charg53

Restructuring and Other Charges - Summary of Restructuring and Other Activities by Major Type of Costs (Details) - CH2M HILL Companies, Ltd. - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 29, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 46,456	$ 10,700	$ 135,156	$ 115,899
Lease Abandonments
Restructuring Cost and Reserve [Line Items]
Restructuring costs	14,678	2,712	55,114	47,313
Involuntary Terminations
Restructuring Cost and Reserve [Line Items]
Restructuring costs	10,215	4,120	29,335	34,006
Outside Services
Restructuring Cost and Reserve [Line Items]
Restructuring costs	11,418	684	28,176	4,236
Other
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 10,145	$ 3,184	$ 22,531	$ 30,344

Restructuring and Other Charg54

Restructuring and Other Charges - Summary of Cumulative Amounts Incurred for Restructuring and Other Activities Costs (Details) $ in Thousands	Jun. 29, 2018USD ($)
Restructuring Cost and Reserve [Line Items]
Cumulative amounts incurred to date	$ 615,694
Lease Abandonments
Restructuring Cost and Reserve [Line Items]
Cumulative amounts incurred to date	293,973
Involuntary Terminations
Restructuring Cost and Reserve [Line Items]
Cumulative amounts incurred to date	213,914
Outside Services
Restructuring Cost and Reserve [Line Items]
Cumulative amounts incurred to date	52,545
Other
Restructuring Cost and Reserve [Line Items]
Cumulative amounts incurred to date	$ 55,262

Long-term Debt - Schedule of Lo

Long-term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 29, 2018	Jun. 30, 2017	Sep. 29, 2017
Debt Instrument [Line Items]
Less: Deferred Financing Fees	$ (5,409)		$ 0
Other	3,066		0
Total Long-term debt, net	2,336,473		235,000
Term Loan Facility
Debt Instrument [Line Items]
Total Long-term debt, net	1,500,000		0
Senior Notes, Series A
Debt Instrument [Line Items]
Total Long-term debt, net	$ 190,000		0
Interest Rate	4.27%
Senior Notes, Series B
Debt Instrument [Line Items]
Total Long-term debt, net	$ 180,000		0
Interest Rate	4.42%
Senior Notes, Series C
Debt Instrument [Line Items]
Total Long-term debt, net	$ 130,000		0
Interest Rate	4.52%
Revolving Credit Facility
Debt Instrument [Line Items]
Total Long-term debt, net	$ 338,816		$ 235,000
Minimum | Eurodollar
Debt Instrument [Line Items]
Margin added to variable rate interest rate (percentage)	1.00%
Minimum | Eurodollar | Revolving Credit Facility
Debt Instrument [Line Items]
Margin added to variable rate interest rate (percentage)	1.00%
Minimum | Base Rate
Debt Instrument [Line Items]
Margin added to variable rate interest rate (percentage)	0.00%
Minimum | Base Rate | Revolving Credit Facility
Debt Instrument [Line Items]
Margin added to variable rate interest rate (percentage)	0.00%
Minimum | LIBOR
Debt Instrument [Line Items]
Margin added to variable rate interest rate (percentage)	3.72%
Minimum | LIBOR | Revolving Credit Facility
Debt Instrument [Line Items]
Margin added to variable rate interest rate (percentage)	1.38%	1.00%
Maximum | Eurodollar
Debt Instrument [Line Items]
Margin added to variable rate interest rate (percentage)	1.50%
Maximum | Eurodollar | Revolving Credit Facility
Debt Instrument [Line Items]
Margin added to variable rate interest rate (percentage)	1.50%
Maximum | Base Rate
Debt Instrument [Line Items]
Margin added to variable rate interest rate (percentage)	0.50%
Maximum | Base Rate | Revolving Credit Facility
Debt Instrument [Line Items]
Margin added to variable rate interest rate (percentage)	0.50%
Maximum | LIBOR | Revolving Credit Facility
Debt Instrument [Line Items]
Margin added to variable rate interest rate (percentage)	3.36%	2.23%

Long-term Debt - (Narrative) (D

Long-term Debt - (Narrative) (Details)	6 Months Ended	9 Months Ended
	Mar. 30, 2018tranche	Jun. 29, 2018USD ($)	Sep. 29, 2017USD ($)	Feb. 07, 2014USD ($)
Debt Instrument [Line Items]
Long-term Debt		$ 2,336,473,000	$ 235,000,000
Minimum
Debt Instrument [Line Items]
Facility fee percentage		0.10%
Maximum
Debt Instrument [Line Items]
Facility fee percentage		0.25%
Revolving Credit Facility One Billion Six Hundred Million
Debt Instrument [Line Items]
Available borrowing capacity		$ 1,300,000,000
Term Loan Facility
Debt Instrument [Line Items]
Long-term Debt		1,500,000,000	0
Senior Notes As Amended Note Purchase Agreement
Debt Instrument [Line Items]
Long-term Debt		500,000,000
Long-term debt fair value		498,400,000
Revolving Credit Facility
Debt Instrument [Line Items]
Number of tranches | tranche	2
Long-term Debt		338,816,000	235,000,000
Revolving Credit Facility | Revolving Credit Facility One Billion Six Hundred Million
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity				$ 1,600,000,000
Credit facility, potential borrowing capacity				$ 2,100,000,000
Letter of Credit
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity		300,000,000
Letter of Credit | Revolving Credit Facility One Billion Six Hundred Million
Debt Instrument [Line Items]
Direct borrowings on credit facility		2,500,000
Letter of Credit | Committed And Uncommitted Letter Of Credit Facility
Debt Instrument [Line Items]
Direct borrowings on credit facility		446,700,000
Sub Facility Of Swing Line Loans
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity		50,000,000
CH2M HILL Companies, Ltd.
Debt Instrument [Line Items]
Equipment financing		$ 3,100,000
CH2M HILL Companies, Ltd. | Equipment Financing | Minimum
Debt Instrument [Line Items]
Equipment financing rate		0.22%
CH2M HILL Companies, Ltd. | Equipment Financing | Maximum
Debt Instrument [Line Items]
Equipment financing rate		3.29%
Line of Credit
Debt Instrument [Line Items]
Short-term debt		$ 449,200,000	$ 262,100,000
Senior Notes [Member]
Debt Instrument [Line Items]
Contingent interest rate increase		0.75%

Revenue Accounting for Contra57

Revenue Accounting for Contracts / Accounting for Joint Ventures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 29, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017
Revenue Accounting For Contracts Accounting For Joint Ventures [Abstract]
Pass-through costs included in revenues	$ 889,147	$ 628,070	$ 2,198,197	$ 1,861,615

Defined Pension Benefit Oblig58

Defined Pension Benefit Obligations - Narrative (Details) $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended
	Jul. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Jun. 29, 2018USD ($)	Jun. 30, 2017USD ($)	Jun. 29, 2018USD ($)	Jun. 30, 2017USD ($)
Defined Benefit Plan Disclosure [Line Items]
Payment for pension benefits					$ 18,862
Settlement loss (gain)		$ 3,800	$ 0	$ 51	3,819	$ 135
CH2M HILL Companies, Ltd.
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension plan assets			1,100,000		1,100,000
Defined benefit pension plan liabilities			$ 1,200,000		$ 1,200,000
Number of noncontributory defined benefit pension plans			3		3
Subsequent Event [Member] | CH2M HILL Companies, Ltd.
Defined Benefit Plan Disclosure [Line Items]
Payment for pension benefits	$ 55,000

Defined Pension Benefit Oblig59

Defined Pension Benefit Obligations - Schedule of Pension Plans' Expense (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Jun. 29, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017
Component:
Service cost		$ 3,720	$ 2,349	$ 8,685	$ 6,749
Interest cost		19,416	9,357	46,987	26,786
Expected return on plan assets		(31,388)	(16,722)	(76,406)	(47,837)
Amortization of previously unrecognized items		2,814	3,770	7,861	10,858
Settlement loss (gain)	$ 3,800	0	51	3,819	135
Net periodic benefit		$ (5,438)	$ (1,195)	$ (9,054)	$ (3,309)

Defined Pension Benefit Oblig60

Defined Pension Benefit Obligations - Defined Contribution Plans (Details) $ in Thousands	9 Months Ended
	Jun. 29, 2018USD ($)
Defined Benefit Plan [Abstract]
Cash contributions made during the first nine months of fiscal 2018	$ 18,862
Cash contributions projected for the remainder of fiscal 2018	61,161
Total	$ 80,023

Share-based Payments (Details)

Share-based Payments (Details) $ in Millions	Jun. 29, 2018USD ($)
ASU No 2016-09 | Retained Earnings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative effect of change in accounting principle for share-based compensation award forfeitures	$ 1.8

Other Comprehensive Income (Det

Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 29, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at September 29, 2017			$ (653,514)
Net other comprehensive income (loss)	$ (111,112)	$ 51,622	(74,662)	$ (172,793)
Balance at June 29, 2018	(728,176)		(728,176)
Change in Pension Liabilities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at September 29, 2017			(265,578)
Net other comprehensive income (loss)			10,097
Balance at June 29, 2018	(255,481)		(255,481)
Foreign Currency Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at September 29, 2017			(386,141)
Net other comprehensive income (loss)			(86,350)
Balance at June 29, 2018	(472,491)		(472,491)
Gain/(Loss) on Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at September 29, 2017			(1,795)
Net other comprehensive income (loss)			1,591
Balance at June 29, 2018	$ (204)		$ (204)

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Jun. 29, 2018	Dec. 29, 2017	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017	Sep. 29, 2018
Income Tax Contingency [Line Items]
Measurement period adjustments on effective tax rate				1 year
Provisional remeasurement income tax expense discrete benefit, deferred tax balances				$ 14
Estimated valuation allowance		$ 52.5		(52.5)
Estimated ax on repatriation of foreign earnings				$ 13.1
Effective income tax rate (percent)	22.20%		30.40%	42.70%	29.20%
Discrete tax benefit	$ 3.6			$ 60.1
Nonrecurring benefit	2.8
Federal hurricane credit	5.7
Decrease in unrecognized tax benefits	$ 7.2			$ 7.2
Scenario, Forecast
Income Tax Contingency [Line Items]
Federal statutory tax rate, percent						24.60%

Earnings Per Share and Certai64

Earnings Per Share and Certain Related Information (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 23, 2015	Jun. 29, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017
Numerator for Basic and Diluted EPS:
Net income		$ 150,222,000	$ 89,032,000	$ 200,972,000	$ 199,586,000
Net income allocated to participating securities		(629,000)	(904,000)	(898,000)	(2,237,000)
Net income allocated to common stock for EPS calculation		$ 149,593,000	$ 88,128,000	$ 200,074,000	$ 197,349,000
Denominator for Basic and Diluted EPS:
Weighted average basic shares (in shares)		142,612,000	120,429,000	136,717,000	120,773,000
Shares allocated to participating securities (in shares)		(597,000)	(1,223,000)	(743,000)	(1,413,000)
Shares used for calculating basic EPS attributable to common stock (in shares)		142,015,000	119,206,000	135,974,000	119,360,000
Effect of dilutive securities:
Stock compensation plans (in shares)		1,014,000	650,000	1,028,000	794,000
Shares used for calculating diluted EPS attributable to common stock (in shares)		143,029,000	119,856,000	137,002,000	120,154,000
Basic (in dollars per share)		$ 1.05	$ 0.74	$ 1.47	$ 1.65
Diluted (in dollars per share)		$ 1.05	$ 0.74	$ 1.46	$ 1.64
Share Repurchases
Amount authorized to be repurchased	$ 500,000,000
Average cost per share repurchased (in dollars per share)	$ 60.77
Number of shares repurchased (in shares)	49,074	0

Earnings Per Share and Certai65

Earnings Per Share and Certain Related Information - Narrative (Details) - USD ($)	Jul. 19, 2018	Jul. 23, 2015	Jun. 29, 2018	Mar. 30, 2018	Sep. 29, 2017	Jun. 29, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Amount authorized to be repurchased		$ 500,000,000
Number of shares repurchased (in shares)		49,074	0
Dividends declared (in dollars per share)					$ 0.15
Dividends paid (in dollars per share)				$ 0.15		$ 0.45
Subsequent Event [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dividends declared (in dollars per share)	$ 0.15

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($)	Dec. 29, 2016	Sep. 30, 2015	Aug. 20, 2015	May 02, 2012	Aug. 31, 2017	Jun. 29, 2018	Sep. 29, 2017	Sep. 28, 2012
Loss Contingencies [Line Items]
Litigation amount	$ 4,700,000
UGL Infrastructure Pty Limited
Loss Contingencies [Line Items]
Percentage of ownership interest in joint venture								50.00%
Nui Phao Mining Company
Loss Contingencies [Line Items]
Damages sought		$ 167,000,000
Judicial Council Of California - Unpaid Fees
Loss Contingencies [Line Items]
Litigation amount				$ 4,700,000
Litigation contract amount			$ 4,700,000
Judicial Council Of California, Disgorged Fees
Loss Contingencies [Line Items]
Litigation amount				$ 18,300,000
Litigation contract amount			$ 18,300,000
General Electric and GE Electrical International Inc | Pending Litigation | Minimum
Loss Contingencies [Line Items]
Damages sought					$ 665,500,000
JKC Australia LNG Pty Limited | Pending Litigation
Loss Contingencies [Line Items]
Damages sought					1,700,000,000
Line of Credit
Loss Contingencies [Line Items]
Short-term debt						$ 449,200,000	$ 262,100,000
Surety Bond
Loss Contingencies [Line Items]
Short-term debt						$ 875,300,000	$ 57,400,000
CH2M HILL Companies, Ltd. | JKC Australia LNG Pty Limited | Pending Litigation
Loss Contingencies [Line Items]
Damages sought					$ 26,000,000