Jacobs Engineering (J) 10-K 21 Nov 23 2023 FY Annual report Financial data

Cover Page

Cover Page - USD ($) $ in Billions	12 Months Ended
	Sep. 29, 2023	Nov. 10, 2023	Mar. 31, 2023
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Sep. 29, 2023
Current Fiscal Year End Date	--09-29
Document Transition Report	false
Entity File Number	1-7463
Entity Registrant Name	Jacobs Solutions Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	88-1121891
Entity Address, Address Line One	1999 Bryan Street
Entity Address, Address Line Two	Suite 3500
Entity Address, City or Town	Dallas
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	75201
City Area Code	214
Local Phone Number	583 – 8500
Title of 12(b) Security	Common Stock
Trading Symbol	J
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		126,024,433
Entity Public Float			$ 14.6
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE Portions of the Registrant’s definitive proxy statement to be issued in connection with its 2024 annual meeting of shareholders are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated.
Entity Central Index Key	0000052988
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Amendment Flag	false
Document Financial Statement Error Correction [Flag]	false

Audit Information

Audit Information	12 Months Ended
	Sep. 29, 2023
Auditor [Abstract]
Auditor Firm ID	42
Auditor Name	Ernst & Young LLP
Auditor Location	Dallas, Texas

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 29, 2023	Sep. 30, 2022
Current Assets:
Cash and cash equivalents	$ 926,582	$ 1,140,479
Receivables and contract assets	3,558,806	3,405,381
Prepaid expenses and other	204,965	176,134
Total current assets	4,690,353	4,721,994
Property, Equipment and Improvements, net	357,032	346,676
Other Noncurrent Assets:
Goodwill	7,343,526	7,184,658
Intangibles, net	1,271,943	1,394,052
Deferred income tax assets	53,131	31,480
Operating lease right-of-use assets	414,384	476,913
Miscellaneous	486,740	504,646
Total other noncurrent assets	9,569,724	9,591,749
Total assets	14,617,109	14,660,419
Current Liabilities:
Short-term debt	61,430	50,415
Accounts payable	1,143,802	966,792
Accrued liabilities	1,301,644	1,441,762
Operating lease liability	152,077	150,171
Contract liabilities	763,608	641,705
Total current liabilities	3,422,561	3,250,845
Long-term debt	2,813,471	3,357,256
Liabilities relating to defined benefit pension and retirement plans	258,540	271,332
Deferred income tax liabilities	221,158	269,077
Long-term operating lease liability	543,230	607,447
Other deferred liabilities	125,088	167,548
Commitments and Contingencies
Redeemable Noncontrolling Interests	632,979	632,522
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 - 125,976,998 shares and 127,393,378 shares as of September 29, 2023 and September 30, 2022, respectively	125,977	127,393
Additional paid-in capital	2,735,325	2,682,009
Retained earnings	4,542,872	4,225,784
Accumulated other comprehensive loss	(857,954)	(975,130)
Total Jacobs stockholders’ equity	6,546,220	6,060,056
Noncontrolling interests	53,862	44,336
Total Group stockholders’ equity	6,600,082	6,104,392
Total liabilities and stockholders' equity	$ 14,617,109	$ 14,660,419

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Sep. 29, 2023	Sep. 30, 2022
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, authorized (in shares)	1,000,000,000	1,000,000,000
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)	125,976,998	127,393,378
Common stock, outstanding (in shares)	125,976,998	127,393,378

CONSOLIDATED STATEMENTS OF EARN

CONSOLIDATED STATEMENTS OF EARNINGS - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Income Statement [Abstract]
Revenues	$ 16,352,414	$ 14,922,825	$ 14,092,632
Direct cost of contracts	(12,879,099)	(11,595,785)	(11,048,860)
Gross profit	3,473,315	3,327,040	3,043,772
Selling, general and administrative expenses	(2,398,078)	(2,409,190)	(2,355,683)
Operating Profit	1,075,237	917,850	688,089
Other Income (Expense):
Interest income	26,013	4,489	3,503
Interest expense	(168,108)	(100,246)	(72,714)
Miscellaneous (expense) income, net	(16,463)	54,254	76,724
Total other (expense) income, net	(158,558)	(41,503)	7,513
Earnings from Continuing Operations Before Taxes	916,679	876,347	695,602
Income Tax Expense for Continuing Operations	(196,181)	(160,903)	(274,781)
Net Earnings of the Group from Continuing Operations	720,498	715,444	420,821
Net (Loss) Earnings of the Group from Discontinued Operations	(842)	(32)	10,008
Net Earnings of the Group	719,656	715,412	430,829
Net Earnings Attributable to Noncontrolling Interests from Continuing Operations	(32,265)	(36,788)	(39,213)
Net (Earnings) Loss Attributable to Redeemable Noncontrolling Interests	(21,614)	(34,585)	85,414
Net Earnings Attributable to Jacobs from Continuing Operations	666,619	644,071	467,022
Net Earnings Attributable to Jacobs	$ 665,777	$ 644,039	$ 477,030
Net Earnings Per Share:
Basic Net Earnings from Continuing Operations Per Share (in dollars per share)	$ 5.33	$ 5.01	$ 3.15
Basic Net (Loss) Earnings from Discontinued Operations Per Share (in dollars per share)	(0.01)	0	0.08
Basic Earnings Per Share (in dollars per share)	5.32	5.01	3.22
Diluted Net Earnings from Continuing Operations Per Share (in dollars per share)	5.31	4.98	3.12
Diluted Net (Loss) Earnings from Discontinued Operations Per Share (in dollars per share)	(0.01)	0	0.08
Diluted Earnings Per Share (in dollars per share)	$ 5.30	$ 4.98	$ 3.20

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Statement of Comprehensive Income [Abstract]
Net Earnings of the Group	$ 719,656	$ 715,412	$ 430,829
Other Comprehensive Income (Loss):
Foreign currency translation adjustment	148,971	(397,819)	15,585
Change in cash flow hedges	(20,500)	154,541	29,332
Change in pension plan liabilities	(16,389)	92,527	142,135
Other comprehensive income (loss) before taxes	112,082	(150,751)	187,052
Income Tax Benefit (Expense):
Foreign currency translation adjustment	1,132	19,019	(3,110)
Cash flow hedges	5,870	(43,595)	(7,357)
Change in pension plan liabilities	(1,908)	(5,361)	(37,970)
Income Tax Benefit (Expense):	5,094	(29,937)	(48,437)
Net other comprehensive income (loss)	117,176	(180,688)	138,615
Net Comprehensive Income of the Group	836,832	534,724	569,444
Net Earnings Attributable to Noncontrolling Interests	(32,265)	(36,788)	(39,213)
Net (Earnings) Loss Attributable to Redeemable Noncontrolling Interests	(21,614)	(34,585)	85,414
Net Comprehensive Income Attributable to Jacobs	$ 782,953	$ 463,351	$ 615,645

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Total Jacobs Stockholders’ Equity	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Balance at the beginning of the period at Oct. 02, 2020	$ 5,855,667	$ 5,815,712	$ 129,748	$ 2,598,446	$ 4,020,575	$ (933,057)	$ 39,955
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	516,243	477,030			477,030		39,213
Foreign currency translation adjustments, net of deferred taxes	12,475	12,475				12,475
Pension and retiree medical plan liability, net of deferred taxes	104,165	104,165				104,165
Change in cash flow hedges, net of deferred taxes	21,975	21,975				21,975
Dividends	(109,616)	(109,616)			(109,616)
Noncontrolling interests - distributions and other	(44,372)						(44,372)
Stock based compensation	56,221	56,221		56,221
Redeemable Noncontrolling interests redemption value adjustment	(175,183)	(175,183)			(175,183)
Issuances of equity securities including shares withheld for taxes	12,210	12,210	871	20,345	(9,006)
Repurchases of equity securities	(274,948)	(274,948)	(1,726)	(85,000)	(188,222)
Balance at the end of the period at Oct. 01, 2021	5,974,837	5,940,041	128,893	2,590,012	4,015,578	(794,442)	34,796
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	680,827	644,039			644,039		36,788
Foreign currency translation adjustments, net of deferred taxes	(378,800)	(378,800)				(378,800)
Pension and retiree medical plan liability, net of deferred taxes	87,166	87,166				87,166
Change in cash flow hedges, net of deferred taxes	110,946	110,946				110,946
Dividends	(118,291)	(118,291)			(118,291)
Noncontrolling interests - distributions and other	(27,248)						(27,248)
Stock based compensation	53,383	53,383		53,383
Redeemable Noncontrolling interests redemption value adjustment	(27,657)	(27,657)			(27,657)
Repurchase and issuance of redeemable noncontrolling interests	2,618	2,618			2,618
Issuances of equity securities including shares withheld for taxes	28,537	28,537	973	39,537	(11,973)
Repurchases of equity securities	(281,926)	(281,926)	(2,473)	(923)	(278,530)
Balance at the end of the period at Sep. 30, 2022	6,104,392	6,060,056	127,393	2,682,009	4,225,784	(975,130)	44,336
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	698,042	665,777			665,777		32,265
Foreign currency translation adjustments, net of deferred taxes	150,103	150,103				150,103
Pension and retiree medical plan liability, net of deferred taxes	(18,297)	(18,297)				(18,297)
Change in cash flow hedges, net of deferred taxes	(14,630)	(14,630)				(14,630)
Dividends	(132,468)	(132,468)			(132,468)
Noncontrolling interests - distributions and other	(22,739)						(22,739)
Stock based compensation	74,337	74,337		74,337
Redeemable Noncontrolling interests redemption value adjustment	(10,770)	(10,770)			(10,770)
Repurchase and issuance of redeemable noncontrolling interests	14,293	14,293			14,293
Issuances of equity securities including shares withheld for taxes	23,533	23,533	910	28,181	(5,558)
Repurchases of equity securities	(265,714)	(265,714)	(2,326)	(49,202)	(214,186)
Balance at the end of the period at Sep. 29, 2023	$ 6,600,082	$ 6,546,220	$ 125,977	$ 2,735,325	$ 4,542,872	$ (857,954)	$ 53,862

CONSOLIDATED STATEMENTS OF ST_2

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Statement of Stockholders' Equity [Abstract]
Foreign currency translation adjustments, deferred taxes	$ (1,132)	$ (19,019)	$ 3,110
Pension plan liability, deferred taxes	1,908	5,361	37,970
Change in cash flow hedges, deferred taxes	$ (5,870)	$ 43,595	$ 7,357

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Cash Flows from Operating Activities:
Net earnings attributable to the Group	$ 719,656	$ 715,412	$ 430,829
Depreciation and amortization:
Property, equipment and improvements	103,346	102,454	101,024
Intangible assets	203,906	198,602	149,776
Gain on sale of ECR business	0	0	(15,608)
Gain on investment in equity securities	0	(13,862)	(71,325)
Stock based compensation	74,337	53,383	56,221
Equity in earnings of operating ventures, net of return on capital distributions	(324)	18,291	10,941
Loss (gain) on disposals of assets, net	7,690	(4,680)	1,003
Impairment of equity method investment and other long-term assets	48,163	78,292	40,640
Loss on pension and retiree medical plan changes	208	123	2,783
Deferred income taxes	(76,815)	111,846	113,623
Changes in assets and liabilities, excluding the effects of businesses acquired:
Receivables and contract assets, net of contract liabilities	(8,395)	(267,947)	242,154
Prepaid expenses and other current assets	(33,996)	6	6,800
Miscellaneous other assets	92,050	113,850	116,097
Accounts payable	166,194	87,402	(165,502)
Income taxes payable	9,408	(70,258)	20,961
Accrued liabilities	(279,136)	(552,036)	(252,305)
Other deferred liabilities	(49,957)	(73,697)	(63,915)
Other, net	(1,572)	(22,472)	2,079
Net cash provided by operating activities	974,763	474,709	726,276
Cash Flows from Investing Activities:
Additions to property and equipment	(137,486)	(127,615)	(92,814)
Disposals of property and equipment and other assets	1,544	9,392	474
Capital contributions to equity investees, net of return of capital distributions	7,964	3,025	(5,016)
Acquisitions of businesses, net of cash acquired	(17,685)	(437,083)	(1,741,062)
Disposals of investment in equity securities	0	13,862	421,315
Proceeds from sales of businesses	0	0	36,360
Net cash used for investing activities	(145,663)	(538,419)	(1,380,743)
Cash Flows from Financing Activities:
Proceeds from long-term borrowings	3,860,468	3,145,500	4,445,080
Repayments of long-term borrowings	(4,486,679)	(2,420,166)	(3,216,965)
Proceeds from short-term borrowings	13,011	0	0
Repayments of short-term borrowings	(3,353)	(6,359)	(7,675)
Debt issuance costs	(17,177)	0	(2,747)
Proceeds from issuances of common stock	47,782	51,034	38,077
Common stock repurchases	(265,714)	(281,926)	(274,948)
Taxes paid on vested restricted stock	(24,249)	(28,587)	(25,867)
Cash dividends to shareholders	(128,420)	(115,948)	(107,188)
Net dividends associated with noncontrolling interests	(23,156)	(26,982)	(48,784)
Repurchase of redeemable noncontrolling interests	(92,939)	(46,074)	0
Proceeds from issuances of redeemable noncontrolling interests	34,016	49,742	0
Net cash (used for) provided by financing activities	(1,086,410)	320,234	798,983
Effect of Exchange Rate Changes	32,548	(128,892)	19,635
Net (Decrease) Increase in Cash and Cash Equivalents and Restricted Cash	(224,762)	127,632	164,151
Cash and Cash Equivalents, including Restricted Cash, at the Beginning of the Period	1,154,207	1,026,575	862,424
Cash and Cash Equivalents, including Restricted Cash, at the End of the Period	$ 929,445	$ 1,154,207	$ 1,026,575

Description of Business and Bas

Description of Business and Basis of Presentation	12 Months Ended
	Sep. 29, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Basis of Presentation	Description of Business and Basis of Presentation Description of Business Jacobs Solutions Inc. ("Jacobs" or "the Company") is a leading global professional services company that designs and deploys technology-centric solutions to solve many of the world’s most complex challenges. In fiscal 2023 we operated in four operating segments: Critical Mission Solutions, People & Places Solutions, Divergent Solutions, and our investment in PA Consulting Group Limited ("PA Consulting"). 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, Europe, the Middle East, India, Australia, New Zealand and Asia. We provide our services under cost-reimbursable and fixed-price contracts, with our fixed-price contracts comprised mainly of professional services arrangements and in some limited cases, construction. The percentage of revenues realized from each of these types of contracts for the fiscal years ended September 29, 2023, September 30, 2022 and October 1, 2021 was as follows: For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 Cost-reimbursable 74.1% 74% 76% Fixed-price 25.9% 26% 24% Basis of Presentation, Definition of Fiscal Year, and Other Matters The accompanying Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States ("U.S. GAAP") and include the accounts of Jacobs Solutions Inc. and its subsidiaries and affiliates which it controls. On August 29, 2022, Jacobs Engineering Group Inc. (JEGI), the predecessor to Jacobs Solutions Inc., implemented a holding company structure, which resulted in Jacobs Solutions Inc. becoming the parent company of, and successor issuer to, JEGI (the "Holding Company Reorganization"). Prior to the implementation date, the Consolidated Financial Statements include the accounts of JEGI and its subsidiaries and affiliates which it controlled. All intercompany accounts and transactions have been eliminated in consolidation. The Company’s fiscal year ends on the Friday closest to September 30 (determined on the basis of the number of workdays) and, accordingly, an additional week of activity is added every five-to-six years. Fiscal 2020 included an extra week of activity. On November 20, 2023, Jacobs entered into a definitive agreement to spin-off and combine our CMS and Cyber and Intelligence government services (part of Divergent Solutions ("DVS")) businesses with Amentum, in a Reverse Morris Trust transaction intended to be tax-free to Jacobs’ shareholders for U.S. federal income tax purposes. The transaction, which is expected to close in fiscal year 2024, is subject to regulatory approvals and other customary closing conditions. As part of the new Company strategy, during the first quarter of fiscal 2023, Jacobs formed a reporting and operating segment, Divergent Solutions ("DVS"), to further strengthen our ability to drive value for our clients (the "DVS segment reorganization"). For a further discussion of our segment information, please refer to Note 19- Segment Information . On February 4, 2022, the Company acquired StreetLight Data, Inc. ("StreetLight"). StreetLight is a pioneer of mobility analytics who uses its data and machine learning resources to shed light on mobility and enable users to solve complex transportation problems. The Company paid total base consideration of approximately $190.8 million in cash and issued $0.9 million in equity and $5.2 million in in-the-money stock options to the former owners of StreetLight. The Company also paid off StreetLight's debt of approximately $1.0 million simultaneously with the consummation of the acquisition. The Company has recorded its final purchase price allocation associated with the acquisition, which is summarized in Note 15- Other Business Combinations. On November 19, 2021, Jacobs acquired BlackLynx, a provider of high-performance software, to complement Jacobs' portfolio of cyber, intelligence and digital solutions. The Company paid total base consideration of approximately $235.4 million in cash to the former owners of BlackLynx. In conjunction with the acquisition, the Company also paid off BlackLynx's debt of approximately $5.3 million simultaneously with the consummation of the acquisition. The Company has recorded its final purchase price allocation associated with the acquisition, which is summarized in Note 15- Other Business Combinations. On March 2, 2021, Jacobs completed the strategic investment of a 65% interest in PA Consulting, a UK-based leading innovation and transformation consulting firm. The total consideration paid by the Company was $1.7 billion, funded through cash on hand, proceeds from a new term loan and draws on the Company's existing Revolving Credit Facility. The remaining 35% interest was acquired by PA Consulting employees, whose redeemable noncontrolling interests had a fair value of $582.4 million on the closing date, including subsequent purchase accounting adjustments. PA Consulting is accounted for as a consolidated subsidiary and as a separate operating segment. The Company has recorded its final purchase price allocation associated with the acquisition. See Note 14- PA Consulting Business Combination for more discussion on the investment and Note 9- Borrowings for more discussion on the financing for the transaction. On November 24, 2020, a subsidiary of Jacobs completed the acquisition of Buffalo Group, a leader in advanced cyber and intelligence solutions which allows Jacobs to further expand its cyber and intelligence solutions offerings to government clients. The Company paid total consideration o f $190.1 million, which was comprised of approximately $182.4 million in cash to the former owners of Buffalo Group and contingent consideration of $7.7 million The contingent consideration was subsequently recognized in fiscal 2021 as an offset to selling, general and administrative expense when it was determined no amounts would be paid. In conjunction with the acquisition, the Company assumed the Buffalo Group's debt of approximately $7.7 million. The Company repaid all of the assumed Buffalo Group debt by the end of the first fiscal quarter of 2021. The Company has recorded its final purchase price allocation associated with the acquisition, which is summarized in Note 15- Other Business Combinations. On April 26, 2019, Jacobs completed the sale of its Energy, Chemicals and Resources ("ECR") business to Worley Limited, a company incorporated in Australia ("Worley"), for a purchase price of $3.4 billion consisting of (i) $2.8 billion in cash plus (ii) 58.2 million ordinary shares of Worley, subject to adjustments for changes in working capital and certain other items (the “ECR sale”). As a result of the ECR sale, substantially all ECR-related assets and liabilities were sold (the "Disposal Group"). We determined that the Disposal Group should be reported as discontinued operations in accordance with ASC 210-05, Discontinued Operations

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Sep. 29, 2023
Accounting Policies [Abstract]
Significant Accounting Policies	Significant Accounting Policies Revenue Accounting for Contracts Engineering, Procurement & Construction Contracts, Service Contracts and Software Contracts The Company recognizes engineering, procurement, and construction contract revenue over time, as performance obligations are satisfied, due to the continuous transfer of control to the customer in accordance with ASC Topic 606, Revenue from Contracts with Customers . Contracts which include engineering, procurement and construction services are generally accounted for as a single deliverable (a single performance obligation) and are no longer segmented between types of services. In some instances, the Company’s services associated with a construction activity are limited to specific tasks such as customer support, consulting or supervisory services. In these instances, the services are typically identified as separate performance obligations. The Company recognizes revenue using the percentage-of-completion method, based primarily on contract costs incurred to date compared to total estimated contract costs. The percentage-of-completion method (an input method) is the most representative depiction of the Company’s performance because it directly measures the value of the services transferred to the customer. Subcontractor materials, labor and equipment and, in certain cases, customer-furnished materials and labor and equipment are included in revenue and cost of revenue when management believes that the company is acting as a principal rather than as an agent (e.g., the company integrates the materials, labor and equipment into the deliverables promised to the customer or is otherwise primarily responsible for fulfillment and acceptability of the materials, labor and/or equipment). The Company recognizes revenue, but not profit, on certain uninstalled materials that are not specifically produced, fabricated, or constructed for a project. Revenue on these uninstalled materials is recognized when control is transferred. Changes to total estimated contract cost or losses, if any, are recognized in the period in which they are determined as assessed at the contract level. Pre-contract costs are expensed as incurred unless they are expected to be recovered from the client. Project mobilization costs are generally charged to project costs as incurred when they are an integrated part of the performance obligation being transferred to the client. Under the typical payment terms of our engineering, procurement and construction contracts, amounts are billed as work progresses in accordance with agreed-upon contractual terms at periodic intervals (e.g., biweekly or monthly) and customer payments are typically due within 30 to 60 days of billing, depending on the contract. For service contracts, the Company recognizes revenue over time using the cost-to-cost percentage-of-completion method. Service contracts that include multiple performance obligations are segmented between types of services. For contracts with multiple performance obligations, the Company allocates the transaction price to each performance obligation using an estimate of the stand-alone selling price of each distinct service in the contract. In some instances where the Company is standing ready to provide services, the Company recognizes revenue ratably over the service period. Under the typical payment terms of our service contracts, amounts are billed as work progresses in accordance with agreed-upon contractual terms, and customer payments are typically due within 30 to 60 days of billing, depending on the contract. Revenue for certain contracts related to the sale of software licenses is recognized at a point in time, typically at the time of delivery, in accordance with ASC 606. The software license sale will be treated as a performance obligation separate and distinct from any related service and maintenance. Direct costs of contracts include all costs incurred in connection with and directly for the benefit of client contracts, including depreciation and amortization relating to assets used in providing the services required by the related projects. The level of direct costs of contracts may fluctuate between reporting periods due to a variety of factors, including the amount of pass-through costs we incur during a period. On those projects where we are acting as principal for subcontract labor or third-party materials and equipment, we reflect the amounts of such items in both revenues and costs (and we refer to such costs as “pass-through costs”). Back charges to suppliers or subcontractors are recognized as a reduction of cost when it is determined that recovery of such cost is probable and the amounts can be reliably estimated. Disputed back charges are recognized when the same requirements described above have been satisfied. Variable Consideration The nature of the Company’s contracts gives rise to several types of variable consideration, including claims and unpriced change orders; awards and incentive fees; and liquidated damages and penalties. The Company recognizes revenue for variable consideration when it is probable that a significant reversal in the amount of cumulative revenue recognized will not occur. The Company estimates the amount of revenue to be recognized on variable consideration using the expected value (i.e., the sum of a probability-weighted amount) or the most likely amount method, whichever is expected to better predict the amount. Factors considered in determining whether revenue associated with claims (including change orders in dispute and unapproved change orders in regard to both scope and price) should be recognized include the following: (a) the contract or other evidence provides a legal basis for the claim, (b) additional costs were caused by circumstances that were unforeseen at the contract date and not the result of deficiencies in the company’s performance, (c) claim-related costs are identifiable and considered reasonable in view of the work performed, and (d) evidence supporting the claim is objective and verifiable. If the requirements for recognizing revenue for claims or unapproved change orders are met, revenue is recorded only when the costs associated with the claims or unapproved change orders have been incurred and only up to the amount of cost incurred which generally represents the amount of consideration that is not probable of reversal. The Company generally provides limited warranties for work performed under its engineering and construction contracts. The warranty periods typically extend for a limited duration following substantial completion of the Company’s work on the project. Historically, warranty claims have not resulted in material costs incurred for which the Company was not compensated for by the customer. See Note 3- Revenue Accounting for Contracts for further discussion. Joint Ventures and VIEs As is common to the industry, we execute certain contracts jointly with third parties through various forms of joint ventures. 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. Many of these joint ventures are formed for a specific project. The assets of our joint ventures generally consist almost entirely of cash and receivables (representing amounts due from clients), and the liabilities of our joint ventures generally 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 or third-party debt or credit facilities. The debt held by the joint ventures is non-recourse to the general credit of Jacobs. The assets of a joint venture are restricted for use to the obligations of the particular joint venture and are not available for general operations of the Company. Our risk of loss on these arrangements is usually shared with our partners. The liability of each partner is usually joint and several, which means that each partner may become liable for the entire risk of loss on the project. Furthermore, on some of our projects, the Company has granted guarantees which may encumber both our contracting subsidiary company and the Company for the entire risk of loss on the project. The Company is unable to estimate the maximum potential amount of future payments that we could be required to make under outstanding performance guarantees related to joint venture projects due to a number of factors, including but not limited to, the nature and extent of any contractual defaults by our joint venture partners, resource availability, potential performance delays caused by the defaults, the location of the projects, and the terms of the related contracts. See Note 18 - Contractual Guarantees, Litigation, Investigations and Insurance for further discussion. Most of the joint ventures are deemed to be variable interest entities (“VIE”) because they lack sufficient equity to finance the activities of the joint venture. The Company uses a qualitative approach to determine if the Company is the primary beneficiary of the VIE, which considers factors that indicate a party has the power to direct the activities that most significantly impact the joint venture’s economic performance. These factors include the composition of the governing board, how board decisions are approved, the powers granted to the operational manager(s) and partner that holds that position(s), and to a certain extent, the partner’s economic interest in the joint venture. The Company analyzes each joint venture initially to determine if it should be consolidated or unconsolidated. • Consolidated if the Company is the primary beneficiary of a VIE or holds the majority of voting interests of a non-VIE (and no significant participative rights are available to the other partners). • Unconsolidated if the Company is not the primary beneficiary of a VIE or does not hold the majority of voting interest of a non-VIE. Our unconsolidated joint ventures (including equity method investments) are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the investment might not be recoverable, and impairment losses are recognized for such investments if there is a decline in fair value below carrying value that is considered to be other-than-temporary. See Note 8- Joint Ventures, VIEs and Other Investments for further discussion. 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. The net carrying amounts of cash and cash equivalents, trade receivables and payables and short-term debt approximate fair value due to the short-term nature of these instruments. See Note 9- Borrowings for a discussion of the fair value of long-term debt. Certain other assets and liabilities, such as forward contracts and interest rate swap agreements we purchased as cash-flow hedges discussed in Note 17 - Commitments and Contingencies and Derivative Financial Instruments are required to be carried in our Consolidated Financial Statements at Fair Value. The fair value of the Company’s reporting units (used for purposes of determining whether there is an impairment of the carrying value of goodwill) is determined using an income and market approach. Both approaches require us to make certain estimates and judgments. Under the income approach, fair value is determined by using the discounted cash flows of our reporting units. Under the market approach, the fair values of our reporting units are determined by reference to guideline companies that are reasonably comparable to our reporting units; the fair values are estimated based on the valuation multiples of earnings before taxes, interest, depreciation and amortization associated with the guideline companies. In assessing whether the carrying value of goodwill has been impaired, we utilize the results of both valuation techniques and consider the range of fair values indicated. With respect to equity-based compensation (i.e., share-based payments), we estimate the fair value of stock options granted to employees and directors using the Black-Scholes option-pricing model. Like all option-pricing models, the Black-Scholes model requires the use of subjective assumptions including (i) the expected volatility of the market price of the underlying stock, and (ii) the expected term of the award, among others. Accordingly, changes in assumptions and any subsequent adjustments to those assumptions can cause different fair values to be assigned to our future stock option awards. For restricted stock awards (including restricted stock units) containing market conditions, compensation expense is based on the fair value of such awards using a Monte Carlo simulation. For restricted stock awards (including restricted stock units) containing service and performance conditions, fair value is based on the closing stock price on the date of grant, adjusted for the expected level of achievement for any performance conditions. The fair values of the assets owned by the various pension plans that the Company sponsors are determined based on the type of asset, consistent with U.S. GAAP. Equity securities are valued by using market observable data such as quoted prices. Publicly traded corporate equity securities are valued at the last reported sale price on the last business day of the year. Securities not traded on the last business day are valued at the last reported bid price. Fixed income investment funds categorized as Level 2 are valued by the trustee using pricing models that use verifiable observable market data (e.g., interest rates and yield curves observable at commonly quoted intervals), bids provided by brokers or dealers, or quoted prices of securities with similar characteristics. Real estate consists primarily of common or collective trusts, with underlying investments in real estate. These investments are valued using the best information available, including quoted market price, market prices for similar assets when available, internal cash flow estimates discounted at an appropriate interest rate, or independent appraisals, as appropriate. Management values insurance contracts and hedge funds using actuarial assumptions and certain values reported by fund managers. Fair value measurements relating to our business combinations are made primarily using Level 3 inputs including discounted cash flow and to the extent applicable, Monte Carlo simulation techniques. Fair value for the identified intangible assets is generally estimated using inputs primarily for the income approach using the multiple period excess earnings method and the relief from royalties method. The significant assumptions used in estimating fair value include (i) revenue projections of the business, including profitability, (ii) attrition rates and (iii) the estimated discount rate that reflects the level of risk associated with receiving future cash flows. 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. The fair value of the contingent consideration is estimated using a Monte Carlo simulation and the significant assumptions used include projections of revenues and probabilities of meeting those projections. Key inputs to the valuation of the noncontrolling interests include projected cash flows and the expected volatility associated with those cash flows. The fair values for the asset groups relating to the impairment assessment of long-lived assets (see Note 10, Leases ) were estimated primarily using discounted cash flow models (income approach) with Level 3 inputs. The significant assumptions used in estimating fair value include the expected downtime prior to the commencement of future subleases, projected sublease income over the remaining lease periods and discount rates that reflects the level of risk associated with receiving future cash flows. The methodologies described above and elsewhere in these Notes to Consolidated Financial Statements may produce a fair value measure that may not be indicative of net realizable value or reflective of future fair values. Furthermore, while the Company believes Level 3 valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement. Cash Equivalents We consider all highly liquid investments with original maturities of less than three months to be cash equivalents. Cash equivalents at September 29, 2023 and September 30, 2022 consisted primarily of money market mutual funds and overnight bank deposits. Receivables, Contract Assets and Contract Liabilities Receivables include amounts billed, net and unbilled receivables. 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, which represent an unconditional right to payment subject only to the passage of time in connection with our client contracts, are reclassified to amounts billed when they are billed under the terms of the contract. We anticipate that substantially all of such unbilled amounts will be billed and collected over the next twelve months. Contract assets represent unbilled amounts where the right to payment is subject to more than merely the passage of time and includes performance-based incentives and services provided ahead of agreed contractual milestones. Contract assets are transferred to unbilled receivables when the right to consideration becomes unconditional and are transferred to amounts billed upon invoicing. Contract liabilities represent amounts billed to clients in excess of revenue recognized to date. We anticipate that substantially all such amounts will be earned over the next twelve months. Property, Equipment, and Improvements Property, equipment and improvements are carried at cost, and are shown net of accumulated depreciation and amortization in the accompanying Consolidated Balance Sheets. Depreciation and amortization is computed primarily by using the straight-line method over the estimated useful lives of the assets. The cost of leasehold improvements is amortized using the straight-line method over the lesser of the estimated useful life of the asset or the remaining term of the related lease. Estimated useful lives range from 20 to 40 years for buildings, from 3 to 10 years for equipment and from 2 to 20 years for leasehold improvements. Goodwill and Other Intangible Assets Goodwill represents the excess of the cost of an acquired business over the fair value of the net tangible and intangible assets acquired. Goodwill and intangible assets with indefinite lives are not amortized; instead, on an annual basis we test goodwill and intangible assets with indefinite lives for possible impairment. Intangible assets with finite lives are amortized on a straight-line basis over the useful lives of those assets. For purposes of impairment testing, goodwill is assigned to the applicable reporting units based on the current reporting structure. We have determined that our operating segments are also our reporting units based on management’s conclusion that the components comprising each of our operating segments share similar economic characteristics and meet the aggregation criteria in accordance with ASC 350. We perform our annual goodwill impairment assessment as of the first day of the fourth fiscal quarter each year. We begin with the qualitative assessment of whether it is more likely than not that a reporting unit’s fair value is less than its carrying value before applying the quantitative assessment described below. If it is determined through the evaluation of events or circumstances that the carrying value may not be recoverable, the Company then compares the fair value of the related reporting unit with its carrying amount. If the carrying amount of a reporting unit exceeds its fair value, an impairment loss is recognized . For the 2023 fiscal year, in connection with the separation activities of the CMS business and part of our DVS business, we performed a quantitative impairment test of the CMS and DVS reporting units and determined that the fair value of these reporting units exceeded their respective carrying value. For the remaining reporting units, we determined that the fair values significantly exceeded their carrying values and an analysis beyond the qualitative level was not considered necessary. Impairment of Long-Lived Assets Our long-lived assets other than goodwill principally consist of right-of-use (ROU) lease assets, property, equipment and improvements, and finite-lived intangible assets. These long-lived assets are evaluated for impairment for each of our asset groups in accordance with ASC 360 by first identifying whether indicators of impairment exist. If such indicators are present, we assess long-lived asset groups for recoverability based on estimated future undiscounted cash flows. For asset groups where the recoverability test fails, the fair value of each asset group is then estimated and compared to its carrying amount. An impairment loss is recognized for the amount by which an asset group’s carrying value exceeds its fair value. Foreign Currencies In preparing our Consolidated Financial Statements, it is necessary to translate the financial statements of our subsidiaries operating outside the U.S., which are denominated in currencies other than the U.S. dollar, into the U.S. dollar. In accordance with U.S. GAAP, revenues and expenses of operations outside the U.S. are translated into U.S. dollars using weighted-average exchange rates for the applicable periods being translated while the assets and liabilities of operations outside the U.S. are generally translated into U.S. dollars using period-end exchange rates. The net effect of foreign currency translation adjustments is included in stockholders’ equity as a component of accumulated other comprehensive income (loss) in the accompanying Consolidated Balance Sheets. Share-Based Payments We measure the value of services received from employees and directors in exchange for an award of an equity instrument based on the grant-date fair value of the award. The fair value is recognized as a non-cash cost on a straight-line basis over the period the individual provides services, which is typically the vesting period of the award with the exception of awards containing an internal performance measure, such as Earnings Per Share growth and Return on Invested Capital, which is recognized on a straight-line basis over the vesting period subject to the probability of meeting the performance requirements and adjusted for the number of shares expected to be earned. The cost of these awards is recorded in selling, general and administrative expense in the accompanying Consolidated Statements of Earnings. Concentrations of Credit Risk Our cash balances and cash equivalents are maintained in accounts held by major banks and financial institutions located in North America, South America, Europe, the Middle East, India, Australia, Africa and Asia. In the normal course of business, and consistent with industry practices, we grant credit to our clients without requiring collateral. Concentrations of credit risk is the risk that, if we extend a significant amount of credit to clients in a specific geographic area or industry, we may experience disproportionately high levels of default if those clients are adversely affected by factors particular to their geographic area or industry. Concentrations of credit risk relative to trade receivables are limited due to our diverse client base, which includes the U.S. federal government and multi-national corporations operating in a broad range of industries and geographic areas. Additionally, in order to mitigate credit risk, we continually evaluate the credit worthiness of our major commercial clients. Leases The Company accounts for its leases in accordance with ASC 842, Leases ("ASC 842") . ASC 842 requires lessees to recognize assets and liabilities for most leases. The Company determines if an arrangement is a lease at contract inception. A lease exists when a contract conveys to the customer the right to control the use of an identified asset for a period of time in exchange for consideration. The definition of a lease embodies two conditions: (1) there is an identified asset in the contract, and (2) the customer has the right to control the use of the identified asset. Lessees are required to classify leases as either finance or operating leases. This classification will determine whether lease expense is recognized based on an effective interest method or on a straight-line basis over the term of the lease. ASC 842 provided several optional practical expedients for use in transition to and ongoing application of ASC 842. The Company elected to utilize the package of practical expedients in ASC 842-10-65-1(f) that, upon adoption of ASC 842, allows entities to (1) not reassess whether any expired or existing contracts are or contain leases, (2) retain the classification of leases (e.g., operating or finance lease) existing as of the date of adoption and (3) not reassess initial direct costs for any existing leases. The Company did not elect the practical expedient pertaining to the use of hindsight. The Company elected to utilize the practical expedient in ASC 842-10-15-37 in which the Company has chosen to account for each separate lease component of a contract and its associated non-lease components as a single lease component. The Company’s right-of use assets and lease liabilities relate to real estate, project assets used in connection with long-term construction contracts, IT assets and vehicles. The Company’s leases have remaining lease terms of less than one year to twenty years. The Company’s lease obligations are primarily for the use of office space and are primarily operating leases. Certain of the Company’s leases contain renewal, extension, or termination options. The Company assesses each option on an individual basis and will only include options reasonably certain of exercise in the lease term. The Company generally considers the base term to be the term provided in the contract. None of the Company’s lease agreements contain material options to purchase the leased property, material residual value guarantees, or material restrictions or covenants. Long-term project asset and vehicle leases (leases with terms greater than twelve months), along with all real estate and IT asset leases, are recorded on the consolidated balance sheet at the present value of the minimum lease payments not yet paid. Because the Company primarily acts as a lessee and the rates implicit in its leases are not readily determinable, the Company generally uses its incremental borrowing rate on the lease commencement date to calculate the present value of future lease payments. Certain leases include payments that are based solely on an index or rate. These variable lease payments are included in the calculation of the ROU asset and lease liability and are initially measured using the index or rate at the lease commencement date. Other variable lease payments, such as payments based on use and for property taxes, insurance, or common area maintenance that are based on actual assessments are excluded from the ROU asset and lease liability and are expensed as incurred. In addition to the present value of the future lease payments, the calculation of the ROU asset also includes any deferred rent, lease prepayments and initial direct costs of obtaining the lease, such as commissions. Certain lease contracts contain non-lease components such as maintenance and utilities. The Company has made an accounting policy election, as allowed under ASC 842-10-15-37 and discussed above, to capitalize both the lease component and non-lease components of its contracts as a single lease component for all of its right-of-use assets. Short-term project asset and vehicle leases (project asset and vehicle leases with an initial term of twelve months or less or leases that are cancellable by the lessee and lessor without significant penalties) are not recorded on the consolidated balance sheet and are expensed on a straight-line basis over the lease term. The majority of the Company’s short-term leases relate to equipment used on construction projects. These leases are entered into at agreed upon hourly, daily, weekly or monthly rental rates for an unspecified duration and typically have a termination for convenience provision. Such equipment leases are considered short-term in nature unless it is reasonably certain that the equipment will be leased for a term greater than twelve months. Pensions We use certain assumptions and estimates in order to calculate periodic pension cost and the value of the assets and liabilities of our pension plans. These assumptions involve discount rates, investment returns, and projected salary increases, among others. Changes in the actuarial assumptions may have a material effect on the plans’ liabilities and the projected pension expense. We use a corridor approach to amortize actuarial gains and losses. Under this approach, net gains or losses in excess of ten percent of the larger of the pension benefit obligation or the market-related value of the assets are amortized on a straight-line basis. The period of amortization is the average remaining service of active participants who are expected to receive benefits under certain plans and the average remaining future lifetime of plan participants for certain plans. We measure our defined benefit plan assets and obligations as of the end of the month closest to their fiscal year end, which is September 30, 2023 as the alternative measurement date in accordance with FASB guidance ASU 2015-04, Compensation Retirement Benefit (Topic 715): Practical Expedient for the Measurement Date of an Employer’s Defined Benefit Obligation and Plan Asset . This guidance allows employers with fiscal year ends that do not coincide with a calendar month end to make an accounting policy election to measure defined benefit plan assets and obligations as of the end of the month closest to their fiscal year end. Redeemable Noncontrolling Interests In connection with the PA Consulting investment in March 2021, the Company recorded redeemable noncontrolling interests, representing the interest holders' 35% equity interest in the form of preferred and common shares of PA Consulting. The preferred shares are entitled to a cumulative annual compounding 12% dividend based on the outstanding preferred share s

Revenue Accounting for Contract

Revenue Accounting for Contracts	12 Months Ended
	Sep. 29, 2023
Revenue from Contract with Customer [Abstract]
Revenue Accounting for Contracts	Revenue Accounting for Contracts Disaggregation of Revenues Our revenues are principally derived from contracts to provide a diverse range of technical, professional, and construction services to a large number of industrial, commercial, and governmental clients. We provide a broad range of 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. Our contracts are with many different customers in numerous industries. Refer to Note 19 - Segment Information for additional information on how we disaggregate our revenues by reportable segment. The following table further disaggregates our revenue by geographic area for the years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 Revenues: United States $ 10,963,072 $ 9,875,252 $ 9,671,281 Europe 3,598,140 3,488,317 3,140,114 Canada 268,466 269,386 227,692 Asia 135,359 140,663 114,118 India 164,212 114,235 70,772 Australia and New Zealand 696,870 706,283 647,866 Middle East and Africa 526,295 328,689 220,789 Total $ 16,352,414 $ 14,922,825 $ 14,092,632 The following table presents the revenues earned directly or indirectly from the U.S. federal government and its agencies, expressed as a percentage of total revenues: For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 31% 31% 33% Contract Liabilities Contract liabilities represent amounts billed to clients in excess of revenue recognized to date. Revenue recognized for the year ended September 29, 2023 that was included in the contract liability balance on September 30, 2022 was $504 million. Revenue recognized for the year ended September 30, 2022 that was included in the contract liability balance on October 1, 2021 was $422 million. Remaining Performance Obligations The Company’s remaining performance obligations as of September 29, 2023 represent a measure of the total dollar value of work to be performed on contracts awarded and in progress. The Company had approximately $18.7 billion in remaining performance obligations as of September 29, 2023. The Company expects to recognize 53% of our remaining performance obligations within the next twelve months and the remaining 47% thereafter. The majority of the remaining performance obligations after the first twelve months are expected to be recognized over a four-year period. Although remaining performance obligations reflect business that is considered to be firm, cancellations, scope adjustments, foreign currency exchange fluctuations or project deferrals may occur that impact their volume or the expected timing of their recognition. Remaining performance obligations are adjusted to reflect any known project cancellations, revisions to project scope and cost, foreign currency exchange fluctuations and project deferrals, as appropriate.

Earnings Per Share and Certain

Earnings Per Share and Certain Related Information	12 Months Ended
	Sep. 29, 2023
Earnings Per Share Reconciliation [Abstract]
Earnings Per Share and Certain Related Information	Earnings Per Share and Certain Related InformationBasic and Diluted Earnings Per Share 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 and the preferred redeemable noncontrolling interests redemption value adjustments associated with the PA Consulting transaction in fiscal 2021 and in fiscal 2023. The following table reconciles the denominator used to compute basic EPS to the denominator used to compute diluted EPS for the years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 Numerator for Basic and Diluted EPS: Net earnings attributable to Jacobs from continuing operations $ 666,619 $ 644,071 $ 467,022 Preferred Redeemable Noncontrolling interests redemption value adjustment (See Note 14- PA Consulting Business Combination ) 8,340 — (57,307) Net earnings from continuing operations allocated to common stock for EPS calculation $ 674,959 $ 644,071 $ 409,715 Net (loss) earnings from discontinued operations allocated to common stock for EPS calculation $ (842) $ (32) $ 10,008 Net earnings allocated to common stock for EPS calculation $ 674,117 $ 644,039 $ 419,723 Denominator for Basic and Diluted EPS: Shares used for calculating basic EPS attributable to common stock 126,607 128,665 130,194 Effect of dilutive securities: Stock compensation plans 607 780 1,080 Shares used for calculating diluted EPS attributable to common stock 127,214 129,445 131,274 Net Earnings Per Share: Basic Net Earnings from Continuing Operations Per Share $ 5.33 $ 5.01 $ 3.15 Basic Net (Loss) Earnings from Discontinued Operations Per Share $ (0.01) $ — $ 0.08 Basic Earnings Per Share: $ 5.32 $ 5.01 $ 3.22 Diluted Net Earnings from Continuing Operations Per Share $ 5.31 $ 4.98 $ 3.12 Diluted Net (Loss) Earnings from Discontinued Operations Per Share $ (0.01) $ — $ 0.08 Diluted Earnings Per Share: $ 5.30 $ 4.98 $ 3.20 Note: Earnings per share amounts may not add due to rounding Share Repurchases On January 16, 2020, the Company's Board of Directors authorized a share repurchase program of up to $1.0 billion of the Company's common stock (the "2020 Repurchase Authorization"). In the fourth quarter of fiscal 2021 the Company launched an accelerated share repurchase program by advancing $250 million to a financial institution in a privately negotiated transaction, with final non-cash settlement on the program during the first quarter of fiscal 2022 of 342,054 shares. The 2020 Repurchase Authorization expired on January 15, 2023. On January 25, 2023, the Company's Board of Directors authorized an incremental share repurchase program of up to $1.0 billion of the Company's common stock, to expire on January 25, 2026 (the "2023 Repurchase Authorization"). The following table summarizes repurchase activity under the 2020 Repurchase Authorization during fiscal 2023 through expiration during the second fiscal quarter of 2023: Amount Authorized Average Price Per Share (1) Shares Repurchased Total Shares Retired $1,000,000,000 $113.56 1,237,688 1,237,688 (1) Includes commissions paid and excise tax due under the Inflation Reduction Act of 2022 and calculated at the average price per share. The following table summarizes the activity under the 2023 Repurchase Authorization during fiscal 2023: Amount Authorized Average Price Per Share (1) Shares Repurchased Total Shares Retired $1,000,000,000 $115.04 1,088,012 1,088,012 (1) Includes commissions paid and excise tax due under the Inflation Reduction Act of 2022 and calculated at the average price per share. As of September 29, 2023, the Company has $874.8 million remaining under the 2023 Repurchase Authorization. Our share repurchase programs do not obligate the Company to purchase any shares. Share repurchases may be executed through various means including, without limitation, accelerated share repurchases, open market transactions, privately negotiated transactions, purchases pursuant to a Rule 10b5-1 plan or otherwise. The authorization for the share repurchase programs may be terminated, increased or decreased by the Company’s Board of Directors in its discretion at any time. The timing, amount and manner of share repurchases may depend upon market conditions and economic circumstances, availability of investment opportunities, the availability and costs of financing, currency fluctuations, the market price of the Company's common stock, other uses of capital and other factors. Common and Preferred Stock Jacobs is authorized to issue two classes of capital stock designated “common stock” and “preferred stock” (each has a par value of $1.00 per share). The preferred stock may be issued in one or more series. The number of shares to be included in a series as well as each series’ designation, relative powers, dividend and other preferences, rights and qualifications, redemption provisions and restrictions are to be fixed by the Company’s Board of Directors at the time each series is issued. Except as may be provided by the Company’s Board of Directors in a preferred stock designation, or otherwise provided for by statute, the holders of shares of common stock have the exclusive right to vote for the election of directors and on all other matters requiring stockholder action. The holders of shares of common stock are entitled to dividends if and when declared by the Company’s Board of Directors from whatever assets are legally available for that purpose. Dividends On September 28, 2023, the Company’s Board of Directors declared a quarterly dividend of $0.26 per share of the Company’s common stock, which was paid on November 9, 2023, to shareholders of record on the close of business on October 27, 2023. Future dividend declarations are subject to review and approval by the Company’s Board of Directors. Dividends paid through September 29, 2023 and the preceding fiscal year are as follows: Declaration Date Record Date Payment Date Cash Amount (per share) July 6, 2023 July 28, 2023 August 25, 2023 $0.26 April 27, 2023 May 26, 2023 June 23, 2023 $0.26 January 25, 2023 February 24, 2023 March 24, 2023 $0.26 September 15, 2022 September 30, 2022 October 28, 2022 $0.23 July 13, 2022 July 29, 2022 August 26, 2022 $0.23 April 28, 2022 May 27, 2022 June 24, 2022 $0.23 January 26, 2022 February 25, 2022 March 25, 2022 $0.23

Goodwill and Intangibles

Goodwill and Intangibles	12 Months Ended
	Sep. 29, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangibles	Goodwill and Intangibles As a result of the formation of our new Divergent Solutions operating segment beginning in the first quarter of fiscal 2023, the historical carrying value of a portion of goodwill has been reallocated to this segment based on a relative fair value basis. The carrying value of goodwill associated with continuing operations and appearing in the accompanying Consolidated Balance Sheets September 29, 2023 and September 30, 2022 was as follows (in thousands): Critical Mission Solutions People & Places Solutions Divergent Solutions PA Consulting Total Balance September 30, 2022 $ 2,251,724 $ 3,196,796 $ 576,986 $ 1,159,152 $ 7,184,658 Acquired — — — 11,956 11,956 Post-Acquisition Adjustments — (138) — 877 739 Foreign currency translation and other (6,739) 11,535 18,726 122,651 146,173 Balance September 29, 2023 $ 2,244,985 $ 3,208,193 $ 595,712 $ 1,294,636 $ 7,343,526 The following table provides certain information related to the Company’s acquired intangibles in the accompanying Consolidated Balance Sheets for the year ended September 29, 2023 (in thousands): Customer Relationships, Contracts and Backlog Developed Technology Trade Names Total Balances, September 30, 2022 $ 1,136,438 $ 88,931 $ 168,683 $ 1,394,052 Amortization (177,821) (15,695) (10,390) (203,906) Acquired 5,537 — — 5,537 Post Acquisition Adjustments (1,409) — — (1,409) Foreign currency translation and other 59,656 1,555 16,458 77,669 Balances, September 29, 2023 $ 1,022,401 $ 74,791 $ 174,751 $ 1,271,943 Weighted Average Amortization Period (years) 7 6 17 8 The weighted average amortization period includes the effects of foreign currency translation. The following table presents estimated amortization expense of intangible assets for fiscal 2024 and for the succeeding years. Fiscal Year (in millions) 2024 $ 203.3 2025 202.7 2026 180.1 2027 148.7 2028 140.8 Thereafter 396.3 Total $ 1,271.9

Other Financial Information

Other Financial Information	12 Months Ended
	Sep. 29, 2023
Other Financial Information [Abstract]
Other Financial Information	Other Financial Information Receivables and contract assets The following table presents the components of receivables and contract assets appearing in the accompanying Consolidated Balance Sheets at September 29, 2023 and September 30, 2022 as well as certain other related information (in thousands): September 29, 2023 September 30, 2022 Components of receivables: Amounts billed, net $ 1,457,333 $ 1,400,088 Unbilled receivables and other 1,442,486 1,523,249 Contract assets 658,987 482,044 Total receivables and contract assets, net $ 3,558,806 $ 3,405,381 Other information about receivables: Amounts due from the United States federal government included above, net of contract liabilities $ 802,566 $ 749,323 Property, Equipment and Improvements, Net The following table presents the components of our property, equipment and improvements, net at September 29, 2023 and September 30, 2022 (in thousands): September 29, 2023 September 30, 2022 Land $ 477 $ 478 Buildings 62,380 46,244 Equipment 719,167 643,805 Leasehold improvements 190,257 179,187 Construction in progress 28,355 34,880 1,000,636 904,594 Accumulated depreciation and amortization (643,604) (557,918) $ 357,032 $ 346,676 The following table presents our property, equipment and improvements, net by geographic area for the years ended September 29, 2023 and September 30, 2022 (in thousands): For the Years Ended September 29, 2023 September 30, 2022 Property, equipment and improvements, net: United States $ 203,358 $ 226,639 Europe 108,587 87,331 Canada 4,812 5,210 Asia 3,775 2,578 India 12,583 9,659 Australia and New Zealand 15,406 13,211 Middle East and Africa 8,511 2,048 Total $ 357,032 $ 346,676 See discussion in Note 10- Leases , regarding impairments recorded in the years ended September 29, 2023 and September 30, 2022 relating to the Company's real estate lease portfolio and related property, equipment and improvements, net. Accrued Liabilities The following table presents the components of accrued liabilities shown in the accompanying Consolidated Balance Sheets at September 29, 2023 and September 30, 2022 (in thousands): September 29, 2023 September 30, 2022 Accrued payroll and related liabilities $ 842,815 $ 947,547 Project-related accruals 27,814 28,178 Non project-related accruals and other 222,938 279,062 Insurance liabilities 63,536 63,183 Sales and other similar taxes 110,199 93,500 Dividends payable 34,342 30,292 Total $ 1,301,644 $ 1,441,762 Accumulated Other Comprehensive Income (Loss) The following table presents the Company's roll forward of accumulated income (loss) after-tax for the years ended September 29, 2023 and September 30, 2022 (in thousands): Change in Pension and Retiree Medical Plan Liabilities Foreign Currency Translation Adjustment (1) Gain/(Loss) on Cash Flow Hedges (2) Total Balance at October 1, 2021 $ (394,561) $ (407,240) $ 7,359 $ (794,442) Other comprehensive income (loss) 87,034 (378,800) 108,555 (183,211) Reclassifications from other comprehensive income (loss) 132 — 2,391 2,523 Balance at September 30, 2022 $ (307,395) $ (786,040) $ 118,305 $ (975,130) Other comprehensive income (loss) (18,485) 150,103 15,006 146,624 Reclassifications from other comprehensive income (loss) 188 — (29,636) (29,448) Balance at September 29, 2023 $ (325,692) $ (635,937) $ 103,675 $ (857,954) (1) Included in the overall foreign currency translation adjustment for the years ended September 29, 2023 and September 30, 2022 is $(67.5) million and $144.3 million, respectively, in unrealized gains (losses) on long-term foreign currency denominated intercompany loans not anticipated to be settled in the foreseeable future. (2) Included in the Company’s cumulative net unrealized gains from interest rate swaps recorded in accumulated other comprehensive income as of September 29, 2023 were approximately $22.6 million in unrealized gains, net of taxes, which are expected to be realized in earnings during the twelve months subsequent to September 29, 2023.

Income Taxes

Income Taxes	12 Months Ended
	Sep. 29, 2023
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The following table presents the components of our consolidated income taxes for continuing operations for years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 Current income tax (benefit) expense from continuing operations: Federal $ 70,895 $ (35,291) $ 91,313 State 31,046 4,526 30,886 Foreign 171,055 79,822 38,959 Total current tax expense from continuing operations 272,996 49,057 161,158 Deferred income tax expense (benefit) from continuing operations: Federal (29,748) 56,526 35,109 State 2,448 17,178 21,826 Foreign (49,515) 38,142 56,688 Total deferred tax expense from continuing operations (76,815) 111,846 113,623 Consolidated income tax expense from continuing operations $ 196,181 $ 160,903 $ 274,781 Deferred taxes reflect the tax effects of temporary differences between the amounts recorded as assets and liabilities for financial reporting purposes and the comparable amounts recorded for income tax purposes. Deferred tax assets and liabilities are measured using the enacted tax rates and laws that will be in effect when the differences are expected to reverse. The following table presents the components of our net deferred tax (liabilities) assets at September 29, 2023 and September 30, 2022 (in thousands): September 29, 2023 September 30, 2022 Deferred tax assets: Other employee benefit plans $ 136,648 $ 138,897 Net operating losses 269,412 132,999 Foreign tax credit 68,874 83,697 Lease liability 126,893 138,635 Unrealized foreign exchange loss 32,090 46,005 Other 16,996 11,831 Valuation allowance (200,389) (113,483) Gross deferred tax assets 450,524 438,581 Deferred tax liabilities: Depreciation and amortization (394,332) (431,946) Lease right of use asset (62,640) (71,658) Partnership investment (61,614) (52,787) Hedge investments (34,045) (38,994) Unrealized foreign exchange gain (31,205) (45,754) Other (34,715) (35,039) Gross deferred tax liabilities (618,551) (676,178) Net deferred tax liabilities $ (168,027) $ (237,597) Certain amounts have been reclassified to conform to current year presentation. A valuation allowance is recorded to reduce deferred tax assets to the amount that is more likely than not to be realized based on an assessment of positive and negative evidence, including estimates of future taxable income necessary to realize future deductible amounts. The valuation allowance was $200.4 million at September 29, 2023 and $113.5 million at September 30, 2022. This $86.9 million change in the valuation allowance is attributable primarily to the recording of a $110.0 million valuation allowance against a net operating loss incurred in Australia as a result of the Legacy CH2M Matter settlement offset by the recording of a net operating loss deferred tax asset, a $14.7 million valuation allowance release due to the change in the realizability of foreign tax credits, and a decrease of $8.4 million related to various other items At September 29, 2023 and September 30, 2022, the domestic and international net operating loss (NOL) carryforwards totaled $964.5 million and $491.3 million, resulting in an NOL deferred tax asset of $269.4 million and $133.0 million, respectively. The Company's net operating losses have various expiration periods between 2024 and indefinite periods. At September 29, 2023, the Company has foreign tax credit carryforwards of $68.9 million, which has a partial valuation allowance of $32.2 million with $29.1 million expected to expire in 2024 and the remaining by 2033. The following table presents the income tax benefits from continuing operations realized from the exercise of non-qualified stock options and disqualifying dispositions of stock sold under our employee stock purchase plans for the years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in millions): For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 $ 3.9 $ 2.2 $ 9.9 The following table reconciles total income tax expense from continuing operations using the statutory U.S. federal income tax rate to the consolidated income tax expense for continuing operations shown in the accompanying Consolidated Statements of Earnings for the years ended September 29, 2023, September 30, 2022 and October 1, 2021 (dollars in thousands): For the Years Ended September 29, 2023 % September 30, 2022 % October 1, 2021 % Statutory amount $ 192,503 21.0 % $ 184,033 21.0 % $ 146,078 21.0 % State taxes, net of the federal benefit 23,901 2.6 % 19,316 2.2 % 14,564 2.1 % Exclusion of tax on non-controlling interests (6,578) (0.7) % (7,533) (0.9) % (7,999) (1.1) % Foreign: Difference in tax rates of foreign operations 7,166 0.8 % (2,516) (0.3) % 3,684 0.5 % Expense/(benefit) from foreign valuation allowance change (1,305) (0.1) % 2,982 0.3 % 2,148 0.3 % Nondeductible compensation — — % — — % 48,727 7.0 % U.S. tax cost (benefit) of foreign operations 78,216 8.5 % 48,843 5.6 % 35,228 5.1 % Tax differential on foreign earnings 84,077 9.2 % 49,309 5.6 % 89,787 12.9 % Foreign tax credits (46,530) (5.1) % (33,734) (3.8) % (25,230) (3.6) % Tax Rate Change (9,913) (1.1) % 3,210 0.4 % 25,588 3.7 % Valuation allowance (7,169) (0.8) % (59,121) (6.7) % 38,928 5.6 % Uncertain tax positions (38,844) (4.2) % (1,439) (0.2) % 978 0.1 % Other items: Energy efficient commercial buildings deduction 736 0.1 % (2,681) (0.3) % (3,760) (0.5) % Disallowed officer compensation 7,081 0.8 % 6,034 0.7 % 6,689 1.0 % Stock compensation (3,896) (0.4) % (2,168) (0.2) % (9,946) (1.4) % Other items – net 813 0.1 % 5,677 0.6 % (896) (0.1) % Total other items 4,734 0.5 % 6,862 0.8 % (7,913) (1.1) % Taxes on income from continuing operations $ 196,181 21.4 % $ 160,903 18.4 % $ 274,781 39.5 % The following table presents income tax payments, net made during the years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in millions): September 29, 2023 September 30, 2022 October 1, 2021 $ 204.2 $ 113.9 $ 75.6 The following table presents the components of our consolidated earnings from continuing operations before taxes for the years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 United States earnings $ 388,999 $ 415,673 $ 634,820 Foreign earnings 527,680 460,674 60,782 $ 916,679 $ 876,347 $ 695,602 We do not record a deferred tax liability for unremitted earnings of our foreign subsidiaries to the extent that the earnings meet the indefinite reversal criteria. This criteria is met if the foreign subsidiary has invested, or will invest, the earnings indefinitely. The decision as to the amount of unremitted earnings that we intend to maintain in non-U.S. subsidiaries considers items including, but not limited to, forecasts and budgets of financial needs of cash for working capital, liquidity plans, and expected cash requirements in the U.S. As of September 29, 2023, we had not recognized a deferred tax liability on approximately $179.5 million of undistributed earnings for certain foreign subsidiaries, because these earnings are intended to be indefinitely reinvested. If such earnings were distributed, some countries may impose additional taxes. The unrecognized deferred tax liability (the amount payable if distributed) is approximately $13.7 million. The Company has various long-term foreign currency denominated intercompany loans not anticipated to be settled in the foreseeable future. Due to the long-term nature of the loan, the foreign currency gains (losses) resulting from re-measurement are generally recognized as a component of accumulated other comprehensive income (loss). Deferred taxes are not provided on the unrealized gains of approximately $104.7 million because the intercompany loans and the related gains (losses) on the loans denominated in the functional currencies of the subsidiaries are viewed as a part of the Company’s net investment in the subsidiaries and are considered to be indefinitely reinvested by the Company. The unrecognized deferred taxes are approximately $25.7 million as of September 29, 2023. The Company accounts for unrecognized tax benefits in accordance with ASC Topic 740, Income Taxes . It accounts for interest and penalties on unrecognized tax benefits as interest and penalties reported above the line (i.e., not as part of income tax expense). The Company’s liability for gross unrecognized tax benefits was $33.5 million and $81.9 million at September 29, 2023 and September 30, 2022, respectively, after ASU 2013-11 netting of $5.3 million and $7.0 million, respectively. The main driver of the current year decrease relates to $51.4 million of uncertain tax positions in the U.S. that were effectively settled, which includes a $7.2 million temporary item with no rate impact. At September 29, 2023 and September 30, 2022, if recognized, $33.6 million and $73.5 million, respectively, would affect the Company’s consolidated effective income tax rate. The Company had $37.8 million and $43.5 million in accrued interest and penalties at September 29, 2023 and September 30, 2022, respectively. The Company estimates that, within twelve months, we may realize a decrease in our uncertain tax positions of approximately $11.1 million as a result of concluding various tax audits and closing tax years. In the normal course of business, the Company is subject to examination by taxing authorities worldwide, including such major jurisdictions as U.S., Australia, and the U.K. As of September 29, 2023, the Company’s FY 2019 through 2022 consolidated U.S. Federal income tax returns and the CH2M Hill Companies Ltd. FY 2009 through 2012 consolidated U.S. Federal income tax returns remain subject to examination. In Australia and the U.K., the consolidated federal tax returns for years 2018 through 2022 are subject to audit by the appropriate taxing authorities. Although the Company believes the reserves established for the tax positions are reasonable, the outcome of tax audits could be materially different, both favorably and unfavorably. The following table presents the reconciliation of the beginning and ending amount of unrecognized tax benefits, with StreetLight and PA Consulting related impacts added for the years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 Balance, beginning of year $ 88,893 $ 113,633 $ 102,484 Acquisitions/Divestitures — 192 7,639 Additions based on tax positions related to the current year 1,190 1,136 7,088 Additions for tax positions of prior years 2,537 1,207 1,711 Reductions for tax positions of prior years (53,854) (3,672) (4,851) Settlement — (23,603) (438) Balance, end of year $ 38,766 $ 88,893 $ 113,633 As further discussed in Note 14, PA Consulting Business Combination and Note 15, Other Business Combinations , the Company has made several acquisitions and a strategic investment, all of which were accounted for as stock purchases and the tax attributes of the net assets acquired were carried over, with the exception of Buffalo Group, which was treated as an asset acquisition and the net assets were stepped up to fair value.

Joint Ventures and VIE's and Ot

Joint Ventures and VIE's and Other Investments	12 Months Ended
	Sep. 29, 2023
Equity Method Investments and Joint Ventures [Abstract]
Joint Ventures and VIE's and Other Investments	Joint Ventures, VIEs and Other Investments For consolidated joint ventures, the entire amount of the revenue recognized for services performed and the costs associated with these services, including the services provided by the other joint venture partners, are included in the Company's results of operations. Likewise, the entire amount of each of the assets and liabilities are included in the Company’s consolidated balance sheet. There are no consolidated VIEs that have debt or credit facilities. Summary financial information of consolidated VIEs is as follows (in millions): September 29, 2023 September 30, 2022 Current assets $ 424.2 $ 353.9 Non-Current assets — — Total assets $ 424.2 $ 353.9 Current liabilities $ 279.8 $ 228.1 Total liabilities $ 279.8 $ 228.1 For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 Revenue $ 1,431.7 $ 1,253.8 $ 1,037.3 Direct cost of contracts (1,106.5) (985.5) (910.1) Gross profit 325.2 268.3 127.2 Net earnings $ 87.3 $ 92.3 $ 84.3 Unconsolidated joint ventures are accounted for under the equity method or proportionate consolidation. Proportionate consolidation is used for joint ventures that include unincorporated legal entities and activities of the joint venture are construction-related. For those joint ventures accounted for under proportionate consolidation, only the Company’s pro rata share of assets, liabilities, revenue, and costs are included in the Company’s balance sheet and results of operations. For the proportionate consolidated VIEs, the carrying value of assets and liabilities was $132.0 million and $128.9 million as of September 29, 2023, respectively, and $109.3 million and $129.2 million as of September 30, 2022, respectively. For those joint ventures accounted for under the equity method, the Company's investment balances for the joint venture is included in other noncurrent assets: miscellaneous on the balance sheet and the Company’s pro rata share of net income is included in revenue. In limited cases, there are basis differences between the equity in the joint venture and Jacobs' investment created when Jacobs purchased their share of the joint venture. These basis differences are amortized based on an internal allocation to underlying net assets, excluding allocations to goodwill. Our investments in equity method joint ventures on the Consolidated Balance Sheets as of September 29, 2023 and September 30, 2022 were a net asset of $49.6 million and $56.6 million, respectively. During the years ended September 29, 2023, September 30, 2022, and October 1, 2021, we recognized income from equity method joint ventures of $33.6 million, $36.5 million, and $60.9 million, respectively. Accounts receivable from unconsolidated joint ventures accounted for under the equity method is $16.1 million and $21.1 million as of September 29, 2023 and September 30, 2022, respectively. During the fiscal year ended October 1, 2021, the Company recorded other-than-temporary impairment charges on its equity method investment in AWE Management Ltd ("AWE"), in the amount of $38.5 million, which were included in miscellaneous income (expense), net in the consolidated statement of earnings. During fiscal year 2022, the contractual operating arrangement with UK Ministry of Defence ("MoD") was terminated which has resulted in the wind down and full impairment of the AWE Joint Venture with immaterial activity expected going forward. The Company held a cost method investment in C3.ai, Inc. ("C3") and in the first quarter of fiscal 2021, C3 completed an initial public offering and as a result the Company carried its investment in C3 at fair value, with changes reflected in net income as it is an investment in equity securities with a readily determinable fair value based on quoted market prices. During fiscal 2021 and subsequent to the IPO, the Company sold all shares owned in C3. Dividend income, unrealized gains and related realized gains on disposal of these shares of $49.6 million were recognized in miscellaneous income (expense), net, in the Consolidated Statement of Earnings for the year ended October 1, 2021.

Borrowings

Borrowings	12 Months Ended
	Sep. 29, 2023
Debt Disclosure [Abstract]
Borrowings	Borrowings The following table presents certain information regarding the Company’s long-term debt at September 29, 2023 and September 30, 2022 (dollars in thousands): Interest Rate Maturity September 29, 2023 September 30, 2022 Revolving Credit Facility Benchmark + applicable margin (1) (2) February 2028 $ 10,000 $ 1,105,294 2021 Term Loan Facility - USD Portion Benchmark + applicable margin (1) (3) February 2026 120,000 200,000 2021 Term Loan Facility - GBP Portion Benchmark + applicable margin (1) (3) September 2025 794,170 723,580 2020 Term Loan Facility Benchmark + applicable margin (1) (4) March 2025 (7) 854,246 882,263 Fixed-rate: 5.9% Bonds, due 2033 5.9% (5) March 2033 500,000 — 6.35% Bonds, due 2028 6.35% August 2028 600,000 — Senior Notes, Series A 4.27% May 2025 (6) — 190,000 Senior Notes, Series B 4.42% May 2028 (6) — 180,000 Senior Notes, Series C 4.52% May 2030 (6) — 130,000 Less: Current Portion (7) (51,773) (50,415) Less: Deferred Financing Fees (13,172) (3,466) Total Long-term debt, net $ 2,813,471 $ 3,357,256 (1) During the year ended September 29, 2023, the aggregate principal amounts denominated in U.S. dollars under the Revolving Credit Facility, the 2021 Term loan facility and the 2020 Term Loan Facility (each as defined below) transitioned from underlying LIBOR benchmarked rates to the Term Secured Overnight Financing Rate ("SOFR"). During fiscal 2022, the aggregate principal amounts denominated in British pounds under the Revolving Credit Facility, 2021 Term Loan Facility and 2020 Term Loan Facility transitioned from underlying LIBOR benchmarked rates to Sterling Overnight Index Average ("SONIA") rates. (2) Depending on the Company’s Consolidated Leverage Ratio or Debt Rating (each as defined in the credit agreement governing the Revolving Credit Facility (defined below)), U.S. dollar denominated borrowings under the Revolving Credit Facility bear interest at either a SOFR rate plus a margin of between 0.975% and 1.725% or a base rate plus a margin of between 0% and 0.625%.The applicable SOFR rates or LIBOR rate for the prior fiscal year end, including applicable margins, at September 29, 2023 and September 30, 2022 were approximately 8.75% and 4.08%. Borrowings denominated in British pounds bear interest at an adjusted SONIA rate plus a margin of between 0.908% and 1.6580%. There were no amounts drawn in British pounds as of September 29, 2023. (3) Depending on the Company’s Consolidated Leverage Ratio or Debt Rating (each as defined in the credit agreement governing the 2021 Term Loan Facility (defined below)), U.S. dollar denominated borrowings under the 2021 Term Loan Facility bear interest at either a SOFR rate plus a margin of between 0.975% and 1.725% or a base rate plus a margin of between0% and 0.625%. The applicable SOFR or LIBOR rate for the prior fiscal year end, including applicable margins for borrowings denominated in US Dollars at September 29, 2023 and September 30, 2022, was approximately 6.68% and 4.06%. Borrowings denominated in British pounds bear interest at an adjusted SONIA rate plus a margin of between 0.908% and 1.6580%, which was approximately 6.47% and 3.60% at September 29, 2023 and September 30, 2022, respectively. (4) Depending on the Company’s Consolidated Leverage Ratio or Debt Rating (each as defined in the credit agreement governing the 2020 Term Loan Facility), U.S. dollar denominated borrowings under the 2020 Term Loan Facility bear interest at either a SOFR rate plus a margin of between 0.975% and 1.725% or a base rate plus a margin of between 0% and 0.625%. The applicable SOFR or LIBOR rate for the prior fiscal year end, including applicable margins for borrowings denominated in US Dollars at September 29, 2023 and September 30, 2022 were approximately 6.68% and 4.49%. Borrowings denominated in British pounds bear interest at an adjusted SONIA rate plus a margin between 0.908% and 1.6580%, which was approximately 6.47% and 3.60% at September 29, 2023 and September 30, 2022, respectively. (5) From and including September 1, 2028 (the “First Step Up Date”), the interest rate payable on the 5.90% Bonds (as defined below) will be increased by an additional 12.5 basis points to 6.025% per annum (the “First Step Up Interest Rate”) unless the Company notifies the Trustee (as defined below) on or before the date that is 15 days prior to the First Step Up Date that the Percentage of Gender Diversity Performance Target (as defined in the First Supplemental Indenture (as defined below)) has been satisfied and receives a related assurance letter verifying such compliance. From and including September 1, 2030 (the “Second Step Up Date”), the interest rate payable on the 5.90% Bonds will be increased by 12.5 basis points to (x) 6.150% per annum if the First Step Up Interest Rate was in effect immediately prior to the Second Step Up Date or (y) 6.025% per annum if the initial interest rate was in effect immediately prior to the Second Step Up Date, unless the Company notifies the Trustee on or before the date that is 15 days prior to the Second Step Up Date that the GHG Emissions Performance Target (as defined in the First Supplemental Indenture) has been satisfied and receives a related assurance letter verifying such compliance. (6) All amounts due under the Note Purchase Agreement pursuant to which the Senior Notes (each as defined below) were issued were repaid in the first fiscal quarter of 2023. (7) The current portion of long-term debt is comprised of the 2020 Term Loan quarterly principal repayments of 1.25%, or $9.125 million and £3.125 million, of the aggregate initial principal amount borrowed. Revolving Credit Facility and Term Loans The Company and certain of its subsidiaries maintain a sustainability-linked $2.25 billion unsecured revolving credit facility (the “Revolving Credit Facility”) established under a third amended and restated credit agreement, dated February 6, 2023 (the "Revolving Credit Agreement"), among Jacobs and certain of its subsidiaries as borrowers and a syndicate of U.S. and international banks and financial institutions. The credit extensions under the Revolving Credit Facility can be funded in U.S dollars, British Sterling, Euros, Canadian dollars, Australian dollars, Swedish Krona, Singapore dollars and other agreed upon alternative currencies. The Revolving Credit Agreement also provides for a financial letter of credit sub facility of $400.0 million, permits performance letters of credit, and provides for a $100.0 million sub facility for swing line loans. Letters of credit are subject to fees based on the Company’s Consolidated Leverage Ratio and Debt Rating, whichever is more favorable to the Company. The Revolving Credit Agreement amended and restated the second amended restated credit agreement dated March 27, 2019, by and among JEGI and certain of its subsidiaries and a syndicate of banks and financial institutions, in order to, among other things, (a) extend the maturity date of the Revolving Credit Facility to February 6, 2028, (b) replace and adjust interest rates based on market conditions and incorporate a sustainability-linked pricing adjustment, (c) revise the commitment fee on the unused portion of the facility to a range of 0.10% to 0.25% depending on the higher of the pricing level associated with JEGI's Debt Rating or the Consolidated Leverage Ratio, (d) increase the Consolidated Leverage Ratio financial covenant to 3.50:1.00 (subject to temporary increases to 4.00:1.00 following the closing of certain material acquisitions), (e) eliminate the net worth financial covenant and (f) add the Company as a guarantor of the obligations of JEGI and its subsidiaries under the Revolving Credit Agreement. The Company and JEGI maintain an unsecured delayed draft term loan facility (the “2021 Term Loan Facility”) established under an amended and restated term loan agreement dated February 6, 2023 (the "Amended and Restated Term Loan Agreement"), by and among the Company and JEGI and a syndicate of banks and financial institutions. JEGI borrowed $200.0 million and £650.0 million of term loans under the 2021 Term Loan Facility and the proceeds of such term loans were used primarily to fund JEGI's investment in PA Consulting. The Amended and Restated Term Loan Agreement amends and restates the term loan agreement dated January 15, 2021, by and among JEGI and a syndicate of U.S. banks and financial institutions to, among other things: (a) extend the maturity date of the U.S. dollar term loan to February 6, 2026 and the British sterling term loan to September 1, 2025, (b) replace and adjust interest rates based on market conditions and incorporate a sustainability-linked pricing adjustment, (c) increase the Consolidated Leverage Ratio financial covenant to 3.50:1.00 (subject to temporary increases to 4.00:1.00 following the closing of certain material acquisitions), (d) eliminate the net worth financial covenant, and (e) add Jacobs as a guarantor of the obligations of JEGI under the Amended and Restated Term Loan Agreement. During the fourth quarter of fiscal 2023, the Company repaid $80.0 million of the USD portion of the 2021 Term Loan Facility. On March 25, 2020, JEGI and Jacobs U.K., a wholly owned subsidiary of JEGI, entered into a term loan agreement (the "2020 Term Loan Agreement") with a syndicate of banks and financial institutions, which provides for an unsecured term loan facility (the “2020 Term Loan Facility”). Under the 2020 Term Loan Facility, JEGI borrowed an aggregate principal amount of $730.0 million and Jacobs U.K. borrowed an aggregate principal amount of £250.0 million. The proceeds of the term loans were used to repay an existing term loan with a maturity date of June 2020 and for general corporate purposes. On February 6, 2023, the 2020 Term Loan Agreement was amended to, among other things: (a) replace and adjust interest rates based on market conditions and incorporate a sustainability-linked pricing adjustment, (b) increase the Consolidated Leverage Ratio financial covenant to 3.50:1.00 (subject to temporary increases to 4.00:1.00 following the closing of certain material acquisitions), (c) eliminate the net worth financial covenant, and (d) add Jacobs as a guarantor of the obligations of JEGI and Jacobs U.K. The 2020 Term Loan Facility and the 2021 Term Loan Facility are together referred to as the "Term Loan Facilities". In the fourth quarter of fiscal 2022, the Revolving Credit Facility and Term Loan Facilities were amended to permit the Holding Company Reorganization. We were in compliance with the covenants under the Revolving Credit Facility and Term Loan Facilities at September 29, 2023. 5.90% Bonds, due 2033 On February 16, 2023, JEGI completed an offering of $500 million aggregate principal amount of 5.90% Bonds due 2033 (the “5.90% Bonds”). The 5.90% Bonds are fully and unconditionally guaranteed by the Company (the “Guarantee”). The 5.90% Bonds and the Guarantee were offered pursuant to a prospectus supplement, dated February 13, 2023, to the prospectus dated February 6, 2023, that forms a part of the Company's and JEGI’s automatic shelf registration statement on Form S-3ASR previously filed with the Securities and Exchange Commission, and were issued pursuant to an Indenture, dated as of February 16, 2023, between JEGI, as issuer, the Company, as guarantor, and U.S. Bank Trust Company, National Association, as trustee (the “Trustee”), as amended and supplemented by the First Supplemental Indenture, dated as of February 16, 2023 (the “First Supplemental Indenture”). Interest on the 5.90% Bonds is payable semi-annually in arrears on each March 1 and September 1, commencing on September 1, 2023, until maturity. The 5.90% Bonds bear interest at 5.9% per annum, subject to adjustments as discussed in note (5) to the table above. Prior to December 1, 2032 (the “5.90% Bonds Par Call Date”), JEGI may redeem the 5.90% Bonds at its option, in whole or in part, at any time and from time to time, at the redemption price calculated by JEGI (expressed as a percentage of principal amount and rounded to three decimal places) equal to the greater of: (1) (a) the sum of the present values of the remaining scheduled payments of principal and interest on the 5.90% Bonds being redeemed, assuming that such 5.90% Bonds matured on the 5.90% Bonds Par Call Date, discounted to the redemption date on a semiannual basis (assuming a 360-day year of twelve 30-day months), at the Treasury Rate (as defined in the First Supplemental Indenture) plus 35 basis points, less (b) interest accrued to the redemption date, and (2) 100% of the principal amount of such 5.90% Bonds to be redeemed, plus, in either case, accrued and unpaid interest on the 5.90% Bonds, if any, to, but excluding, the redemption date. At any time and from time to time on or after the 5.90% Bonds Par Call Date, JEGI may redeem the 5.90% Bonds, at its option, in whole or in part, at a redemption price equal to 100% of the principal amount of the 5.90% Bonds to be redeemed, plus accrued and unpaid interest thereon, if any, up to, but excluding, the redemption date. 6.35% Bonds, due 2028 On August 18, 2023, JEGI completed an offering of $600 million aggregate principal amount of 6.35% Bonds due 2028 (the “6.35% Bonds”). The 6.35% Bonds are fully and unconditionally guaranteed by the Company (the “Guarantee”). The 6.35% Bonds and the Guarantee were offered pursuant to a prospectus supplement, dated August 15, 2023, to the prospectus dated February 6, 2023, that forms a part of the Company and JEGI’s automatic shelf registration statement on Form S-3ASR previously filed with the Securities and Exchange Commission, and were issued pursuant to an Indenture, dated as of February 16, 2023, between JEGI, as issuer, the Company, as guarantor, and the Trustee, as amended and supplemented by the Second Supplemental Indenture, dated as of August 18, 2023 (the “Second Supplemental Indenture”). Interest on the 6.35% Bonds is payable semi-annually in arrears on each February 18 and August 18, commencing on February 18, 2024, until maturity. The Notes will bear interest at a rate of 6.35% per annum and will mature on August 18, 2028. The 6.35% Bonds bear interest at 6.35% per annum. Prior to July 18, 2028 (the “6.35% Bonds Par Call Date”), JEGI may redeem the Notes at its option, in whole or in part, at any time and from time to time, at the redemption price calculated by JEGI (expressed as a percentage of principal amount and rounded to three decimal places) equal to the greater of: (1) (a) the sum of the present values of the remaining scheduled payments of principal and interest on the 6.35% Bonds being redeemed, assuming that such 6.35% Bonds matured on the 6.35% Bonds Par Call Date, discounted to the redemption date on a semiannual basis (assuming a 360-day year of twelve 30-day months), at the Treasury Rate (as defined in the Second Supplemental Indenture) plus 30 basis points, less (b) interest accrued to the redemption date, and (2) 100% of the principal amount of such 6.35% Bonds to be redeemed, plus, in either case, accrued and unpaid interest on the 6.35% Bonds, if any, to, but excluding, the redemption date. At any time and from time to time on or after the 6.35% Bonds Par Call Date, JEGI may redeem the 6.35% Bonds, at its option, in whole or in part, at a redemption price equal to 100% of the principal amount of the 6.35% Bonds to be redeemed, plus accrued and unpaid interest thereon, if any, to, but excluding, the redemption date. Senior Notes, Series A, B and C On March 12, 2018, the Company 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”). In connection with the Holding Company Reorganization, which was completed in August 2022, the Company launched an offer to repurchase its outstanding Senior Notes at par plus accrued and unpaid interest, and without any make-whole premium. In fiscal first quarter 2023, the Company repurchased $481 million of Senior Notes held by holders who accepted the offer with proceeds from the Revolving Credit Facility. In December 2022, the Company repurchased the remaining $19 million of Senior Notes. We believe the carrying value of the Revolving Credit Facility, the Term Loan Facilities and other debt approximates fair value based on the interest rates and scheduled maturities applicable to the outstanding borrowings. At September 29, 2023, the fair value of the 5.9% Bonds and the 6.35% Bonds is estimated to be $475.7 million and $598.4 million, respectively, 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. Other Arrangements The Company has issued $0.9 million in letters of credit under the Revolving Credit Facility, leaving $2.24 billion of available borrowing capacity under the Revolving Credit Facility at September 29, 2023. In addition, the Company had issued $321.1 million under separate, committed and uncommitted letter-of-credit facilities for total issued letters of credit of $322.0 million at September 29, 2023. During fiscal 2022, the Company entered into two treasury lock agreements with an aggregate notional value of $500.0 million to manage its expected interest rate exposure in anticipation of issuing up to $500 million of fixed rate debt. On February 13, 2023 and with the issuance of the 5.90% Bonds, the Company settled these treasury lock agreements. See Note 17- Commitments and Contingencies and Derivative Financial Instruments for more discussion around this transaction. During fiscal 2020, the Company entered into interest rate and cross currency derivative contracts to swap a portion of our variable rate debt to fixed rate debt. See Note 17 - Commitments and Contingencies and Derivative Financial Instruments for discussion regarding the Company's derivative instruments. The following table presents the amount of interest paid by the Company during September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 $207,604 $88,031 $54,860

Leases

Leases	12 Months Ended
	Sep. 29, 2023
Leases [Abstract]
Leases	Leases The components of lease expense (reflected in selling, general and administrative expenses) for th e years ended September 29, 2023, September 30, 2022 and October 1, 2021 were as follows (in thousands): September 29, 2023 September 30, 2022 October 1, 2021 Lease cost Operating lease cost $ 141,116 $ 151,134 $ 160,026 Variable lease cost 37,375 36,631 31,727 Sublease income (17,972) (15,207) (12,359) Total lease cost $ 160,519 $ 172,558 $ 179,394 Supplemental information related to the Company's leases for the years ended September 29, 2023 and September 30, 2022 was as follows (in thousands): September 29, 2023 September 30, 2022 Cash paid for amounts included in the measurements of lease liabilities $ 182,831 $ 229,275 Right-of-use assets obtained in exchange for new operating lease liabilities $ 76,210 $ 38,110 Weighted average remaining lease term - operating leases 5.9 years 6.3 years Weighted average discount rate - operating leases 3.2% 2.8% Total remaining lease payments under the Company's leases for each of the succeeding years is as follows (in thousands): Fiscal Year Operating Leases 2024 $ 172,405 2025 142,232 2026 118,411 2027 97,226 2028 80,278 Thereafter 156,537 767,089 Less Interest (71,782) $ 695,307 Right-of-Use and Other Long-Lived Asset Impairment During fiscal 2023 and 2022, as a result of the Company's transformation initiatives, including the changing nature of the Company's use of office space for its workforce, the Company evaluated its existing real estate lease portfolio. These initiatives resulted in the abandonment of certain leased office spaces and the establishment of a formal plan to sublease certain other leased spaces that will no longer be utilized by the Company. In connection with the Company’s actions related to these initiatives, the Company evaluated certain of its lease right-of-use assets and related property, equipment and leasehold improvements for impairment under ASC 360. As a result of the analysis, the Company recognized impairment losses of $48.2 million and $78.3 million for the fiscal years ended September 29, 2023 and September 30, 2022, respectively, which are included in selling, general and administrative expenses in the accompanying statements of earnings. The impairment losses recorded include $42.2 million and $60.7 million related to right-of-use lease assets and $6.0 million and $17.7 million related to other long-lived assets, including property, equipment & improvements and leasehold improvements for the fiscal years ended September 29, 2023 and September 30, 2022, respectively. The fair values for the asset groups relating to the impaired long-lived assets were estimated primarily using discounted cash flow models (income approach) with Level 3 inputs. The significant assumptions used in estimating fair value include the expected downtime prior to the commencement of future subleases, projected sublease income over the remaining lease periods and discount rates that reflect the level of risk associated with receiving future cash flows.
Leases	Leases The components of lease expense (reflected in selling, general and administrative expenses) for th e years ended September 29, 2023, September 30, 2022 and October 1, 2021 were as follows (in thousands): September 29, 2023 September 30, 2022 October 1, 2021 Lease cost Operating lease cost $ 141,116 $ 151,134 $ 160,026 Variable lease cost 37,375 36,631 31,727 Sublease income (17,972) (15,207) (12,359) Total lease cost $ 160,519 $ 172,558 $ 179,394 Supplemental information related to the Company's leases for the years ended September 29, 2023 and September 30, 2022 was as follows (in thousands): September 29, 2023 September 30, 2022 Cash paid for amounts included in the measurements of lease liabilities $ 182,831 $ 229,275 Right-of-use assets obtained in exchange for new operating lease liabilities $ 76,210 $ 38,110 Weighted average remaining lease term - operating leases 5.9 years 6.3 years Weighted average discount rate - operating leases 3.2% 2.8% Total remaining lease payments under the Company's leases for each of the succeeding years is as follows (in thousands): Fiscal Year Operating Leases 2024 $ 172,405 2025 142,232 2026 118,411 2027 97,226 2028 80,278 Thereafter 156,537 767,089 Less Interest (71,782) $ 695,307 Right-of-Use and Other Long-Lived Asset Impairment During fiscal 2023 and 2022, as a result of the Company's transformation initiatives, including the changing nature of the Company's use of office space for its workforce, the Company evaluated its existing real estate lease portfolio. These initiatives resulted in the abandonment of certain leased office spaces and the establishment of a formal plan to sublease certain other leased spaces that will no longer be utilized by the Company. In connection with the Company’s actions related to these initiatives, the Company evaluated certain of its lease right-of-use assets and related property, equipment and leasehold improvements for impairment under ASC 360. As a result of the analysis, the Company recognized impairment losses of $48.2 million and $78.3 million for the fiscal years ended September 29, 2023 and September 30, 2022, respectively, which are included in selling, general and administrative expenses in the accompanying statements of earnings. The impairment losses recorded include $42.2 million and $60.7 million related to right-of-use lease assets and $6.0 million and $17.7 million related to other long-lived assets, including property, equipment & improvements and leasehold improvements for the fiscal years ended September 29, 2023 and September 30, 2022, respectively. The fair values for the asset groups relating to the impaired long-lived assets were estimated primarily using discounted cash flow models (income approach) with Level 3 inputs. The significant assumptions used in estimating fair value include the expected downtime prior to the commencement of future subleases, projected sublease income over the remaining lease periods and discount rates that reflect the level of risk associated with receiving future cash flows.

Employee Stock Purchase and Sto

Employee Stock Purchase and Stock Incentive Plans	12 Months Ended
	Sep. 29, 2023
Share-Based Payment Arrangement [Abstract]
Employee Stock Purchase and Stock Incentive Plans	Employee Stock Purchase and Stock Incentive Plans Employee Stock Purchase Plans Under the Company's stock purchase plans, eligible employees who elect to participate in these plans are granted the right to purchase shares of the common stock of Jacobs at a discount that is limited to 5% of the per-share market value on the day shares are sold to employees. The following table summarizes the stock issuance activity under the plans for the fiscal years ended September 29, 2023, September 30, 2022 and October 1, 2021: For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 Aggregate Purchase Price Paid for Shares Sold (in thousands): $ 40,195 $ 38,648 $ 32,149 Aggregate Number of Shares Sold: 355,007 302,429 287,587 At September 29, 2023, there rema ins 2,520,441 sh ares reserved for issuance under the Company's stock purchase plans. Stock Incentive Plans We also sponsor the 2023 Stock Incentive Plan, as amended and restated (the "2023 SIP") and the 1999 Outside Director Stock Plan, as amended and restated (the "1999 ODSP") as well as the StreetLight 2011 Stock Plan (the "StreetLight Plan"). The 2023 SIP provides for the issuance of incentive stock options, non-qualified stock options, share appreciation rights ("SARs"), restricted stock and restricted stock units to employees. The 1999 ODSP provides for awards of shares of common stock, restricted stock, restricted stock units and grants of non-qualified stock options to our outside (i.e., nonemployee) directors. Together the 2023 SIP and 1999 ODSP plans are known as the "Stock Incentive Plans". The StreetLight Plan provides for the issuance of incentive stock options, nonstatutory stock options and restricted stock to employees. The StreetLight Plan is frozen for new awards effective February 4, 2022. The following table sets forth certain information about the Stock Incentive Plans: 2023 SIP 1999 ODSP Total Number of shares authorized 29,850,000 1,100,000 30,950,000 Number of remaining shares reserved for issuance at September 29, 2023 3,151,532 204,281 3,355,813 Number of shares relating to outstanding stock options at September 29, 2023 61,125 57,225 118,350 Number of shares available for future awards: At September 29, 2023 3,090,407 147,056 3,237,463 At September 30, 2022 3,886,740 161,087 4,047,827 Effective September 28, 2012 until January 23, 2023, all grants of shares under the predecessor to the 2023 SIP were issued on a fungible basis. An award other than an option or SAR was granted on a 1.92-to-1.00 basis (“Fungible”). An award of an option or SAR is granted on a 1-to-1 basis (“Not Fungible”). Effective January 24, 2023, at which time the 2023 SIP was adopted, all awards are granted on a 1-to-1 basis. At September 29, 2023, the amount of compensation cost relating to non-vested awards not yet recognized in the financial statements is approximately $126.3 million. The majority of these unrecognized compensation costs will be recognized by the third quarter of fiscal 2026. The weighted average remaining contractual term of options currently exercisable is 2.7 years. Stock Options The following table summarizes the stock option activity for the years ended September 29, 2023, September 30, 2022 and October 1, 2021: Number of Stock Options Weighted Average Outstanding at October 2, 2020 706,489 $ 45.91 Exercised (130,030) $ 47.07 Cancelled or expired (2,475) $ 45.18 Outstanding at October 1, 2021 573,984 $ 45.65 Granted (1) 150,951 $ 12.79 Exercised (284,502) $ 43.56 Cancelled or expired (1,084) $ 21.34 Outstanding at September 30, 2022 439,349 $ 35.77 Exercised (215,649) $ 40.61 Cancelled or expired (6,219) $ 19.73 Outstanding at September 29, 2023 217,481 $ 31.43 (1) Included in the fiscal 2022 amounts granted are options issued related to a recent business combination with strike prices lower than the then-current share price in order to derive a certain value. Cash received from the exercise of stock options, net of tax remitted, during the year ended September 29, 2023 was $7.5 million . Stock options outstanding at September 29, 2023 consisted of incentive stock options and non-qualified stock options. The following table presents the total intrinsic value of stock options exercised for the fiscal years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 $17,635 $28,149 $9,693 The total intrinsic value of stock options exercisable at September 29, 2023 was approximately $18.4 million. The following table presents certain other information regarding our 2023 SIP, 1999 OSDP and StreetLight Plan for the fiscal years ended September 29, 2023, September 30, 2022 and October 1, 2021: September 29, 2023 September 30, 2022 October 1, 2021 At fiscal year end: Range of exercise prices for options exercisable (1) $5.64–$60.43 $5.64–$60.43 $37.03–$60.43 Number of options exercisable 180,911 367,624 573,984 For the fiscal year: Range of prices relating to options exercised $7.05–$60.43 $11.27-$60.43 $32.51-$60.43 (1) Included in the fiscal 2022 amounts granted are options issued related to a recent business combination with strike prices lower than the then-current share price in order to derive a certain value. The following table presents certain information regarding stock options outstanding at September 29, 2023: September 29, 2023 Options Outstanding Range of Exercise Prices Number Weighted Average Remaining Contractual Life (years) Weighted Average Price $0.00 - $37.03 99,131 6.49 $ 12.57 $37.03 - $46.09 71,750 1.88 $ 41.80 $46.09 - $55.13 31,375 0.65 $ 53.19 $55.13 - $80.63 15,225 0.42 $ 60.43 217,481 3.70 $ 31.43 The 1999 ODSP, the 2023 SIP, and the StreetLight Plan allow participants to satisfy the exercise price of stock options by tendering shares of Jacobs common stock that have been owned by the participants for at least six months. Shares tendered are retired, canceled, and shown as repurchases of common stock in the accompanying Consolidated Statements of Stockholders’ Equity. The weighted average remaining contractual term of options currently exercisable i s 2.9 years . Restricted Stock The following table presents the number of shares of restricted stock and restricted stock units issued as common stock under the 2023 SIP and the StreetLight Plan for the years ended September 29, 2023, September 30, 2022 and October 1, 2021: For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 Restricted stock — 818 — Restricted stock units (service condition) 996,345 290,582 380,722 Restricted stock units (service and performance conditions) 126,595 176,470 181,132 The amount of restricted stock units issued for awards with performance conditions in the above table are issued based on performance against the target amount. The number of shares ultimately issued, which could be greater or less than target, will be based on achieving specific performance conditions related to the awards as well as achieving the service condition required for the restricted stock units to vest. The following table presents the fair value of shares of the 2023 SIP and the StreetLight Plan (of restricted stock and restricted stock units) vested for the years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 Restricted Stock and Restricted Stock Units (service condition) $ 32,255 $ 23,077 $ 20,374 Restricted Stock Units (service, market, and performance conditions at target) 22,060 22,678 26,495 Total $ 54,315 $ 45,755 $ 46,869 The following table presents the number and weighted average grant-date fair value of restricted stock and restricted stock units at September 29, 2023: Number of Shares Weighted Average Grant-Date Fair Value Outstanding at September 30, 2022 1,375,429 $ 110.64 Granted 1,192,105 $ 122.41 Vested (543,827) $ 102.14 Canceled (133,559) $ 121.89 Outstanding at September 29, 2023 1,890,148 $ 119.71 The following table presents the number of shares of restricted stock and restricted stock units canceled and withheld for taxes under the 2023 SIP for the years ended September 29, 2023, September 30, 2022 and October 1, 2021: For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 Restricted stock — — — Restricted stock units (service condition) 94,249 57,366 201,967 Restricted stock units (service and performance conditions) 39,295 31,966 218,520 The amount of unvested restricted stock units canceled for awards with service and performance conditions in the above table is based on the service period achieved and performance against the target amount. The restrictions attached to restricted stock and restricted stock units generally relate to the recipient’s ability to sell or otherwise transfer the stock or stock units. There are also restrictions that subject the stock and stock units to forfeiture back to the Company until earned by the recipient through continued employment or service. The following table provides the number of restricted stock units outstanding at September 29, 2023 under the 2023 SIP. September 29, 2023 Restricted stock — Restricted stock units (service condition) 1,341,150 Restricted stock units (service and performance conditions) 488,588 The following table presents the number of shares of restricted stock and restricted stock units issued under the 1999 ODSP for the years ended September 29, 2023, September 30, 2022 and October 1, 2021: For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 Restricted stock units (service condition) 14,031 13,785 17,680 No shares of restricted stock were issued under the 1999 ODSP during such periods. The following table provides the number of shares of restricted stock and restricted stock units outstanding at September 29, 2023 under the 1999 ODSP: September 29, 2023 Restricted stock — Restricted stock units (service condition) 60,359

Savings and Deferred Compensati

Savings and Deferred Compensation Plans	12 Months Ended
	Sep. 29, 2023
Savings And Deferred Compensation Plans [Abstract]
Savings and Deferred Compensation Plans	Savings and Deferred Compensation Plans Savings Plans We sponsor various defined contribution savings plans which allow participants to make voluntary contributions by salary deduction. Such plans cover substantially all of our domestic, nonunion employees in the U.S. and are qualified under Section 401(k) of the U.S. Internal Revenue Code. Similar plans outside the U.S. cover various groups of employees of our international subsidiaries and affiliates. Several of these plans allow the Company to match, on a voluntary basis, a portion of the employee contributions. The following table presents the Company’s contributions to these savings plans for the years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): September 29, 2023 September 30, 2022 October 1, 2021 $ 203,438 $ 184,399 $ 132,865 Deferred Compensation Plans Our non-qualified deferred compensation programs provide benefits payable to directors, officers, and certain key employees or their designated beneficiaries at specified future dates, upon retirement, or death. The plans are unfunded; therefore, benefits are paid from the general assets of the Company. Participants' cash deferrals earn a return based on the participants' selection of investments in several hypothetical investment options. Participants are also able to defer stock based compensation in the plans, which must remain invested in Company stock and are distributed in shares of Jacobs common stock. Since no investment diversification is permitted, changes in the fair value of Jacobs' common stock are not recognized. For the deferred compensation held in company stock, the number of shares needed to settle the liability is included in the denominator in both the basic and diluted earnings per share calculations. The following table presents the amount charged to expense for the Company’s deferred compensation plans for the years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): September 29, 2023 September 30, 2022 October 1, 2021 $ 4,679 $ 1,697 $ 2,900 The following table presents the amount relating to assets held as deferred compensation arrangement investments for the years ended September 29, 2023 and September 30, 2022 (in thousands): September 29, 2023 September 30, 2022 Deferred compensation arrangement investments $ 168,615 $ 165,118

Pension and Other Postretiremen

Pension and Other Postretirement Benefit Plans	12 Months Ended
	Sep. 29, 2023
Retirement Benefits [Abstract]
Pension and Other Postretirement Benefit Plans	Pension and Other Postretirement Benefit Plans Company-Only Sponsored Plans We sponsor various defined benefit pension and other post retirement plans covering employees of certain U.S. and international subsidiaries. The pension plans provide pension benefits that are based on the employee’s compensation and years of service. Our funding policy varies by country and plan according to applicable local funding requirements and plan-specific funding agreements. The accounting for pension and other post-retirement benefit plans requires the use of assumptions and estimates in order to calculate periodic benefit cost and the value of the plans’ assets and benefit obligations. These assumptions include discount rates, investment returns, and projected salary increases, among others. The discount rates used in valuing the plans' benefit obligations were determined with reference to high quality corporate and government bonds that are appropriately matched to the duration of each plan's obligations. The expected long-term rate of return on plan assets is generally based on using country-specific simulation models which select a single outcome for expected return based on the target asset allocation. The expected long-term rates of return used in the valuation are the annual average returns generated by these assumptions over a 20-year period for each asset class based on the expected long-term rate of return of the underlying assets. The following table sets forth the changes in the plans’ combined net benefit obligation (segregated between plans existing within and outside the U.S.) for the years ended September 29, 2023 and September 30, 2022 (in thousands): U.S. Plans Non-U.S. Plans September 29, 2023 September 30, 2022 September 29, 2023 September 30, 2022 Net benefit obligation at the beginning of the year $ 299,503 $ 404,820 $ 1,365,466 $ 2,375,640 Service cost 140 236 6,926 6,480 Interest cost 15,629 10,350 74,077 42,328 Participants’ contributions — — 143 249 Actuarial gains (1) (6,533) (85,067) (176,207) (651,798) Benefits paid (26,887) (25,565) (76,739) (74,378) Curtailments/settlements/plan amendments — (5,271) (1,313) (2,641) Effect of exchange rate changes and other, net — — 107,908 (330,414) Net benefit obligation at the end of the year $ 281,852 $ 299,503 $ 1,300,261 $ 1,365,466 (1) Actuarial gains primarily driven by change in discount rates. The following table sets forth the changes in the combined Fair Value of the plans’ assets (segregated between plans existing within and outside the U.S.) for the years ended September 29, 2023 and September 30, 2022 (in thousands): U.S. Plans Non-U.S. Plans September 29, 2023 September 30, 2022 September 29, 2023 September 30, 2022 Fair value of plan assets at the beginning of the year $ 286,193 $ 385,521 $ 1,297,625 $ 2,203,495 Actual returns (losses) on plan assets 18,310 (68,585) (103,324) (557,972) Employer contributions 85 93 28,991 33,032 Participants’ contributions — — 143 249 Gross benefits paid (27,005) (25,565) (77,070) (74,378) Curtailments/settlements/plan amendments — (5,271) (1,313) (2,641) Effect of exchange rate changes and other, net — — 97,973 (304,160) Fair value of plan assets at the end of the year $ 277,583 $ 286,193 $ 1,243,025 $ 1,297,625 During fiscal 2023 and 2022, the Company incurred combined curtailment and settlement losses on our defined benefit plans of approxima tely $0.2 million and $0.1 million, respectively. The following table reconciles the combined funded statuses of the plans recognized in the accompanying Consolidated Balance Sheets at September 29, 2023 and September 30, 2022 (segregated between plans existing within and outside the U.S.) (in thousands): U.S. Plans Non-U.S. Plans September 29, 2023 September 30, 2022 September 29, 2023 September 30, 2022 Net benefit obligation at the end of the year $ 281,852 $ 299,503 $ 1,300,261 $ 1,365,466 Fair value of plan assets at the end of the year 277,583 286,193 1,243,025 1,297,625 Underfunded amount recognized at the end of the year $ 4,269 $ 13,310 $ 57,236 $ 67,841 The following table presents the accumulated benefit obligation at September 29, 2023 and September 30, 2022 (segregated between plans existing within and outside the U.S.) (in thousands): U.S. Plans Non-U.S. Plans September 29, 2023 September 30, 2022 September 29, 2023 September 30, 2022 Accumulated benefit obligation at the end of the year $ 280,956 $ 299,347 $ 1,285,980 $ 1,355,717 The following table presents the amounts recognized in the accompanying Consolidated Balance Sheets at September 29, 2023 and September 30, 2022 (segregated between plans existing within and outside the U.S.) (in thousands): U.S. Plans Non-U.S. Plans September 29, 2023 September 30, 2022 September 29, 2023 September 30, 2022 Prepaid benefit cost included in noncurrent assets $ 758 $ — $ 57,678 $ 54,897 Accrued benefit cost included in current liabilities 80 83 5,182 4,359 Accrued benefit cost included in noncurrent liabilities 4,947 13,227 109,732 118,379 Net amount recognized at the end of the year $ 4,269 $ 13,310 $ 57,236 $ 67,841 The following table presents the significant actuarial assumptions used in determining the funded statuses and the following year's benefit cost of the Company’s U.S. plans for the years ended September 29, 2023, September 30, 2022 and October 1, 2021: For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 Discount rates 5.8% to 5.9% 4.2% to 5.5% 2.3% to 2.8% Rates of compensation increases 3.5% 3.5% 3.5% Expected long-term rates of return on assets 4.8% to 7.0% 5.5% to 6.4% 4.7% to 5.1% The following table presents the significant actuarial assumptions used in determining the funded statuses and the following year's benefit cost of the Company’s non-U.S. plans for the years ended September 29, 2023, September 30, 2022 and October 1, 2021: For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 Discount rates 3.8% to 6.9% 2.4% to 7.4% 0.6% to 6.6% Rates of compensation increases 2.8% to 9.0% 2.5% to 9.0% 2.4% to 7.5% Expected long-term rates of return on assets 5.3% to 7.6% 3.3% to 7.5% 2.0% to 7.0% The following table presents certain amounts relating to our U.S. plans recognized in accumulated other comprehensive (gain) loss at September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): September 29, 2023 September 30, 2022 October 1, 2021 Arising during the period: Net actuarial (gains) losses $ (4,032) $ 578 $ (25,109) Prior service cost — — — Total (4,032) 578 (25,109) Reclassification adjustments: Net actuarial gains (losses) 1,335 (2,157) (3,204) Prior service benefit (324) (324) (325) Total 1,011 (2,481) (3,529) Total $ (3,021) $ (1,903) $ (28,638) The following table presents certain amounts relating to our non-U.S. plans recognized in accumulated other comprehensive (gain) loss at September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): September 29, 2023 September 30, 2022 October 1, 2021 Arising during the period: Net actuarial losses (gains) $ 27,188 $ (78,705) $ (65,547) Prior service cost — — — Total 27,188 (78,705) (65,547) Reclassification adjustments: Net actuarial losses (4,802) (5,492) (8,761) Prior service benefit (1,068) (1,066) (1,219) Total (5,870) (6,558) (9,980) Total $ 21,318 $ (85,263) $ (75,527) The following table presents certain amounts relating to our plans recorded in accumulated other comprehensive loss that have not yet been recognized as components of net periodic benefit cost at September 29, 2023 and September 30, 2022 (segregated between U.S. and non-U.S. plans) (in thousands): U.S. Plans Non-U.S. Plans September 29, 2023 September 30, 2022 September 29, 2023 September 30, 2022 Net actuarial losses $ 34,940 $ 37,638 $ 269,671 $ 248,716 Prior service cost 373 697 20,708 20,344 Total $ 35,313 $ 38,335 $ 290,379 $ 269,060 The following table presents the amount of accumulated comprehensive income that will be amortized against earnings as part of our net periodic benefit cost in fiscal 2024 based on 2023 exchange rates (segregated between U.S. and non-U.S. plans) (in thousands): U.S. Plans Non-U.S. Plans Unrecognized net actuarial (gains) losses $ (1,384) $ 7,261 Unrecognized prior service cost 431 1,488 Accumulated comprehensive (gains) losses to be recorded against earnings $ (953) $ 8,749 We consider various factors in developing the estimates for the expected, long-term rates of return on plan assets. These factors include the projected, long-term rates of returns on the various types of assets in which the plans invest, as well as historical returns. In general, investment allocations are determined by each plan’s trustees and/or investment committees. The objectives of the plans’ investment policies are to (i) maximize returns while preserving capital; (ii) provide returns sufficient to meet the current and long-term obligations of the plan as the obligations become due; and (iii) maintain a diversified portfolio of assets so as to reduce the risk associated with having a disproportionate amount of the plans’ total assets invested in any one type of asset, issuer or geography. None of our pension plans hold Jacobs common stock directly (although some plans may hold shares indirectly through investments in mutual funds). The plans’ weighted average asset allocations at September 29, 2023 and September 30, 2022 (the measurement dates used in valuing the plans’ assets and liabilities) were as follows: U.S. Plans Non-U.S. Plans September 29, 2023 September 30, 2022 September 29, 2023 September 30, 2022 Equity securities 3 % 2 % 16 % 15 % Debt securities 65 % 66 % 50 % 49 % Real estate investments — % — % 10 % 11 % Other 32 % 32 % 24 % 25 % The following table presents the fair value of the Company’s Domestic U.S. plan assets at September 29, 2023, segregated by level of fair value measurement inputs within the Fair Value hierarchy promulgated by U.S. GAAP (in thousands): September 29, 2023 Fair Value, Determined Using Fair Value Measurement Inputs Level 1 Level 2 Level 3 Investments measured at Net Asset Value Total Equities $ 8,172 $ — $ — $ — $ 8,172 Domestic bonds 3,803 151,969 — — 155,772 Overseas bonds — 23,734 — — 23,734 Cash and equivalents 17,841 — — — 17,841 Mutual funds 72,064 — — — 72,064 Total $ 101,880 $ 175,703 $ — $ — $ 277,583 The following table presents the fair value of the Company’s non-U.S. plan assets at September 29, 2023, segregated by level of fair value measurement inputs within the Fair Value hierarchy promulgated by U.S. GAAP (in thousands): September 29, 2023 Fair Value, Determined Using Fair Value Measurement Inputs Level 1 Level 2 Level 3 Investments measured at Net Asset Value Total Domestic equities $ — $ 50,243 $ — $ 761 $ 51,004 Overseas equities — 74,377 — 80,123 154,500 Domestic bonds — 30,505 — — 30,505 Overseas bonds — 520,322 — 65,243 585,565 Cash and equivalents 21,568 434 — — 22,002 Real estate — 4,145 84,755 35,199 124,099 Insurance contracts — — 87,160 — 87,160 Hedge funds — — 78,617 19,130 97,747 Mutual funds — 90,443 — — 90,443 Total $ 21,568 $ 770,469 $ 250,532 $ 200,456 $ 1,243,025 The following table presents the fair value of the Company’s U.S. plan assets at September 30, 2022, segregated by level of fair value measurement inputs within the Fair Value hierarchy promulgated by U.S. GAAP (in thousands): September 30, 2022 Fair Value, Determined Using Fair Value Measurement Inputs Level 1 Level 2 Level 3 Investments measured at Net Asset Value Total Equities $ 6,708 $ — $ — $ — $ 6,708 Domestic bonds 64,396 106,961 — — 171,357 Overseas bonds — 15,200 — — 15,200 Cash and equivalents 19,025 — — — 19,025 Mutual funds 73,903 — — — 73,903 Total $ 164,032 $ 122,161 $ — $ — $ 286,193 The following table presents the fair value of the Company’s non-U.S. plan assets at September 30, 2022, segregated by level of fair value measurement inputs within the Fair Value hierarchy promulgated by U.S. GAAP (in thousands): September 30, 2022 Fair Value, Determined Using Fair Value Measurement Inputs Level 1 Level 2 Level 3 Investments measured at Net Asset Value Total Domestic equities $ — $ 42,655 $ — $ 1,539 $ 44,194 Overseas equities — 74,056 — 76,813 150,869 Domestic bonds — 38,448 — — 38,448 Overseas bonds — 532,697 — 64,897 597,594 Cash and equivalents 9,667 1,835 — — 11,502 Real estate — 4,076 102,868 36,959 143,903 Insurance contracts — — 80,231 80,231 Hedge funds — — 138,603 11,568 150,171 Mutual funds — 80,713 — — 80,713 Total $ 9,667 $ 774,480 $ 321,702 $ 191,776 $ 1,297,625 The following table summarizes the changes in the fair value of the Company’s non-U.S. Pension Plans’ Level 3 assets for the years ended September 29, 2023 and September 30, 2022 (in thousands): Real Estate Insurance Contracts Hedge Funds Balance at Balance at October 1, 2021 $ 116,936 $ 133,802 $ 231,319 Net purchases, sales, and settlements (8,686) (6,312) (11,553) Realized and unrealized gains (losses) 14,701 (24,770) (42,964) Effect of exchange rate changes (20,083) (22,489) (38,199) Balance at September 30, 2022 $ 102,868 $ 80,231 $ 138,603 Net purchases, sales, and settlements (35,119) 8,587 (56,624) Realized and unrealized gains (losses) 12,842 (13,555) (11,532) Effect of exchange rate changes 4,164 11,897 8,170 Balance at September 29, 2023 $ 84,755 $ 87,160 $ 78,617 The following table presents the amount of cash contributions we anticipate making into the plans during fiscal 2024 (in thousands): U.S. Plans Non-U.S. Plans Anticipated cash contributions $ — $ 19,281 The following table presents the total benefit payments expected to be paid to plan participants during each of the next five fiscal years, and in total for the five years thereafter (in thousands): U.S. Plans Non-U.S. Plans 2024 $ 29,761 $ 77,160 2025 28,452 79,545 2026 27,682 80,028 2027 26,269 86,229 2028 25,568 85,878 For the periods 2029 through 2033 111,361 441,520 The following table presents the components of net periodic benefit cost for the Company’s U.S. plans recognized in the accompanying Consolidated Statements of Earnings for the years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): September 29, 2023 September 30, 2022 October 1, 2021 Service cost $ 140 $ 236 $ 456 Interest cost 15,629 10,350 10,221 Expected return on plan assets (19,496) (16,933) (15,932) Actuarial (gains) losses (1,770) 2,861 4,249 Prior service cost 430 430 431 Net pension income, before special items $ (5,067) $ (3,056) $ (575) Curtailment expense/Settlement (gains) losses — (206) (64) Total net periodic pension income recognized $ (5,067) $ (3,262) $ (639) The following table presents the components of net periodic benefit cost for the Company’s Non-U.S. plans recognized in the accompanying Consolidated Statements of Earnings for the years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): September 29, 2023 September 30, 2022 October 1, 2021 Service cost $ 6,926 $ 6,480 $ 6,568 Interest cost 74,077 42,328 38,907 Expected return on plan assets (73,387) (71,875) (90,346) Actuarial losses 6,317 7,147 10,834 Prior service cost 1,424 1,421 1,519 Net pension cost (income), before special items $ 15,357 $ (14,499) $ (32,518) Curtailment expense/Settlement losses 208 329 2,847 Total net periodic pension cost (income) recognized $ 15,565 $ (14,170) $ (29,671) The service cost component of net periodic pension income is presented in direct cost of contracts and selling, general and administrative expenses while all other components are presented in miscellaneous income (expense), net on the Consolidated Statements of Earnings for the years presented above. Multiemployer Plans In the U.S. and various other countries, we contribute to trusteed pension plans covering hourly and certain salaried employees under industry-wide agreements. Contributions are based on the hours worked by employees covered under these agreements and are charged to direct costs of contracts on a current basis. With respect to these multiemployer plans, the Company's liability to fund these plans is generally limited to the contributions we are required to make under collective bargaining agreements. Based on our review of our multiemployer pension plans under the guidance provided in ASU 2011-09— Compensation-Retirement Benefits-Multiemployer Plans , we have concluded that none of the multiemployer pension plans into which we contribute are individually significant to our Consolidated Financial Statements. The following table presents the Company’s contributions to these multiemployer plans for the years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): September 29, 2023 September 30, 2022 October 1, 2021 Europe $ 1,530 $ 1,548 $ 1,713 United States 4,392 11,038 11,316 Contributions to multiemployer pension plans $ 5,922 $ 12,586 $ 13,029

PA Consulting Business Combinat

PA Consulting Business Combinations	12 Months Ended
	Sep. 29, 2023
Business Acquisition [Line Items]
PA Consulting Business Combinations	Other Business Combinations StreetLight Data, Inc. On February 4, 2022, the Company acquired StreetLight Data, Inc. ("StreetLight"). StreetLight is a pioneer of mobility analytics who uses its data and machine learning resources to shed light on mobility and enable users to solve complex transportation problems. The Company paid total base consideration of approximately $190.8 million in cash and issued $0.9 million in equity and $5.2 million in in-the-money stock options to the former owners of StreetLight. The Company also paid off StreetLight's debt of approximately $1.0 million simultaneously with the consummation of the acquisition. The following summarizes the fair values of StreetLight's assets acquired and liabilities assumed as of the acquisition date (in millions): Assets Cash and cash equivalents $ 7.3 Receivables 5.2 Property, equipment and improvements, net 0.1 Goodwill 116.4 Identifiable intangible assets 105.1 Prepaid expenses and other current assets 2.0 Total Assets $ 236.1 Liabilities Accounts payable, accrued expenses and other current liabilities $ 23.1 Other long-term liabilities 16.1 Total Liabilities 39.2 Net assets acquired $ 196.9 Goodwill recognized resulted 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 was deductible for tax purposes. The Company completed its final assessment of the fair values of StreetLight's assets acquired and liabilities assumed. Since the initial preliminary estimates reported in the second quarter of fiscal 2022, the Company updated certain amounts reflected in the preliminary purchase price allocation, as summarized in the fair values of StreetLight's assets acquired and liabilities assumed as of the acquisition date set forth above, the majority of which related to reclassifications between goodwill and intangibles and for deferred taxes. Identifiable intangibles are technology, data and customer relationships, contracts and backlog and have estimated lives of 5, 4 and 9 years, respectively. No summarized unaudited pro forma results are provided for the StreetLight acquisition due to the immateriality of this acquisition relative to the Company's consolidated financial position and results of operations. BlackLynx On November 19, 2021, Jacobs acquired BlackLynx, a provider of high-performance software, to complement Jacobs' portfolio of cyber, intelligence and digital solutions. The Company paid total base consideration of approximately $235.4 million in cash to the former owners of BlackLynx. In conjunction with the acquisition, the Company also paid off BlackLynx's debt of approximately $5.3 million simultaneously with the consummation of the acquisition. The following summarizes the fair values of BlackLynx's assets acquired and liabilities assumed as of the acquisition date (in millions): Assets Cash and cash equivalents $ 5.1 Receivables 7.7 Property, equipment and improvements, net 0.8 Goodwill 195.8 Identifiable intangible assets 51.1 Prepaid expenses and other current assets 3.2 Total Assets $ 263.7 Liabilities Accounts payable, accrued expenses and other current liabilities $ 19.5 Other long-term liabilities 8.8 Total Liabilities 28.3 Net assets acquired $ 235.4 Goodwill recognized resulted 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 was deductible for tax purposes. The Company completed its final assessment of the fair values of BlackLynx's assets acquired and liabilities assumed. Since the initial preliminary estimates reported in the first quarter of fiscal 2021, the Company updated certain amounts reflected in the preliminary purchase price allocation, as summarized in the fair values of BlackLynx's assets acquired and liabilities assumed as of the acquisition date set forth above, the majority of which related to reclassifications between goodwill and intangibles and for deferred taxes. Identifiable intangibles are technology and customer relationships, contracts and backlog and have estimated lives of 8 years and 4 years, respectively. No summarized unaudited pro forma results are provided for the BlackLynx acquisition due to the immateriality of this acquisition relative to the Company's consolidated financial position and results of operations. Buffalo Group On November 24, 2020, a subsidiary of Jacobs completed the acquisition of Buffalo Group, a leader in advanced cyber and intelligence solutions which allows Jacobs to further expand its cyber and intelligence solutions offerings to government clients. The Company paid total consideration o f $190.1 million, which was comprised of approximately $182.4 million in cash to the former owners of Buffalo Group and contingent consideration of $7.7 million. The contingent consideration was subsequently recognized in fiscal 2021 as an offset to selling, general and administrative expense when it was determined no amounts would be paid. In conjunction with the acquisition, the Company assumed the Buffalo Group's debt of approximately $7.7 million. The Company repaid all of the assumed Buffalo Group debt by the end of the first fiscal quarter of 2021. The following summarizes the fair values of The Buffalo Group's assets acquired and liabilities assumed as of the acquisition date (in millions): Assets Cash and cash equivalents $ 8.4 Receivables 19.2 Property, equipment and improvements, net 2.3 Goodwill 130.7 Identifiable intangible assets 74.0 Prepaid expenses and other current assets 6.2 Total Assets $ 240.8 Liabilities Accounts payable, accrued expenses and other current liabilities $ 46.9 Other long-term liabilities 3.8 Total Liabilities 50.7 Net assets acquired $ 190.1 Goodwill recognized is attributable to a substantial assembled workforce, which does not qualify for separate recognition, as well as expected future synergies from combining operations. All of the goodwill recognized was deductible for tax purposes, given the acquisition was structured as an asset acquisition for tax purposes. The Company completed its final assessment of the fair values of Buffalo Group's assets acquired and liabilities assumed. Since the initial preliminary estimates reported in the first quarter of fiscal 2021, the Company updated certain amounts reflected in the final purchase price allocation, as summarized in the fair values of Buffalo Group's assets acquired and liabilities assumed as of the acquisition date set forth above. Identifiable intangibles are customer relationships, contracts and backlog and have estimated lives of 9 years. No summarized unaudited pro forma results are provided for the Buffalo Group due to the immateriality of this acquisition relative to the Company's consolidated financial position and results of operations.
PA Consulting Group Limited
Business Acquisition [Line Items]
PA Consulting Business Combinations	PA Consulting Business Combination Deal Summary, Opening Balance Sheet and Pro Forma Financial Information On March 2, 2021, Jacobs completed the strategic investment of a 65% interest in PA Consulting, a UK-based leading innovation and transformation consulting firm. The total consideration paid by the Company was $1.7 billion, funded through cash on hand, proceeds from a new term loan and draws on the Company's existing Revolving Credit Facility. The remaining 35% interest was acquired by PA Consulting employees, whose redeemable noncontrolling interests had a fair value of $582.4 million on the closing date, including subsequent purchase accounting adjustments. PA Consulting is accounted for as a consolidated subsidiary and as a separate operating segment. See Note 9 - Borrowings for more discussion on the financing for the transaction. The following summarizes the fair values of PA Consulting's assets acquired and liabilities assumed as of the acquisition date (in millions): Assets Cash and cash equivalents $ 134.9 Receivables 166.5 Property, equipment and improvements, net 40.5 Goodwill 1,454.0 Identifiable intangible assets 1,004.2 Prepaid expenses and other current assets 9.5 Miscellaneous long-term assets 84.0 Total Assets $ 2,893.6 Liabilities Accounts payable $ 6.5 Accrued liabilities and other current liabilities 354.8 Other long-term liabilities 248.0 Total Liabilities 609.3 Redeemable Noncontrolling interests 582.4 Net assets acquired $ 1,701.9 Goodwill recognized is attributable to a substantial assembled workforce, which does not qualify for separate recognition, as well as expected future economic benefits. None of the goodwill recognized was deductible for tax purposes. The Company completed its final assessment of the fair values of PA Consulting's assets acquired and liabilities assumed. Since the initial preliminary estimates reported in the second quarter of fiscal 2021, the Company updated certain provisional amounts reflected in the final purchase price allocation, as summarized in the estimated fair values of PA Consulting assets acquired and liabilities assumed above. See below for further discussion on updates to redeemable noncontrolling interests. Identifiable intangibles are customer relationships, contracts and backlog and trade name and have estimated lives ranging from 9 to 20 years (weighted average life of approximately 12 years). The following presents summarized unaudited pro forma operating results of Jacobs from continuing operations assuming that the Company had the PA Consulting investment at September 28, 2019. 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, except per share data): For the Year Ended October 1, 2021 Revenues $ 14,504.3 Net earnings of the Group $ 695.1 Net earnings attributable to Jacobs $ 548.0 Net earnings attributable to Jacobs per share: Basic earnings per share $ 4.21 Diluted earnings per share $ 4.17 Included in the table above are charges relating to transaction expenses, a nonrecurring compensation charge and other items that are removed from the years ended October 1, 2021 and are reflected in the prior fiscal year due to the assumed timing of the transaction. Also, income tax expense for the fiscal year p ro forma period ended October 1, 2021 wa s $330.7 million . Redeemable Noncontrolling Interests In connection with the PA Consulting investment, the Company recorded redeemable noncontrolling interests, including subsequent purchase accounting adjustments, representing the noncontrolling interest holders' equity interests in the form of preferred and common shares of PA Consulting, with substantially all of the value associated with these interests allocable to the preferred shares. During fiscal 2023 and 2022, the Company repurchased certain shares of the redeemable noncontrolling interest holders for $92.9 million and $46.1 million, respectively, in cash and issued certain shares of redeemable noncontrolling interest holders for $34.0 million and $49.7 million, respectively. The difference between the cash purchase prices and the recorded book values of these repurchased and issued interests was recorded in the Company’s consolidated retained earnings. The Company held 69% and 65% of the outstanding ownership of PA Consulting as of September 29, 2023 and September 30, 2022, respectively. During fiscal 2023 the Company recognized approximately $8.3 million in redemption value adjustments associated with redeemable noncontrolling interests preference share repurchase and reissuance activities concluding in fourth quarter fiscal 2023 that were recorded as an increase in consolidated retained earnings and a $0.07 increase in earnings per share, the results of which had no impact on the Company’s overall results of operations, financial position or cash flows. During fiscal 2021, updates to the Company’s preliminary opening balance sheet fair value estimates of the noncontrolling interests resulted in an offsetting decrease and increase in fair value of the preference share and common share components of the interests by $57.3 million, respectively, with the corresponding redemption value adjustment associated with the preference share portion decreasing consolidated retained earnings and earnings per share by $0.44. See Note 4- Earnings Per Share and Certain Related Information . Changes in the Company's redeemable noncontrolling interests d uring the fiscal years ended September 29, 2023 and September 30, 2022 are as follows (in thousands): September 29, 2023 September 30, 2022 Redeemable noncontrolling interest at the beginning of the year $ 632,522 $ 657,722 Accrued Preferred Dividend to Preference Shareholders 72,891 67,598 Attribution of Preferred Dividend to Common Shareholders (72,891) (67,598) Net earnings attributable to redeemable noncontrolling interest to Common Shareholders 21,614 34,585 Redeemable Noncontrolling interests redemption value adjustment 10,770 27,657 Repurchase of redeemable noncontrolling interests (111,005) (53,834) Issuance of redeemable noncontrolling interests 37,789 54,884 Cumulative translation adjustment and other 41,289 (88,492) Redeemable noncontrolling interest at the end of the year $ 632,979 $ 632,522 In addition, certain employees and nonemployees of PA Consulting are eligible to receive equity-based incentive compensation under the terms of the applicable agreements. During the years ended September 29, 2023 and September 30, 2022, the Company recorded approximately $0.8 million and $3.3 million, respectively, in expense associated with these agreements which is reflected in selling, general and administrative expense in the consolidated statements of earnings. Restricted Cash The Company, through its investment in PA Consulting, held $2.8 million and $13.7 million at September 29, 2023 and September 30, 2022, respectively, in cash that is restricted from general use and is included in prepaid expenses and other current assets on the Consolidated Balance Sheets.

Other Business Combinations

Other Business Combinations	12 Months Ended
	Sep. 29, 2023
Business Combination and Asset Acquisition [Abstract]
Other Business Combinations	Other Business Combinations StreetLight Data, Inc. On February 4, 2022, the Company acquired StreetLight Data, Inc. ("StreetLight"). StreetLight is a pioneer of mobility analytics who uses its data and machine learning resources to shed light on mobility and enable users to solve complex transportation problems. The Company paid total base consideration of approximately $190.8 million in cash and issued $0.9 million in equity and $5.2 million in in-the-money stock options to the former owners of StreetLight. The Company also paid off StreetLight's debt of approximately $1.0 million simultaneously with the consummation of the acquisition. The following summarizes the fair values of StreetLight's assets acquired and liabilities assumed as of the acquisition date (in millions): Assets Cash and cash equivalents $ 7.3 Receivables 5.2 Property, equipment and improvements, net 0.1 Goodwill 116.4 Identifiable intangible assets 105.1 Prepaid expenses and other current assets 2.0 Total Assets $ 236.1 Liabilities Accounts payable, accrued expenses and other current liabilities $ 23.1 Other long-term liabilities 16.1 Total Liabilities 39.2 Net assets acquired $ 196.9 Goodwill recognized resulted 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 was deductible for tax purposes. The Company completed its final assessment of the fair values of StreetLight's assets acquired and liabilities assumed. Since the initial preliminary estimates reported in the second quarter of fiscal 2022, the Company updated certain amounts reflected in the preliminary purchase price allocation, as summarized in the fair values of StreetLight's assets acquired and liabilities assumed as of the acquisition date set forth above, the majority of which related to reclassifications between goodwill and intangibles and for deferred taxes. Identifiable intangibles are technology, data and customer relationships, contracts and backlog and have estimated lives of 5, 4 and 9 years, respectively. No summarized unaudited pro forma results are provided for the StreetLight acquisition due to the immateriality of this acquisition relative to the Company's consolidated financial position and results of operations. BlackLynx On November 19, 2021, Jacobs acquired BlackLynx, a provider of high-performance software, to complement Jacobs' portfolio of cyber, intelligence and digital solutions. The Company paid total base consideration of approximately $235.4 million in cash to the former owners of BlackLynx. In conjunction with the acquisition, the Company also paid off BlackLynx's debt of approximately $5.3 million simultaneously with the consummation of the acquisition. The following summarizes the fair values of BlackLynx's assets acquired and liabilities assumed as of the acquisition date (in millions): Assets Cash and cash equivalents $ 5.1 Receivables 7.7 Property, equipment and improvements, net 0.8 Goodwill 195.8 Identifiable intangible assets 51.1 Prepaid expenses and other current assets 3.2 Total Assets $ 263.7 Liabilities Accounts payable, accrued expenses and other current liabilities $ 19.5 Other long-term liabilities 8.8 Total Liabilities 28.3 Net assets acquired $ 235.4 Goodwill recognized resulted 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 was deductible for tax purposes. The Company completed its final assessment of the fair values of BlackLynx's assets acquired and liabilities assumed. Since the initial preliminary estimates reported in the first quarter of fiscal 2021, the Company updated certain amounts reflected in the preliminary purchase price allocation, as summarized in the fair values of BlackLynx's assets acquired and liabilities assumed as of the acquisition date set forth above, the majority of which related to reclassifications between goodwill and intangibles and for deferred taxes. Identifiable intangibles are technology and customer relationships, contracts and backlog and have estimated lives of 8 years and 4 years, respectively. No summarized unaudited pro forma results are provided for the BlackLynx acquisition due to the immateriality of this acquisition relative to the Company's consolidated financial position and results of operations. Buffalo Group On November 24, 2020, a subsidiary of Jacobs completed the acquisition of Buffalo Group, a leader in advanced cyber and intelligence solutions which allows Jacobs to further expand its cyber and intelligence solutions offerings to government clients. The Company paid total consideration o f $190.1 million, which was comprised of approximately $182.4 million in cash to the former owners of Buffalo Group and contingent consideration of $7.7 million. The contingent consideration was subsequently recognized in fiscal 2021 as an offset to selling, general and administrative expense when it was determined no amounts would be paid. In conjunction with the acquisition, the Company assumed the Buffalo Group's debt of approximately $7.7 million. The Company repaid all of the assumed Buffalo Group debt by the end of the first fiscal quarter of 2021. The following summarizes the fair values of The Buffalo Group's assets acquired and liabilities assumed as of the acquisition date (in millions): Assets Cash and cash equivalents $ 8.4 Receivables 19.2 Property, equipment and improvements, net 2.3 Goodwill 130.7 Identifiable intangible assets 74.0 Prepaid expenses and other current assets 6.2 Total Assets $ 240.8 Liabilities Accounts payable, accrued expenses and other current liabilities $ 46.9 Other long-term liabilities 3.8 Total Liabilities 50.7 Net assets acquired $ 190.1 Goodwill recognized is attributable to a substantial assembled workforce, which does not qualify for separate recognition, as well as expected future synergies from combining operations. All of the goodwill recognized was deductible for tax purposes, given the acquisition was structured as an asset acquisition for tax purposes. The Company completed its final assessment of the fair values of Buffalo Group's assets acquired and liabilities assumed. Since the initial preliminary estimates reported in the first quarter of fiscal 2021, the Company updated certain amounts reflected in the final purchase price allocation, as summarized in the fair values of Buffalo Group's assets acquired and liabilities assumed as of the acquisition date set forth above. Identifiable intangibles are customer relationships, contracts and backlog and have estimated lives of 9 years. No summarized unaudited pro forma results are provided for the Buffalo Group due to the immateriality of this acquisition relative to the Company's consolidated financial position and results of operations.

Restructuring and Other Charges

Restructuring and Other Charges	12 Months Ended
	Sep. 29, 2023
Restructuring and Related Activities [Abstract]
Restructuring and Other Charges	Restructuring and Other Charges During fiscal 2023, the Company implemented certain restructuring and other initiatives relating to the CMS separation and to our investment in PA Consulting, the activities of which are expected to continue through fiscal 2024 and restructuring activities related to the DVS segment reorganization that were completed in fiscal 2023. During fiscal 2022, the Company implemented certain restructuring and integration initiatives relating to the StreetLight and BlackLynx acquisitions, the activities of which are substantially completed. Also, during fiscal 2022 and continuing into fiscal 2023, the Company implemented further real estate rescaling efforts that were associated with its fiscal 2020 transformation program relating to real estate and other staffing initiatives. These initiatives are substantially completed. During fiscal 2021, the Company implemented certain integration related activities associated with our PA Consulting investment. These activities are substantially completed. Additionally, the Company recorded impairment charges on its investment in AWE ML during fiscal 2021 and 2022. See related discussion in Note 8- Joint ventures, VIEs and other investments . During fiscal 2019 and continuing into fiscal 2020, the Company implemented certain restructuring, separation and integration initiatives associated with the ECR sale and other related cost reduction initiatives. Additionally, in fiscal 2020, the Company implemented certain restructuring and integration initiatives associated with the acquisition of John Wood Group's nuclear business. The restructuring activities and related costs were comprised mainly of separation and lease abandonment and sublease programs, while the separation and 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 ECR-business separation. The activities of these initiatives have been substantially completed. As part of the Company's acquisition of CH2M Hill Companies, Ltd. ("CH2M") during fiscal 2018, the Company implemented certain restructuring plans that were comprised mainly of severance and lease abandonment programs as well as integration activities involving the engagement of professional services and internal personnel dedicated to the Company's integration management efforts. The activities of these initiatives have been substantially completed. 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 by operating segment in connection with the CH2M, John Wood Group's nuclear business, BlackLynx and StreetLight acquisitions, the PA Consulting investment, the ECR sale, the CMS separation, the DVS segment reorganization and the Company's transformation initiatives relating to real estate and other staffing programs and the impairment and final exit activities of the AWE ML investment for the years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): September 29, 2023 September 30, 2022 October 1, 2021 Critical Mission Solutions $ 3,143 $ 5,626 $ 5,079 People & Places Solutions 55,749 64,204 7,077 Divergent Solutions 8,307 — — PA Consulting 14,706 4,253 15,566 Corporate 51,130 86,980 71,868 Total 133,035 161,063 99,590 Amounts included in: Operating profit (mainly Selling, General and Administrative costs (“SG&A") (1) 136,411 173,555 61,042 Other (Income) Expense, net (2) (3,376) (12,492) 38,548 $ 133,035 $ 161,063 $ 99,590 (1) The year ended September 29, 2023 includes $63.4 million of restructuring and other charges across all segments relating to the CMS separation (mainly professional services and employee separation costs) and $14.3 million in restructuring and other charges relating to the Company's investment in PA Consulting (primarily employee separation costs). For the year ended September 30, 2022, amounts included $91.3 million pre-tax related to the final settlement of the Legacy CH2M Matter (as defined in Note 18 - Contractual Guarantees, Litigation, Investigations and Insurance ), net of previously recorded reserves and approximately $27 million in third party recoveries was recorded as receivables reducing SG&A. Included in the years ended September 29, 2023, September 30, 2022 and October 1, 2021 were $50.7 million, $78.3 million and $2.4 million in charges associated mainly with real estate impairments, the majority of which related to People and Places Solutions. (2) The years ended September 29, 2023 and September 30, 2022 included gains of $3.4 million and $8.7 million, respectively, related to lease terminations. The year ended October 1, 2021 included $38.5 million in charges related to the impairment of our AWE ML investment. The activity in the Company’s accrual for the Restructuring and other charges including the program activities described above for the year ended September 29, 2023 is as follows (in thousands): Balance at September 30, 2022 $ 4,137 Net Charges (1) 85,728 Payments & Usage (52,547) Balance at September 29, 2023 $ 37,318 (1) Exclude s $47.3 million in other net charges associated mainly with real estate related impairments and other transformation activities described above during the year ended September 29, 2023 . The following table summarizes the Restructuring and other charges by major type of costs for the years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): September 29, 2023 September 30, 2022 October 1, 2021 Lease Abandonments and Impairments $ 46,195 $ 69,802 $ 4,282 Voluntary and Involuntary Terminations 41,435 5,635 15,773 Outside Services 36,030 22,340 35,210 Other (1) 9,375 63,286 44,325 Total $ 133,035 $ 161,063 $ 99,590 (1) Amounts in the year ended September 29, 2023 are mainly comprised of charges associated with the write off of fixed assets associated with programs that the Company will no longer continue to pursue in connection with the CMS separation. Amounts in the year ended September 30, 2022 are mainly comprised of $91.3 million in other charges related to the final pre-tax settlement of the Legacy CH2M Matter, net of previously recorded reserves and approximately $27 million in third party recoveries was recorded as receivables reducing SG&A. Amounts in the year ended October 1, 2021 are mainly comprised of $38.5 million in charges related to the impairment of our AWE Management Ltd. investment. Cumulative amounts incurred to date under our various restructuring and other activities described above and with charges in the periods presented by each major type of cost as of September 29, 2023 are as follows (in thousands): Lease Abandonments and Impairments $ 432,724 Voluntary and Involuntary Terminations 182,191 Outside Services 347,950 Other 202,313 Total $ 1,165,178

Commitments and Contingencies a

Commitments and Contingencies and Derivative Financial Instruments	12 Months Ended
	Sep. 29, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies and Derivative Financial Instruments	Commitments and Contingencies and Derivative Financial Instruments Derivative Financial Instruments The Company is exposed to interest rate risk under its variable rate borrowings and additionally, due to the nature of the Compan y's international operations, we are at times exposed to foreign currency risk. As such, we sometimes enter into foreign exchange contracts and interest rate contracts in order to limit our exposure to fluctuating foreign currencies and interest rates. During fiscal 2022 we entered into two treasury lock agreements which had a total notional value of $500 million to manage our interest rate exposure to the anticipated issuance of fixed rate debt before December 2023. On February 13, 2023, the Company settled these treasury lock agreements and issued the 5.90% Bonds in the aggregate principal amount of $500 million, which resulted in the receipt of cash and a pre-tax gain of $37.4 million, which is being amortized to interest expense and recognized over the term of the 5.90% Bonds. See Note 9- Borrowings for further discussion relating to the terms of the 5.90% Bonds . The fair value of the treasury locks at September 30, 2022 was $40.9 million all of which was included in current assets within receivables and contract assets on the consolidated balance sheet. The net gain on these instruments was $26.5 million and $30.8 million, net of tax, and is included in accumulated other comprehensive income as of September 29, 2023 and September 30, 2022, respectively. In fiscal 2020 we entered into interest rate swap agreements with a notional va lue of $769.1 million as of September 29, 2023 to manage the interest rate exposure on our variable rate loan s. Additionally, we entered into a cross-currency swap agreement with a notional value of $127.8 million to manage the interest rate and foreign currency exposure on our USD borrowings by a European subsidiary. By entering into the swap agreements, the Company converted the LIBOR and SONIA rate based liabilities into fixed rate liabilities and, for the cross currency swap, our LIBOR rate based borrowing in USD to a fixed rate Euro liability, for periods ranging from three and a half to ten years. During fiscal 2023, the aggregate liability amounts denominated in U.S. dollars transitioned from underlying LIBOR benchmarked rates to the Secured Overnight Financing Rate ("SOFR") and the terms of the swaps were amended accordingly. The swaps were designated as cash-flow hedges in accordance with ASC 815, Derivatives and Hedging . See Note 2 - Significant Accounting Policies for additional discussion related to the application of SOFR and SONIA to existing hedge contracts. During the fourth quarter of fiscal 2023, the Company paid down the borrowings hedged by the cross currency swap and settled the cross currency swap agreement. The fair value of the interest rate swaps at September 29, 2023 was $102.6 million , and the fair value of the interest rate and cross currency swaps at September 30, 2022 was $128.2 million, which are included in miscellaneous other assets on the consolidated balance sheet. T he unrealized net gain on these interest rate swaps as of September 29, 2023 was $77.2 million, net of tax and the unrealized net gain on the interest rate and cross currency swaps as of September 30, 2022 was $87.5 million , net of tax, and was included in accumulated other comprehensive income. Additionally, at September 29, 2023 and September 30, 2022, the Company held foreign exchange forward contracts in currencies that support our operations, including British Pound, Euro, Australian Dollar and other currencies, with notional values of $857.7 million and $298.2 million at September 29, 2023 and September 30, 2022, respectively. The length of these contracts currently ranges from one The fair value measurements of these derivatives are being made using Level 2 inputs under ASC 820, Fair Value Measurement , as the measurements are based on observable inputs other than quoted prices in active markets. We are exposed to risk from credit-related losses resulting from nonperformance by counterparties to our financial instruments. We perform credit evaluations of our counterparties under forward exchange and interest rate contracts and expect all counterparties to meet their obligations. We have not experienced credit losses from our counterparties. Letters of Credit At September 29, 2023, the Company had issued and outstanding approximately $322.0 million in LOCs and $2.0 billion in surety bonds. Of the outstanding LOC amount, $0.9 million has been issued under the Revolving Credit Facility and $321.1 million are issued under separate, committed and uncommitted letter-of-credit facilities.

Contractual Guarantees, Litigat

Contractual Guarantees, Litigation, Investigations, and Insurance	12 Months Ended
	Sep. 29, 2023
Contractual Guarantees, Litigation, Investigations, and Insurance [Abstract]
Contractual Guarantees Litigation Investigations And Insurance	Contractual Guarantees, Litigation, Investigations and Insurance 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 or arbitration in which we are involved primarily includes personal injury claims, professional liability claims and breach of contract claims. 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" and 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. See Note 17 - Commitments and Contingencies and Derivative Financial Instruments for more information surrounding LOCs and 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 is asserted by or against the Company. We have also elected to retain a portion of certain losses, claims and liabilities that occur through the use of various deductibles, limits, and retentions under our insurance programs and utilize a number of internal financing mechanisms for these self insurance arrangements including the operation of certain captive insurance entities. 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 United States, as well as by various government agencies representing jurisdictions outside the United States. 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. Insurance recoveries are recorded as assets if recovery is probable and estimated liabilities are not reduced by expected insurance recoveries. 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, beyond amounts currently accrued. 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 ("JKC") 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 (the "Legacy CH2M Matter"). The subcontract was terminated in January 2017. In or around August 2017, the Consortium commenced an arbitration. On April 12, 2022, JKC and the Consortium entered into a confidential deed of settlement (“Settlement Agreement”). Under the terms of the Settlement Agreement, CH2M, as guarantor of CH2M Australia PTY Limited’s obligations with respect to the subcontract with JKC, made a cash payment to JKC in April 2022 of AUD 640 million (or approximately $475 million using mid-April 2022 exchange rates). As a result of the settlement agreement, additional pre-tax charges of $91.3 million were recorded during the year ended September 30, 2022 for this matter (over amounts previously reserved and reported in long-term Other Deferred Liabilities in the Company's Consolidated Balance Sheet). The Settlement Agreement provided for a release of claims between JKC and each member of the Consortium, and in connection with this agreement the members of the Consortium also waived all claims against each other and their respective parent guarantors relating to the project. On December 22, 2008, a coal fly ash pond at the Kingston Power Plant of the Tennessee Valley Authority ("TVA") was breached, releasing fly ash waste into the Emory River and surrounding community. In February 2009, TVA awarded a contract to the Company to provide project management services associated with the clean-up. All remediation and dredging were completed in August 2013 by other contractors under direct contracts with TVA. The Company did not perform the remediation, and its scope was limited to program management services. Certain employees of the contractors performing the cleanup work on the project filed lawsuits against the Company beginning in August 2013, alleging they were injured due to the Company's failure to protect the plaintiffs from exposure to fly ash, and asserting related personal injuries. The primary case, Greg Adkisson, et al. v. Jacobs Engineering Group Inc., case No. 3:13-CV-505-TAV-HBG, filed in the U.S. District Court for the Eastern District of Tennessee, consisted of 10 consolidated cases. This case and the related cases involved several hundred plaintiffs that were employees of the contractors that completed the remediation and dredging work. In the second quarter of fiscal 2023, the Company entered into a settlement agreement with the plaintiffs whose cases had not been previously dismissed. As of the third quarter of fiscal 2023, all conditions to the settlement had been satisfied, and the cases dismissed. The amount of the settlement was not material to the Company's business, financial condition, results of operations or cash flows.

Segment Information

Segment Information	12 Months Ended
	Sep. 29, 2023
Segment Reporting [Abstract]
Segment Information	Segment Information During the first quarter of fiscal 2023, the Company reorganized its operating and reporting structure to report results under a new operating segment, Divergent Solutions, in addition to the current operating segments. The Company's four operating segments are now comprised of its two global lines of business ("LOBs"): Critical Mission Solutions ("CMS") and People & Places Solutions ("P&PS"), its business unit Divergent Solutions ("DVS") and its majority investment in PA Consulting. The formation of the DVS operating segment resulted in certain portions of our CMS and P&PS businesses moving to the new segment. The Company’s Chief Executive Officer is the Chief Operating Decision Maker (“CODM”) and can 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 this organization, the sales function is managed by segment, and accordingly, the associated cost is embedded in the segments and reported to the respective head of each segment. 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 Leadership Performance Plan ("LPP"), formerly named the Management Incentive Plan, and the expense associated with the Jacobs Engineering Group Inc. 2023 Stock Incentive Plan 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 segment is reviewed by the CODM to assess performance and make decisions regarding the allocation of resources. The CODM evaluates the operating performance of our operating segments using segment operating profit, which is defined as consolidated operating profit less “corporate charges” (e.g., the allocated amounts described above). The Company incurs certain SG&A that relate to its business as a whole which are not allocated to the segments. The following tables present total revenues and segment operating profit from continuing operations 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, Restructuring and other charges (as defined in Note 16 -Restructuring and Other Charges ) and transaction and integration costs (in thousands). For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 Revenues from External Customers: Critical Mission Solutions $ 4,693,499 $ 4,376,562 $ 4,251,690 People & Places Solutions 9,553,857 8,534,650 8,364,640 Divergent Solutions 946,914 892,317 848,901 PA Consulting 1,158,144 1,119,296 627,401 Total $ 16,352,414 $ 14,922,825 $ 14,092,632 For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 Segment Operating Profit: Critical Mission Solutions $ 378,201 $ 355,563 $ 359,001 People & Places Solutions (1) 957,714 824,834 780,514 Divergent Solutions 81,768 67,552 88,026 PA Consulting 237,003 232,225 151,071 Total Segment Operating Profit 1,654,686 1,480,174 1,378,612 Other Corporate Expenses (2) (427,053) (364,440) (340,129) Restructuring, Transaction and Other Charges (3) (152,396) (197,884) (350,394) Total U.S. GAAP Operating Profit 1,075,237 917,850 688,089 Total Other (Expense) Income, net (4) (158,558) (41,503) 7,513 Earnings from Continuing Operations Before Taxes $ 916,679 $ 876,347 $ 695,602 (1) Includes $19.5 million, net, in charges related to a legal settlement for the year ended October 1, 2021. (2) Other corporate expenses include intangibles amortization of $203.9 million, $198.6 million and $149.8 million for the years ended September 29, 2023, September 30, 2022 and October 1, 2021, respectively, with the comparative increase from fiscal 2021 to fiscal 2022 mainly attributable to higher amortization from the PA Consulting investment. Additionally, fiscal 2023 included approximately $15.0 million in net favorable impacts from cost reductions compared to the prior year period, which was associated mainly with net favorable impacts during first quarter from changes in employee benefit programs of $41.0 million offset by approximately $26.0 million in higher spend in company technology platforms and other personnel and corporate cost increases. (3) Fiscal 2023 includes $63.4 million relating to the activities (mainly professional services and employee separation costs, spread across all segments) around the CMS separation and $14.3 million in restructuring and other charges relating to the Company's investment in PA Consulting (primarily employee separation costs). Included in the years ended September 29, 2023, September 30, 2022 and October 1, 2021 were $48.2 million, $78.3 million and $2.4 million, respectively, in charges associated mainly with real estate impairments. Included in the year ended September 30, 2022 is $91.3 million pre-tax re lated to the final settlement of the Legacy CH2M Matter and net of previously recorded reserve s and approximately $27 million in third party recoveries that was recorded as receivables reducing SG&A . Included in the year ended October 1, 2021 is $297.8 million of costs incurred in connection with the investment in PA Consulting, in part classified as compensation costs. (4) The year ended September 30, 2022 included a $13.9 million gain related to a cost method investment sold during the period and a gain of $8.7 million related to lease terminations. The year ended October 1, 2021 included $34.7 million in fa ir value adjustments related to our investment in Worley stock (net of Worley stock div idends) and certain foreign currency r evaluations relating to ECR sale proceeds, $(38.5) million related to impairment of our AWE Management Ltd. investment and $49.6 million in fair value adjustments related to our investment in C3 stock. The investments in Worley and C3 were sold in fiscal 2021 and therefore there are no comparable amounts in fiscal 2022 or 2023. Additionally, the increase in net interest expense from fiscal 2021 to fiscal 2022 is primarily due to the higher levels of debt outstanding due to the funding of the StreetLight and BlackLynx acquisitions and increased borrowings associated with the payment of the Legacy CH2M Matter settlement in fiscal 2022, in addition to higher interest rates. The increase in net interest expense from fiscal 2022 to fiscal 2023 is due primarily to higher interest rates. 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 our incentive compensation plans relating to corporate personnel whose other compensation costs are not allocated to the LOBs; (iii) the amortization of intangible assets acquired as part of 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, as well as other items, where it has been determined that such adjustments are not indicative of the performance of the related LOB.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Pay vs Performance Disclosure
Net earnings attributable to Jacobs from continuing operations	$ 665,777	$ 644,039	$ 477,030

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Sep. 29, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Sep. 29, 2023
Accounting Policies [Abstract]
Revenue Accounting For Contracts	Revenue Accounting for Contracts Engineering, Procurement & Construction Contracts, Service Contracts and Software Contracts The Company recognizes engineering, procurement, and construction contract revenue over time, as performance obligations are satisfied, due to the continuous transfer of control to the customer in accordance with ASC Topic 606, Revenue from Contracts with Customers . Contracts which include engineering, procurement and construction services are generally accounted for as a single deliverable (a single performance obligation) and are no longer segmented between types of services. In some instances, the Company’s services associated with a construction activity are limited to specific tasks such as customer support, consulting or supervisory services. In these instances, the services are typically identified as separate performance obligations. The Company recognizes revenue using the percentage-of-completion method, based primarily on contract costs incurred to date compared to total estimated contract costs. The percentage-of-completion method (an input method) is the most representative depiction of the Company’s performance because it directly measures the value of the services transferred to the customer. Subcontractor materials, labor and equipment and, in certain cases, customer-furnished materials and labor and equipment are included in revenue and cost of revenue when management believes that the company is acting as a principal rather than as an agent (e.g., the company integrates the materials, labor and equipment into the deliverables promised to the customer or is otherwise primarily responsible for fulfillment and acceptability of the materials, labor and/or equipment). The Company recognizes revenue, but not profit, on certain uninstalled materials that are not specifically produced, fabricated, or constructed for a project. Revenue on these uninstalled materials is recognized when control is transferred. Changes to total estimated contract cost or losses, if any, are recognized in the period in which they are determined as assessed at the contract level. Pre-contract costs are expensed as incurred unless they are expected to be recovered from the client. Project mobilization costs are generally charged to project costs as incurred when they are an integrated part of the performance obligation being transferred to the client. Under the typical payment terms of our engineering, procurement and construction contracts, amounts are billed as work progresses in accordance with agreed-upon contractual terms at periodic intervals (e.g., biweekly or monthly) and customer payments are typically due within 30 to 60 days of billing, depending on the contract. For service contracts, the Company recognizes revenue over time using the cost-to-cost percentage-of-completion method. Service contracts that include multiple performance obligations are segmented between types of services. For contracts with multiple performance obligations, the Company allocates the transaction price to each performance obligation using an estimate of the stand-alone selling price of each distinct service in the contract. In some instances where the Company is standing ready to provide services, the Company recognizes revenue ratably over the service period. Under the typical payment terms of our service contracts, amounts are billed as work progresses in accordance with agreed-upon contractual terms, and customer payments are typically due within 30 to 60 days of billing, depending on the contract. Revenue for certain contracts related to the sale of software licenses is recognized at a point in time, typically at the time of delivery, in accordance with ASC 606. The software license sale will be treated as a performance obligation separate and distinct from any related service and maintenance. Direct costs of contracts include all costs incurred in connection with and directly for the benefit of client contracts, including depreciation and amortization relating to assets used in providing the services required by the related projects. The level of direct costs of contracts may fluctuate between reporting periods due to a variety of factors, including the amount of pass-through costs we incur during a period. On those projects where we are acting as principal for subcontract labor or third-party materials and equipment, we reflect the amounts of such items in both revenues and costs (and we refer to such costs as “pass-through costs”). Back charges to suppliers or subcontractors are recognized as a reduction of cost when it is determined that recovery of such cost is probable and the amounts can be reliably estimated. Disputed back charges are recognized when the same requirements described above have been satisfied. Variable Consideration The nature of the Company’s contracts gives rise to several types of variable consideration, including claims and unpriced change orders; awards and incentive fees; and liquidated damages and penalties. The Company recognizes revenue for variable consideration when it is probable that a significant reversal in the amount of cumulative revenue recognized will not occur. The Company estimates the amount of revenue to be recognized on variable consideration using the expected value (i.e., the sum of a probability-weighted amount) or the most likely amount method, whichever is expected to better predict the amount. Factors considered in determining whether revenue associated with claims (including change orders in dispute and unapproved change orders in regard to both scope and price) should be recognized include the following: (a) the contract or other evidence provides a legal basis for the claim, (b) additional costs were caused by circumstances that were unforeseen at the contract date and not the result of deficiencies in the company’s performance, (c) claim-related costs are identifiable and considered reasonable in view of the work performed, and (d) evidence supporting the claim is objective and verifiable. If the requirements for recognizing revenue for claims or unapproved change orders are met, revenue is recorded only when the costs associated with the claims or unapproved change orders have been incurred and only up to the amount of cost incurred which generally represents the amount of consideration that is not probable of reversal. The Company generally provides limited warranties for work performed under its engineering and construction contracts. The warranty periods typically extend for a limited duration following substantial completion of the Company’s work on the project. Historically, warranty claims have not resulted in material costs incurred for which the Company was not compensated for by the customer. See Note 3- Revenue Accounting for Contracts for further discussion. Joint Ventures and VIEs As is common to the industry, we execute certain contracts jointly with third parties through various forms of joint ventures. 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. Many of these joint ventures are formed for a specific project. The assets of our joint ventures generally consist almost entirely of cash and receivables (representing amounts due from clients), and the liabilities of our joint ventures generally 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 or third-party debt or credit facilities. The debt held by the joint ventures is non-recourse to the general credit of Jacobs. The assets of a joint venture are restricted for use to the obligations of the particular joint venture and are not available for general operations of the Company. Our risk of loss on these arrangements is usually shared with our partners. The liability of each partner is usually joint and several, which means that each partner may become liable for the entire risk of loss on the project. Furthermore, on some of our projects, the Company has granted guarantees which may encumber both our contracting subsidiary company and the Company for the entire risk of loss on the project. The Company is unable to estimate the maximum potential amount of future payments that we could be required to make under outstanding performance guarantees related to joint venture projects due to a number of factors, including but not limited to, the nature and extent of any contractual defaults by our joint venture partners, resource availability, potential performance delays caused by the defaults, the location of the projects, and the terms of the related contracts. See Note 18 - Contractual Guarantees, Litigation, Investigations and Insurance for further discussion. Most of the joint ventures are deemed to be variable interest entities (“VIE”) because they lack sufficient equity to finance the activities of the joint venture. The Company uses a qualitative approach to determine if the Company is the primary beneficiary of the VIE, which considers factors that indicate a party has the power to direct the activities that most significantly impact the joint venture’s economic performance. These factors include the composition of the governing board, how board decisions are approved, the powers granted to the operational manager(s) and partner that holds that position(s), and to a certain extent, the partner’s economic interest in the joint venture. The Company analyzes each joint venture initially to determine if it should be consolidated or unconsolidated. • Consolidated if the Company is the primary beneficiary of a VIE or holds the majority of voting interests of a non-VIE (and no significant participative rights are available to the other partners). • Unconsolidated if the Company is not the primary beneficiary of a VIE or does not hold the majority of voting interest of a non-VIE. Our unconsolidated joint ventures (including equity method investments) are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the investment might not be recoverable, and impairment losses are recognized for such investments if there is a decline in fair value below carrying value that is considered to be other-than-temporary.
Fair Value Measurements	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. The net carrying amounts of cash and cash equivalents, trade receivables and payables and short-term debt approximate fair value due to the short-term nature of these instruments. See Note 9- Borrowings for a discussion of the fair value of long-term debt. Certain other assets and liabilities, such as forward contracts and interest rate swap agreements we purchased as cash-flow hedges discussed in Note 17 - Commitments and Contingencies and Derivative Financial Instruments are required to be carried in our Consolidated Financial Statements at Fair Value. The fair value of the Company’s reporting units (used for purposes of determining whether there is an impairment of the carrying value of goodwill) is determined using an income and market approach. Both approaches require us to make certain estimates and judgments. Under the income approach, fair value is determined by using the discounted cash flows of our reporting units. Under the market approach, the fair values of our reporting units are determined by reference to guideline companies that are reasonably comparable to our reporting units; the fair values are estimated based on the valuation multiples of earnings before taxes, interest, depreciation and amortization associated with the guideline companies. In assessing whether the carrying value of goodwill has been impaired, we utilize the results of both valuation techniques and consider the range of fair values indicated. With respect to equity-based compensation (i.e., share-based payments), we estimate the fair value of stock options granted to employees and directors using the Black-Scholes option-pricing model. Like all option-pricing models, the Black-Scholes model requires the use of subjective assumptions including (i) the expected volatility of the market price of the underlying stock, and (ii) the expected term of the award, among others. Accordingly, changes in assumptions and any subsequent adjustments to those assumptions can cause different fair values to be assigned to our future stock option awards. For restricted stock awards (including restricted stock units) containing market conditions, compensation expense is based on the fair value of such awards using a Monte Carlo simulation. For restricted stock awards (including restricted stock units) containing service and performance conditions, fair value is based on the closing stock price on the date of grant, adjusted for the expected level of achievement for any performance conditions. The fair values of the assets owned by the various pension plans that the Company sponsors are determined based on the type of asset, consistent with U.S. GAAP. Equity securities are valued by using market observable data such as quoted prices. Publicly traded corporate equity securities are valued at the last reported sale price on the last business day of the year. Securities not traded on the last business day are valued at the last reported bid price. Fixed income investment funds categorized as Level 2 are valued by the trustee using pricing models that use verifiable observable market data (e.g., interest rates and yield curves observable at commonly quoted intervals), bids provided by brokers or dealers, or quoted prices of securities with similar characteristics. Real estate consists primarily of common or collective trusts, with underlying investments in real estate. These investments are valued using the best information available, including quoted market price, market prices for similar assets when available, internal cash flow estimates discounted at an appropriate interest rate, or independent appraisals, as appropriate. Management values insurance contracts and hedge funds using actuarial assumptions and certain values reported by fund managers. Fair value measurements relating to our business combinations are made primarily using Level 3 inputs including discounted cash flow and to the extent applicable, Monte Carlo simulation techniques. Fair value for the identified intangible assets is generally estimated using inputs primarily for the income approach using the multiple period excess earnings method and the relief from royalties method. The significant assumptions used in estimating fair value include (i) revenue projections of the business, including profitability, (ii) attrition rates and (iii) the estimated discount rate that reflects the level of risk associated with receiving future cash flows. 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. The fair value of the contingent consideration is estimated using a Monte Carlo simulation and the significant assumptions used include projections of revenues and probabilities of meeting those projections. Key inputs to the valuation of the noncontrolling interests include projected cash flows and the expected volatility associated with those cash flows. The fair values for the asset groups relating to the impairment assessment of long-lived assets (see Note 10, Leases ) were estimated primarily using discounted cash flow models (income approach) with Level 3 inputs. The significant assumptions used in estimating fair value include the expected downtime prior to the commencement of future subleases, projected sublease income over the remaining lease periods and discount rates that reflects the level of risk associated with receiving future cash flows. The methodologies described above and elsewhere in these Notes to Consolidated Financial Statements may produce a fair value measure that may not be indicative of net realizable value or reflective of future fair values. Furthermore, while the Company believes Level 3 valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement.
Cash Equivalents	Cash EquivalentsWe consider all highly liquid investments with original maturities of less than three months to be cash equivalents.
Receivables and Billings In Excess of Costs	Receivables, Contract Assets and Contract Liabilities Receivables include amounts billed, net and unbilled receivables. 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, which represent an unconditional right to payment subject only to the passage of time in connection with our client contracts, are reclassified to amounts billed when they are billed under the terms of the contract. We anticipate that substantially all of such unbilled amounts will be billed and collected over the next twelve months. Contract assets represent unbilled amounts where the right to payment is subject to more than merely the passage of time and includes performance-based incentives and services provided ahead of agreed contractual milestones. Contract assets are transferred to unbilled receivables when the right to consideration becomes unconditional and are transferred to amounts billed upon invoicing. Contract liabilities represent amounts billed to clients in excess of revenue recognized to date. We anticipate that substantially all such amounts will be earned over the next twelve months.
Property, Equipment and Improvements	Property, Equipment, and Improvements Property, equipment and improvements are carried at cost, and are shown net of accumulated depreciation and amortization in the accompanying Consolidated Balance Sheets. Depreciation and amortization is computed primarily by using the straight-line method over the estimated useful lives of the assets. The cost of leasehold improvements is amortized using the straight-line method over the lesser of the estimated useful life of the asset or the remaining term of the related lease. Estimated useful lives range from 20 to 40 years for buildings, from 3 to 10 years for equipment and from 2 to 20 years for leasehold improvements.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill represents the excess of the cost of an acquired business over the fair value of the net tangible and intangible assets acquired. Goodwill and intangible assets with indefinite lives are not amortized; instead, on an annual basis we test goodwill and intangible assets with indefinite lives for possible impairment. Intangible assets with finite lives are amortized on a straight-line basis over the useful lives of those assets. For purposes of impairment testing, goodwill is assigned to the applicable reporting units based on the current reporting structure. We have determined that our operating segments are also our reporting units based on management’s conclusion that the components comprising each of our operating segments share similar economic characteristics and meet the aggregation criteria in accordance with ASC 350. We perform our annual goodwill impairment assessment as of the first day of the fourth fiscal quarter each year. We begin with the qualitative assessment of whether it is more likely than not that a reporting unit’s fair value is less than its carrying value before applying the quantitative assessment described below. If it is determined through the evaluation of events or circumstances that the carrying value may not be recoverable, the Company then compares the fair value of the related reporting unit with its carrying amount. If the carrying amount of a reporting unit exceeds its fair value, an impairment loss is recognized
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets Our long-lived assets other than goodwill principally consist of right-of-use (ROU) lease assets, property, equipment and improvements, and finite-lived intangible assets. These long-lived assets are evaluated for impairment for each of our asset groups in accordance with ASC 360 by first identifying whether indicators of impairment exist. If such indicators are present, we assess long-lived asset groups for recoverability based on estimated future undiscounted cash flows. For asset groups where the recoverability test fails, the fair value of each asset group is then estimated and compared to its carrying amount. An impairment loss is recognized for the amount by which an asset group’s carrying value exceeds its fair value.
Foreign Currencies	Foreign Currencies In preparing our Consolidated Financial Statements, it is necessary to translate the financial statements of our subsidiaries operating outside the U.S., which are denominated in currencies other than the U.S. dollar, into the U.S. dollar. In accordance with U.S. GAAP, revenues and expenses of operations outside the U.S. are translated into U.S. dollars using weighted-average exchange rates for the applicable periods being translated while the assets and liabilities of operations outside the U.S. are generally translated into U.S. dollars using period-end exchange rates. The net effect of foreign currency translation adjustments is included in stockholders’ equity as a component of accumulated other comprehensive income (loss) in the accompanying Consolidated Balance Sheets.
Share-based Payments	Share-Based Payments We measure the value of services received from employees and directors in exchange for an award of an equity instrument based on the grant-date fair value of the award. The fair value is recognized as a non-cash cost on a straight-line basis over the period the individual provides services, which is typically the vesting period of the award with the exception of awards containing an internal performance measure, such as Earnings Per Share growth and Return on Invested Capital, which is recognized on a straight-line basis over the vesting period subject to the probability of meeting the performance requirements and adjusted for the number of shares expected to be earned. The cost of these awards is recorded in selling, general and administrative expense in the accompanying Consolidated Statements of Earnings.
Concentration of Credit Risk	Concentrations of Credit Risk Our cash balances and cash equivalents are maintained in accounts held by major banks and financial institutions located in North America, South America, Europe, the Middle East, India, Australia, Africa and Asia. In the normal course of business, and consistent with industry practices, we grant credit to our clients without requiring collateral. Concentrations of credit risk is the risk that, if we extend a significant amount of credit to clients in a specific geographic area or industry, we may experience disproportionately high levels of default if those clients are adversely affected by factors particular to their geographic area or industry. Concentrations of credit risk relative to trade receivables are limited due to our diverse client base, which includes the U.S. federal government and multi-national corporations operating in a broad range of industries and geographic areas. Additionally, in order to mitigate credit risk, we continually evaluate the credit worthiness of our major commercial clients.
Leases	Leases The Company accounts for its leases in accordance with ASC 842, Leases ("ASC 842") . ASC 842 requires lessees to recognize assets and liabilities for most leases. The Company determines if an arrangement is a lease at contract inception. A lease exists when a contract conveys to the customer the right to control the use of an identified asset for a period of time in exchange for consideration. The definition of a lease embodies two conditions: (1) there is an identified asset in the contract, and (2) the customer has the right to control the use of the identified asset. Lessees are required to classify leases as either finance or operating leases. This classification will determine whether lease expense is recognized based on an effective interest method or on a straight-line basis over the term of the lease. ASC 842 provided several optional practical expedients for use in transition to and ongoing application of ASC 842. The Company elected to utilize the package of practical expedients in ASC 842-10-65-1(f) that, upon adoption of ASC 842, allows entities to (1) not reassess whether any expired or existing contracts are or contain leases, (2) retain the classification of leases (e.g., operating or finance lease) existing as of the date of adoption and (3) not reassess initial direct costs for any existing leases. The Company did not elect the practical expedient pertaining to the use of hindsight. The Company elected to utilize the practical expedient in ASC 842-10-15-37 in which the Company has chosen to account for each separate lease component of a contract and its associated non-lease components as a single lease component. The Company’s right-of use assets and lease liabilities relate to real estate, project assets used in connection with long-term construction contracts, IT assets and vehicles. The Company’s leases have remaining lease terms of less than one year to twenty years. The Company’s lease obligations are primarily for the use of office space and are primarily operating leases. Certain of the Company’s leases contain renewal, extension, or termination options. The Company assesses each option on an individual basis and will only include options reasonably certain of exercise in the lease term. The Company generally considers the base term to be the term provided in the contract. None of the Company’s lease agreements contain material options to purchase the leased property, material residual value guarantees, or material restrictions or covenants. Long-term project asset and vehicle leases (leases with terms greater than twelve months), along with all real estate and IT asset leases, are recorded on the consolidated balance sheet at the present value of the minimum lease payments not yet paid. Because the Company primarily acts as a lessee and the rates implicit in its leases are not readily determinable, the Company generally uses its incremental borrowing rate on the lease commencement date to calculate the present value of future lease payments. Certain leases include payments that are based solely on an index or rate. These variable lease payments are included in the calculation of the ROU asset and lease liability and are initially measured using the index or rate at the lease commencement date. Other variable lease payments, such as payments based on use and for property taxes, insurance, or common area maintenance that are based on actual assessments are excluded from the ROU asset and lease liability and are expensed as incurred. In addition to the present value of the future lease payments, the calculation of the ROU asset also includes any deferred rent, lease prepayments and initial direct costs of obtaining the lease, such as commissions. Certain lease contracts contain non-lease components such as maintenance and utilities. The Company has made an accounting policy election, as allowed under ASC 842-10-15-37 and discussed above, to capitalize both the lease component and non-lease components of its contracts as a single lease component for all of its right-of-use assets. Short-term project asset and vehicle leases (project asset and vehicle leases with an initial term of twelve months or less or leases that are cancellable by the lessee and lessor without significant penalties) are not recorded on the consolidated balance sheet and are expensed on a straight-line basis over the lease term. The majority of the Company’s short-term leases relate to equipment used on construction projects. These leases are entered into at agreed upon hourly, daily, weekly or monthly rental rates for an unspecified duration and typically have a termination for convenience provision. Such equipment leases are considered short-term in nature unless it is reasonably certain that the equipment will be leased for a term greater than twelve months.
Pensions	Pensions We use certain assumptions and estimates in order to calculate periodic pension cost and the value of the assets and liabilities of our pension plans. These assumptions involve discount rates, investment returns, and projected salary increases, among others. Changes in the actuarial assumptions may have a material effect on the plans’ liabilities and the projected pension expense. We measure our defined benefit plan assets and obligations as of the end of the month closest to their fiscal year end, which is September 30, 2023 as the alternative measurement date in accordance with FASB guidance ASU 2015-04, Compensation Retirement Benefit (Topic 715): Practical Expedient for the Measurement Date of an Employer’s Defined Benefit Obligation and Plan Asset
Redeemable Noncontrolling Interests	Redeemable Noncontrolling Interests In connection with the PA Consulting investment in March 2021, the Company recorded redeemable noncontrolling interests, representing the interest holders' 35% equity interest in the form of preferred and common shares of PA Consulting. The preferred shares are entitled to a cumulative annual compounding 12% dividend based on the outstanding preferred share subscription price. These noncontrolling interest holders have certain option rights to put the preferred and common share interests back to the Company at a value based on the fair value of PA Consulting (the redemption values). The primary inputs and assumptions impacting the fair value of PA Consulting include projections of revenue and earnings before interest, taxes, depreciation and amortization and discount rates applied thereto. Additionally, the Company has an option to call the interests for certain individual shareholders in certain circumstances. Because the interests are redeemable at the option of the holders and not solely within the control of the Company, the Company classified the interests in redeemable noncontrolling interests within its Consolidated Balance Sheet at their redemption values. The optional redemption features may become exercisable no earlier than five years from the March 2, 2021 closing date, or upon the occurrence of certain other events. The Company has deemed these interests probable of becoming redeemable in the future and requiring their measurement at the greater of (i) the redemption amount that would be paid if settlement occurred at the balance sheet date, or (ii) the historical value resulting from the original acquisition date fair value plus the impact of any earnings or loss attribution amounts, including dividends. The fair value of the PA Consulting redeemable noncontrolling interest is determined using a combination of the income and market approaches. Under the income approach, fair value is determined by using the projected discounted cash flows of PA Consulting. Under the market approach, the fair value is determined by reference to guideline companies that are reasonably comparable to PA Consulting; the fair value is estimated based on the valuation multiples of earnings before interest, taxes, depreciation and amortization.
Income Taxes	Income Taxes We determine our consolidated income tax expense using the asset and liability method prescribed by U.S. GAAP. Under this method, deferred tax assets and liabilities are recognized for the temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and income tax purposes. Such deferred tax assets and liabilities are adjusted, as appropriate, to reflect changes in tax rates expected to be in effect when the temporary differences reverse. If and when we determine that a deferred tax asset will not be realized for its full amount, we will recognize and record a valuation allowance with a corresponding charge to earnings. Judgment is required in determining our provision for income taxes. In the normal course of business, we may engage in numerous transactions every day for which the ultimate tax outcome (including the period in which the transaction will ultimately be included in taxable income or deducted as an expense) is uncertain. Additionally, we file income, franchise, gross receipts and similar tax returns in many jurisdictions. Our tax returns are subject to audit and investigation by the Internal Revenue Service, most states in the U.S., and by various government agencies representing many jurisdictions outside the U.S.
Contractual Guarantees, Litigation, Investigations and Insurance	Contractual Guarantees, Litigation, Investigations and Insurance In the normal course of business, we are subject to certain contractual guarantees and litigation. We record in the Consolidated Balance Sheets amounts representing our estimated liability relating to such guarantees, litigation and insurance claims. Guarantees are accounted for in accordance with ASC 460-10, Guarantees , at fair value at the inception of the guarantee. We perform an analysis to determine the level of reserves to establish for both 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 Statements of Earnings. In addition, as a contractor providing services to various agencies of the U.S. federal government, we are subject to many levels of audits, investigations, and claims by, or on behalf of, the U.S. federal government with respect to contract performance, pricing, costs, cost allocations and procurement practices. We adjust revenues based upon the amounts we expect to realize considering the effects of any client audits or governmental investigations.
Business Combinations	Business Combinations U.S. GAAP requires that the purchase price paid for business combinations accounted for using the acquisition method be allocated to the assets and liabilities acquired based on their respective fair values. The Company makes certain estimates and judgments relating to other assets and liabilities acquired as well as any identifiable intangible assets acquired.
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 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.
New Accounting Pronouncements	New Accounting Pronouncements ASU 2020-04, Reference Rate Reform, (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting is intended to provide relief for entities impacted by reference rate reform and contains provisions and optional expedients designed to simplify requirements around designation of hedging relationships, probability assessments of hedged forecasted transactions and accounting for modifications of contracts that refer to LIBOR or other rates affected by reference rate reform. The guidance is elective and is effective on the date of issuance. ASU 2020-04 is applied prospectively to contract modifications and as of the effective date for existing and new eligible hedging relationships. The guidance was amended by ASU 2022-06, Reference Rate Reform, (Topic 848): Deferral of the Sunset Date of Topic 848 to defer the original sunset date of December 31, 2022 to December 31, 2024. The adoption of the new guidance in the first quarter of fiscal 2022 allowed the Company to continue its British pound denominated interest rate hedge relationships which previously defined LIBOR as the benchmark interest rate and were amended to replace LIBOR with the Sterling Overnight Index Average rate ("SONIA") in the first quarter of fiscal 2022 and its U.S. dollar denominated interest rate hedge relationships which previously defined LIBOR as the benchmark interest rate and were amended to replace LIBOR with the Secured Overnight Financing Rate ("SOFR") in the second quarter of fiscal 2023.

Description of Business and B_2

Description of Business and Basis of Presentation (Tables)	12 Months Ended
	Sep. 29, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Revenues Realized from Each of These Types of Contracts	The percentage of revenues realized from each of these types of contracts for the fiscal years ended September 29, 2023, September 30, 2022 and October 1, 2021 was as follows: For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 Cost-reimbursable 74.1% 74% 76% Fixed-price 25.9% 26% 24%

Revenue Accounting for Contra_2

Revenue Accounting for Contracts and Adoption of ASC Topic 606 (Tables)	12 Months Ended
	Sep. 29, 2023
Revenue from Contract with Customer [Abstract]
Schedule of Disaggregation of Revenue	The following table further disaggregates our revenue by geographic area for the years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 Revenues: United States $ 10,963,072 $ 9,875,252 $ 9,671,281 Europe 3,598,140 3,488,317 3,140,114 Canada 268,466 269,386 227,692 Asia 135,359 140,663 114,118 India 164,212 114,235 70,772 Australia and New Zealand 696,870 706,283 647,866 Middle East and Africa 526,295 328,689 220,789 Total $ 16,352,414 $ 14,922,825 $ 14,092,632
Schedules of Concentration of Risk	The following table presents the revenues earned directly or indirectly from the U.S. federal government and its agencies, expressed as a percentage of total revenues: For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 31% 31% 33%

Earnings Per Share and Certai_2

Earnings Per Share and Certain Related Information (Tables)	12 Months Ended
	Sep. 29, 2023
Earnings Per Share Reconciliation [Abstract]
Schedule of Compute Basic and Diluted of EPS	The following table reconciles the denominator used to compute basic EPS to the denominator used to compute diluted EPS for the years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 Numerator for Basic and Diluted EPS: Net earnings attributable to Jacobs from continuing operations $ 666,619 $ 644,071 $ 467,022 Preferred Redeemable Noncontrolling interests redemption value adjustment (See Note 14- PA Consulting Business Combination ) 8,340 — (57,307) Net earnings from continuing operations allocated to common stock for EPS calculation $ 674,959 $ 644,071 $ 409,715 Net (loss) earnings from discontinued operations allocated to common stock for EPS calculation $ (842) $ (32) $ 10,008 Net earnings allocated to common stock for EPS calculation $ 674,117 $ 644,039 $ 419,723 Denominator for Basic and Diluted EPS: Shares used for calculating basic EPS attributable to common stock 126,607 128,665 130,194 Effect of dilutive securities: Stock compensation plans 607 780 1,080 Shares used for calculating diluted EPS attributable to common stock 127,214 129,445 131,274 Net Earnings Per Share: Basic Net Earnings from Continuing Operations Per Share $ 5.33 $ 5.01 $ 3.15 Basic Net (Loss) Earnings from Discontinued Operations Per Share $ (0.01) $ — $ 0.08 Basic Earnings Per Share: $ 5.32 $ 5.01 $ 3.22 Diluted Net Earnings from Continuing Operations Per Share $ 5.31 $ 4.98 $ 3.12 Diluted Net (Loss) Earnings from Discontinued Operations Per Share $ (0.01) $ — $ 0.08 Diluted Earnings Per Share: $ 5.30 $ 4.98 $ 3.20 Note: Earnings per share amounts may not add due to rounding
Schedule of Share Repurchases Activity	The following table summarizes repurchase activity under the 2020 Repurchase Authorization during fiscal 2023 through expiration during the second fiscal quarter of 2023: Amount Authorized Average Price Per Share (1) Shares Repurchased Total Shares Retired $1,000,000,000 $113.56 1,237,688 1,237,688 (1) Includes commissions paid and excise tax due under the Inflation Reduction Act of 2022 and calculated at the average price per share. The following table summarizes the activity under the 2023 Repurchase Authorization during fiscal 2023: Amount Authorized Average Price Per Share (1) Shares Repurchased Total Shares Retired $1,000,000,000 $115.04 1,088,012 1,088,012 (1) Includes commissions paid and excise tax due under the Inflation Reduction Act of 2022 and calculated at the average price per share.
Schedule of Dividends Paid	Dividends paid through September 29, 2023 and the preceding fiscal year are as follows: Declaration Date Record Date Payment Date Cash Amount (per share) July 6, 2023 July 28, 2023 August 25, 2023 $0.26 April 27, 2023 May 26, 2023 June 23, 2023 $0.26 January 25, 2023 February 24, 2023 March 24, 2023 $0.26 September 15, 2022 September 30, 2022 October 28, 2022 $0.23 July 13, 2022 July 29, 2022 August 26, 2022 $0.23 April 28, 2022 May 27, 2022 June 24, 2022 $0.23 January 26, 2022 February 25, 2022 March 25, 2022 $0.23

Goodwill and Intangibles (Table

Goodwill and Intangibles (Tables)	12 Months Ended
	Sep. 29, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Carrying Value of Goodwill by Reportable Segment Appearing in Accompanying Consolidated Balance Sheets	The carrying value of goodwill associated with continuing operations and appearing in the accompanying Consolidated Balance Sheets September 29, 2023 and September 30, 2022 was as follows (in thousands): Critical Mission Solutions People & Places Solutions Divergent Solutions PA Consulting Total Balance September 30, 2022 $ 2,251,724 $ 3,196,796 $ 576,986 $ 1,159,152 $ 7,184,658 Acquired — — — 11,956 11,956 Post-Acquisition Adjustments — (138) — 877 739 Foreign currency translation and other (6,739) 11,535 18,726 122,651 146,173 Balance September 29, 2023 $ 2,244,985 $ 3,208,193 $ 595,712 $ 1,294,636 $ 7,343,526
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 for the year ended September 29, 2023 (in thousands): Customer Relationships, Contracts and Backlog Developed Technology Trade Names Total Balances, September 30, 2022 $ 1,136,438 $ 88,931 $ 168,683 $ 1,394,052 Amortization (177,821) (15,695) (10,390) (203,906) Acquired 5,537 — — 5,537 Post Acquisition Adjustments (1,409) — — (1,409) Foreign currency translation and other 59,656 1,555 16,458 77,669 Balances, September 29, 2023 $ 1,022,401 $ 74,791 $ 174,751 $ 1,271,943 Weighted Average Amortization Period (years) 7 6 17 8
Schedule of Estimated Amortization Expense of Intangible Assets	The following table presents estimated amortization expense of intangible assets for fiscal 2024 and for the succeeding years. Fiscal Year (in millions) 2024 $ 203.3 2025 202.7 2026 180.1 2027 148.7 2028 140.8 Thereafter 396.3 Total $ 1,271.9

Other Financial Information (Ta

Other Financial Information (Tables)	12 Months Ended
	Sep. 29, 2023
Other Financial Information [Abstract]
Schedule of Components of Receivables and Contract Assets	The following table presents the components of receivables and contract assets appearing in the accompanying Consolidated Balance Sheets at September 29, 2023 and September 30, 2022 as well as certain other related information (in thousands): September 29, 2023 September 30, 2022 Components of receivables: Amounts billed, net $ 1,457,333 $ 1,400,088 Unbilled receivables and other 1,442,486 1,523,249 Contract assets 658,987 482,044 Total receivables and contract assets, net $ 3,558,806 $ 3,405,381 Other information about receivables: Amounts due from the United States federal government included above, net of contract liabilities $ 802,566 $ 749,323
Schedule of Property, Equipment and Improvements, Net	The following table presents the components of our property, equipment and improvements, net at September 29, 2023 and September 30, 2022 (in thousands): September 29, 2023 September 30, 2022 Land $ 477 $ 478 Buildings 62,380 46,244 Equipment 719,167 643,805 Leasehold improvements 190,257 179,187 Construction in progress 28,355 34,880 1,000,636 904,594 Accumulated depreciation and amortization (643,604) (557,918) $ 357,032 $ 346,676
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country	The following table presents our property, equipment and improvements, net by geographic area for the years ended September 29, 2023 and September 30, 2022 (in thousands): For the Years Ended September 29, 2023 September 30, 2022 Property, equipment and improvements, net: United States $ 203,358 $ 226,639 Europe 108,587 87,331 Canada 4,812 5,210 Asia 3,775 2,578 India 12,583 9,659 Australia and New Zealand 15,406 13,211 Middle East and Africa 8,511 2,048 Total $ 357,032 $ 346,676
Schedule of Components of Accrued Liabilities	The following table presents the components of accrued liabilities shown in the accompanying Consolidated Balance Sheets at September 29, 2023 and September 30, 2022 (in thousands): September 29, 2023 September 30, 2022 Accrued payroll and related liabilities $ 842,815 $ 947,547 Project-related accruals 27,814 28,178 Non project-related accruals and other 222,938 279,062 Insurance liabilities 63,536 63,183 Sales and other similar taxes 110,199 93,500 Dividends payable 34,342 30,292 Total $ 1,301,644 $ 1,441,762
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table presents the Company's roll forward of accumulated income (loss) after-tax for the years ended September 29, 2023 and September 30, 2022 (in thousands): Change in Pension and Retiree Medical Plan Liabilities Foreign Currency Translation Adjustment (1) Gain/(Loss) on Cash Flow Hedges (2) Total Balance at October 1, 2021 $ (394,561) $ (407,240) $ 7,359 $ (794,442) Other comprehensive income (loss) 87,034 (378,800) 108,555 (183,211) Reclassifications from other comprehensive income (loss) 132 — 2,391 2,523 Balance at September 30, 2022 $ (307,395) $ (786,040) $ 118,305 $ (975,130) Other comprehensive income (loss) (18,485) 150,103 15,006 146,624 Reclassifications from other comprehensive income (loss) 188 — (29,636) (29,448) Balance at September 29, 2023 $ (325,692) $ (635,937) $ 103,675 $ (857,954) (1) Included in the overall foreign currency translation adjustment for the years ended September 29, 2023 and September 30, 2022 is $(67.5) million and $144.3 million, respectively, in unrealized gains (losses) on long-term foreign currency denominated intercompany loans not anticipated to be settled in the foreseeable future. (2) Included in the Company’s cumulative net unrealized gains from interest rate swaps recorded in accumulated other comprehensive income as of September 29, 2023 were approximately $22.6 million in unrealized gains, net of taxes, which are expected to be realized in earnings during the twelve months subsequent to September 29, 2023.

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Sep. 29, 2023
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense	The following table presents the components of our consolidated income taxes for continuing operations for years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 Current income tax (benefit) expense from continuing operations: Federal $ 70,895 $ (35,291) $ 91,313 State 31,046 4,526 30,886 Foreign 171,055 79,822 38,959 Total current tax expense from continuing operations 272,996 49,057 161,158 Deferred income tax expense (benefit) from continuing operations: Federal (29,748) 56,526 35,109 State 2,448 17,178 21,826 Foreign (49,515) 38,142 56,688 Total deferred tax expense from continuing operations (76,815) 111,846 113,623 Consolidated income tax expense from continuing operations $ 196,181 $ 160,903 $ 274,781
Schedule of Components of Deferred Tax Assets	The following table presents the components of our net deferred tax (liabilities) assets at September 29, 2023 and September 30, 2022 (in thousands): September 29, 2023 September 30, 2022 Deferred tax assets: Other employee benefit plans $ 136,648 $ 138,897 Net operating losses 269,412 132,999 Foreign tax credit 68,874 83,697 Lease liability 126,893 138,635 Unrealized foreign exchange loss 32,090 46,005 Other 16,996 11,831 Valuation allowance (200,389) (113,483) Gross deferred tax assets 450,524 438,581 Deferred tax liabilities: Depreciation and amortization (394,332) (431,946) Lease right of use asset (62,640) (71,658) Partnership investment (61,614) (52,787) Hedge investments (34,045) (38,994) Unrealized foreign exchange gain (31,205) (45,754) Other (34,715) (35,039) Gross deferred tax liabilities (618,551) (676,178) Net deferred tax liabilities $ (168,027) $ (237,597)
Income Tax Benefits Realized from the Exercise of Nonqualified Stock Options, and Disqualifying Dispositions of Stock Sold Under our Employee Stock Purchase Plans	The following table presents the income tax benefits from continuing operations realized from the exercise of non-qualified stock options and disqualifying dispositions of stock sold under our employee stock purchase plans for the years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in millions): For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 $ 3.9 $ 2.2 $ 9.9
Schedule of Income Tax Expense in Consolidated Statements of Earnings	The following table reconciles total income tax expense from continuing operations using the statutory U.S. federal income tax rate to the consolidated income tax expense for continuing operations shown in the accompanying Consolidated Statements of Earnings for the years ended September 29, 2023, September 30, 2022 and October 1, 2021 (dollars in thousands): For the Years Ended September 29, 2023 % September 30, 2022 % October 1, 2021 % Statutory amount $ 192,503 21.0 % $ 184,033 21.0 % $ 146,078 21.0 % State taxes, net of the federal benefit 23,901 2.6 % 19,316 2.2 % 14,564 2.1 % Exclusion of tax on non-controlling interests (6,578) (0.7) % (7,533) (0.9) % (7,999) (1.1) % Foreign: Difference in tax rates of foreign operations 7,166 0.8 % (2,516) (0.3) % 3,684 0.5 % Expense/(benefit) from foreign valuation allowance change (1,305) (0.1) % 2,982 0.3 % 2,148 0.3 % Nondeductible compensation — — % — — % 48,727 7.0 % U.S. tax cost (benefit) of foreign operations 78,216 8.5 % 48,843 5.6 % 35,228 5.1 % Tax differential on foreign earnings 84,077 9.2 % 49,309 5.6 % 89,787 12.9 % Foreign tax credits (46,530) (5.1) % (33,734) (3.8) % (25,230) (3.6) % Tax Rate Change (9,913) (1.1) % 3,210 0.4 % 25,588 3.7 % Valuation allowance (7,169) (0.8) % (59,121) (6.7) % 38,928 5.6 % Uncertain tax positions (38,844) (4.2) % (1,439) (0.2) % 978 0.1 % Other items: Energy efficient commercial buildings deduction 736 0.1 % (2,681) (0.3) % (3,760) (0.5) % Disallowed officer compensation 7,081 0.8 % 6,034 0.7 % 6,689 1.0 % Stock compensation (3,896) (0.4) % (2,168) (0.2) % (9,946) (1.4) % Other items – net 813 0.1 % 5,677 0.6 % (896) (0.1) % Total other items 4,734 0.5 % 6,862 0.8 % (7,913) (1.1) % Taxes on income from continuing operations $ 196,181 21.4 % $ 160,903 18.4 % $ 274,781 39.5 %
Schedule of Income Tax Payments	The following table presents income tax payments, net made during the years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in millions): September 29, 2023 September 30, 2022 October 1, 2021 $ 204.2 $ 113.9 $ 75.6
Schedule of Components of our Consolidated Earnings Before Taxes	The following table presents the components of our consolidated earnings from continuing operations before taxes for the years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 United States earnings $ 388,999 $ 415,673 $ 634,820 Foreign earnings 527,680 460,674 60,782 $ 916,679 $ 876,347 $ 695,602
Schedule of Unrecognized Tax Benefits	The following table presents the reconciliation of the beginning and ending amount of unrecognized tax benefits, with StreetLight and PA Consulting related impacts added for the years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 Balance, beginning of year $ 88,893 $ 113,633 $ 102,484 Acquisitions/Divestitures — 192 7,639 Additions based on tax positions related to the current year 1,190 1,136 7,088 Additions for tax positions of prior years 2,537 1,207 1,711 Reductions for tax positions of prior years (53,854) (3,672) (4,851) Settlement — (23,603) (438) Balance, end of year $ 38,766 $ 88,893 $ 113,633

Joint Ventures and VIE's and _2

Joint Ventures and VIE's and Other Investments (Tables)	12 Months Ended
	Sep. 29, 2023
Equity Method Investments and Joint Ventures [Abstract]
Schedule of Summarized Financial Information	Summary financial information of consolidated VIEs is as follows (in millions): September 29, 2023 September 30, 2022 Current assets $ 424.2 $ 353.9 Non-Current assets — — Total assets $ 424.2 $ 353.9 Current liabilities $ 279.8 $ 228.1 Total liabilities $ 279.8 $ 228.1 For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 Revenue $ 1,431.7 $ 1,253.8 $ 1,037.3 Direct cost of contracts (1,106.5) (985.5) (910.1) Gross profit 325.2 268.3 127.2 Net earnings $ 87.3 $ 92.3 $ 84.3

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Sep. 29, 2023
Debt Disclosure [Abstract]
Schedule of Long-term Debt	The following table presents certain information regarding the Company’s long-term debt at September 29, 2023 and September 30, 2022 (dollars in thousands): Interest Rate Maturity September 29, 2023 September 30, 2022 Revolving Credit Facility Benchmark + applicable margin (1) (2) February 2028 $ 10,000 $ 1,105,294 2021 Term Loan Facility - USD Portion Benchmark + applicable margin (1) (3) February 2026 120,000 200,000 2021 Term Loan Facility - GBP Portion Benchmark + applicable margin (1) (3) September 2025 794,170 723,580 2020 Term Loan Facility Benchmark + applicable margin (1) (4) March 2025 (7) 854,246 882,263 Fixed-rate: 5.9% Bonds, due 2033 5.9% (5) March 2033 500,000 — 6.35% Bonds, due 2028 6.35% August 2028 600,000 — Senior Notes, Series A 4.27% May 2025 (6) — 190,000 Senior Notes, Series B 4.42% May 2028 (6) — 180,000 Senior Notes, Series C 4.52% May 2030 (6) — 130,000 Less: Current Portion (7) (51,773) (50,415) Less: Deferred Financing Fees (13,172) (3,466) Total Long-term debt, net $ 2,813,471 $ 3,357,256 (1) During the year ended September 29, 2023, the aggregate principal amounts denominated in U.S. dollars under the Revolving Credit Facility, the 2021 Term loan facility and the 2020 Term Loan Facility (each as defined below) transitioned from underlying LIBOR benchmarked rates to the Term Secured Overnight Financing Rate ("SOFR"). During fiscal 2022, the aggregate principal amounts denominated in British pounds under the Revolving Credit Facility, 2021 Term Loan Facility and 2020 Term Loan Facility transitioned from underlying LIBOR benchmarked rates to Sterling Overnight Index Average ("SONIA") rates. (2) Depending on the Company’s Consolidated Leverage Ratio or Debt Rating (each as defined in the credit agreement governing the Revolving Credit Facility (defined below)), U.S. dollar denominated borrowings under the Revolving Credit Facility bear interest at either a SOFR rate plus a margin of between 0.975% and 1.725% or a base rate plus a margin of between 0% and 0.625%.The applicable SOFR rates or LIBOR rate for the prior fiscal year end, including applicable margins, at September 29, 2023 and September 30, 2022 were approximately 8.75% and 4.08%. Borrowings denominated in British pounds bear interest at an adjusted SONIA rate plus a margin of between 0.908% and 1.6580%. There were no amounts drawn in British pounds as of September 29, 2023. (3) Depending on the Company’s Consolidated Leverage Ratio or Debt Rating (each as defined in the credit agreement governing the 2021 Term Loan Facility (defined below)), U.S. dollar denominated borrowings under the 2021 Term Loan Facility bear interest at either a SOFR rate plus a margin of between 0.975% and 1.725% or a base rate plus a margin of between0% and 0.625%. The applicable SOFR or LIBOR rate for the prior fiscal year end, including applicable margins for borrowings denominated in US Dollars at September 29, 2023 and September 30, 2022, was approximately 6.68% and 4.06%. Borrowings denominated in British pounds bear interest at an adjusted SONIA rate plus a margin of between 0.908% and 1.6580%, which was approximately 6.47% and 3.60% at September 29, 2023 and September 30, 2022, respectively. (4) Depending on the Company’s Consolidated Leverage Ratio or Debt Rating (each as defined in the credit agreement governing the 2020 Term Loan Facility), U.S. dollar denominated borrowings under the 2020 Term Loan Facility bear interest at either a SOFR rate plus a margin of between 0.975% and 1.725% or a base rate plus a margin of between 0% and 0.625%. The applicable SOFR or LIBOR rate for the prior fiscal year end, including applicable margins for borrowings denominated in US Dollars at September 29, 2023 and September 30, 2022 were approximately 6.68% and 4.49%. Borrowings denominated in British pounds bear interest at an adjusted SONIA rate plus a margin between 0.908% and 1.6580%, which was approximately 6.47% and 3.60% at September 29, 2023 and September 30, 2022, respectively. (5) From and including September 1, 2028 (the “First Step Up Date”), the interest rate payable on the 5.90% Bonds (as defined below) will be increased by an additional 12.5 basis points to 6.025% per annum (the “First Step Up Interest Rate”) unless the Company notifies the Trustee (as defined below) on or before the date that is 15 days prior to the First Step Up Date that the Percentage of Gender Diversity Performance Target (as defined in the First Supplemental Indenture (as defined below)) has been satisfied and receives a related assurance letter verifying such compliance. From and including September 1, 2030 (the “Second Step Up Date”), the interest rate payable on the 5.90% Bonds will be increased by 12.5 basis points to (x) 6.150% per annum if the First Step Up Interest Rate was in effect immediately prior to the Second Step Up Date or (y) 6.025% per annum if the initial interest rate was in effect immediately prior to the Second Step Up Date, unless the Company notifies the Trustee on or before the date that is 15 days prior to the Second Step Up Date that the GHG Emissions Performance Target (as defined in the First Supplemental Indenture) has been satisfied and receives a related assurance letter verifying such compliance. (6) All amounts due under the Note Purchase Agreement pursuant to which the Senior Notes (each as defined below) were issued were repaid in the first fiscal quarter of 2023. (7) The current portion of long-term debt is comprised of the 2020 Term Loan quarterly principal repayments of 1.25%, or $9.125 million and £3.125 million, of the aggregate initial principal amount borrowed.
Schedule of Interest Expense	The following table presents the amount of interest paid by the Company during September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 $207,604 $88,031 $54,860

Leases (Tables)

Leases (Tables)	12 Months Ended
	Sep. 29, 2023
Leases [Abstract]
Schedule of Lease Cost	The components of lease expense (reflected in selling, general and administrative expenses) for th e years ended September 29, 2023, September 30, 2022 and October 1, 2021 were as follows (in thousands): September 29, 2023 September 30, 2022 October 1, 2021 Lease cost Operating lease cost $ 141,116 $ 151,134 $ 160,026 Variable lease cost 37,375 36,631 31,727 Sublease income (17,972) (15,207) (12,359) Total lease cost $ 160,519 $ 172,558 $ 179,394 Supplemental information related to the Company's leases for the years ended September 29, 2023 and September 30, 2022 was as follows (in thousands): September 29, 2023 September 30, 2022 Cash paid for amounts included in the measurements of lease liabilities $ 182,831 $ 229,275 Right-of-use assets obtained in exchange for new operating lease liabilities $ 76,210 $ 38,110 Weighted average remaining lease term - operating leases 5.9 years 6.3 years Weighted average discount rate - operating leases 3.2% 2.8%
Schedule of Operating Lease Maturity	Total remaining lease payments under the Company's leases for each of the succeeding years is as follows (in thousands): Fiscal Year Operating Leases 2024 $ 172,405 2025 142,232 2026 118,411 2027 97,226 2028 80,278 Thereafter 156,537 767,089 Less Interest (71,782) $ 695,307

Employee Stock Purchase and S_2

Employee Stock Purchase and Stock Incentive Plans (Tables)	12 Months Ended
	Sep. 29, 2023
Share-Based Payment Arrangement [Abstract]
Schedule of Employee Stock Ownership Plan (ESOP) Disclosures	The following table summarizes the stock issuance activity under the plans for the fiscal years ended September 29, 2023, September 30, 2022 and October 1, 2021: For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 Aggregate Purchase Price Paid for Shares Sold (in thousands): $ 40,195 $ 38,648 $ 32,149 Aggregate Number of Shares Sold: 355,007 302,429 287,587
Schedule of Stock Incentive Plans Plans And Weighted Average Grant-Date Fair Value Of Restricted Stock And Restricted Stock Units	The following table sets forth certain information about the Stock Incentive Plans: 2023 SIP 1999 ODSP Total Number of shares authorized 29,850,000 1,100,000 30,950,000 Number of remaining shares reserved for issuance at September 29, 2023 3,151,532 204,281 3,355,813 Number of shares relating to outstanding stock options at September 29, 2023 61,125 57,225 118,350 Number of shares available for future awards: At September 29, 2023 3,090,407 147,056 3,237,463 At September 30, 2022 3,886,740 161,087 4,047,827 The following table presents the number and weighted average grant-date fair value of restricted stock and restricted stock units at September 29, 2023: Number of Shares Weighted Average Grant-Date Fair Value Outstanding at September 30, 2022 1,375,429 $ 110.64 Granted 1,192,105 $ 122.41 Vested (543,827) $ 102.14 Canceled (133,559) $ 121.89 Outstanding at September 29, 2023 1,890,148 $ 119.71
Schedule of Share-based Compensation, Stock Options, Activity	The following table summarizes the stock option activity for the years ended September 29, 2023, September 30, 2022 and October 1, 2021: Number of Stock Options Weighted Average Outstanding at October 2, 2020 706,489 $ 45.91 Exercised (130,030) $ 47.07 Cancelled or expired (2,475) $ 45.18 Outstanding at October 1, 2021 573,984 $ 45.65 Granted (1) 150,951 $ 12.79 Exercised (284,502) $ 43.56 Cancelled or expired (1,084) $ 21.34 Outstanding at September 30, 2022 439,349 $ 35.77 Exercised (215,649) $ 40.61 Cancelled or expired (6,219) $ 19.73 Outstanding at September 29, 2023 217,481 $ 31.43 (1) Included in the fiscal 2022 amounts granted are options issued related to a recent business combination with strike prices lower than the then-current share price in order to derive a certain value.
Schedule Of Intrinsic Value Of Options	The following table presents the total intrinsic value of stock options exercised for the fiscal years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 $17,635 $28,149 $9,693
Schedule of 2023 SIP, 1999 OSDP and StreetLight Plan	The following table presents certain other information regarding our 2023 SIP, 1999 OSDP and StreetLight Plan for the fiscal years ended September 29, 2023, September 30, 2022 and October 1, 2021: September 29, 2023 September 30, 2022 October 1, 2021 At fiscal year end: Range of exercise prices for options exercisable (1) $5.64–$60.43 $5.64–$60.43 $37.03–$60.43 Number of options exercisable 180,911 367,624 573,984 For the fiscal year: Range of prices relating to options exercised $7.05–$60.43 $11.27-$60.43 $32.51-$60.43 (1) Included in the fiscal 2022 amounts granted are options issued related to a recent business combination with strike prices lower than the then-current share price in order to derive a certain value.
Schedule Of Information Regarding Outstanding Options	The following table presents certain information regarding stock options outstanding at September 29, 2023: September 29, 2023 Options Outstanding Range of Exercise Prices Number Weighted Average Remaining Contractual Life (years) Weighted Average Price $0.00 - $37.03 99,131 6.49 $ 12.57 $37.03 - $46.09 71,750 1.88 $ 41.80 $46.09 - $55.13 31,375 0.65 $ 53.19 $55.13 - $80.63 15,225 0.42 $ 60.43 217,481 3.70 $ 31.43
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity	The following table presents the number of shares of restricted stock and restricted stock units issued as common stock under the 2023 SIP and the StreetLight Plan for the years ended September 29, 2023, September 30, 2022 and October 1, 2021: For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 Restricted stock — 818 — Restricted stock units (service condition) 996,345 290,582 380,722 Restricted stock units (service and performance conditions) 126,595 176,470 181,132 The following table presents the number of shares of restricted stock and restricted stock units canceled and withheld for taxes under the 2023 SIP for the years ended September 29, 2023, September 30, 2022 and October 1, 2021: For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 Restricted stock — — — Restricted stock units (service condition) 94,249 57,366 201,967 Restricted stock units (service and performance conditions) 39,295 31,966 218,520 The following table provides the number of restricted stock units outstanding at September 29, 2023 under the 2023 SIP. September 29, 2023 Restricted stock — Restricted stock units (service condition) 1,341,150 Restricted stock units (service and performance conditions) 488,588 The following table presents the number of shares of restricted stock and restricted stock units issued under the 1999 ODSP for the years ended September 29, 2023, September 30, 2022 and October 1, 2021: For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 Restricted stock units (service condition) 14,031 13,785 17,680 The following table provides the number of shares of restricted stock and restricted stock units outstanding at September 29, 2023 under the 1999 ODSP: September 29, 2023 Restricted stock — Restricted stock units (service condition) 60,359
Schedule of fair value of shares of the 2023 SIP and StreetLight Plan	The following table presents the fair value of shares of the 2023 SIP and the StreetLight Plan (of restricted stock and restricted stock units) vested for the years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 Restricted Stock and Restricted Stock Units (service condition) $ 32,255 $ 23,077 $ 20,374 Restricted Stock Units (service, market, and performance conditions at target) 22,060 22,678 26,495 Total $ 54,315 $ 45,755 $ 46,869

Savings and Deferred Compensa_2

Savings and Deferred Compensation Plans Savings and Deferred Compensation Plans (Tables)	12 Months Ended
	Sep. 29, 2023
Savings And Deferred Compensation Plans [Abstract]
Schedule of Savings Plans Contributions	The following table presents the Company’s contributions to these savings plans for the years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): September 29, 2023 September 30, 2022 October 1, 2021 $ 203,438 $ 184,399 $ 132,865
Schedule of Deferred Compensation Plans Expense	The following table presents the amount charged to expense for the Company’s deferred compensation plans for the years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): September 29, 2023 September 30, 2022 October 1, 2021 $ 4,679 $ 1,697 $ 2,900 The following table presents the amount relating to assets held as deferred compensation arrangement investments for the years ended September 29, 2023 and September 30, 2022 (in thousands): September 29, 2023 September 30, 2022 Deferred compensation arrangement investments $ 168,615 $ 165,118

Pension and Other Postretirem_2

Pension and Other Postretirement Benefit Plans (Tables)	12 Months Ended
	Sep. 29, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Schedule of Change In Plans' Combined Net Benefit Obligations	The following table sets forth the changes in the plans’ combined net benefit obligation (segregated between plans existing within and outside the U.S.) for the years ended September 29, 2023 and September 30, 2022 (in thousands): U.S. Plans Non-U.S. Plans September 29, 2023 September 30, 2022 September 29, 2023 September 30, 2022 Net benefit obligation at the beginning of the year $ 299,503 $ 404,820 $ 1,365,466 $ 2,375,640 Service cost 140 236 6,926 6,480 Interest cost 15,629 10,350 74,077 42,328 Participants’ contributions — — 143 249 Actuarial gains (1) (6,533) (85,067) (176,207) (651,798) Benefits paid (26,887) (25,565) (76,739) (74,378) Curtailments/settlements/plan amendments — (5,271) (1,313) (2,641) Effect of exchange rate changes and other, net — — 107,908 (330,414) Net benefit obligation at the end of the year $ 281,852 $ 299,503 $ 1,300,261 $ 1,365,466 (1) Actuarial gains primarily driven by change in discount rates.
Schedule of Change in Combined Fair Value of the Plans' Assets	The following table sets forth the changes in the combined Fair Value of the plans’ assets (segregated between plans existing within and outside the U.S.) for the years ended September 29, 2023 and September 30, 2022 (in thousands): U.S. Plans Non-U.S. Plans September 29, 2023 September 30, 2022 September 29, 2023 September 30, 2022 Fair value of plan assets at the beginning of the year $ 286,193 $ 385,521 $ 1,297,625 $ 2,203,495 Actual returns (losses) on plan assets 18,310 (68,585) (103,324) (557,972) Employer contributions 85 93 28,991 33,032 Participants’ contributions — — 143 249 Gross benefits paid (27,005) (25,565) (77,070) (74,378) Curtailments/settlements/plan amendments — (5,271) (1,313) (2,641) Effect of exchange rate changes and other, net — — 97,973 (304,160) Fair value of plan assets at the end of the year $ 277,583 $ 286,193 $ 1,243,025 $ 1,297,625
Schedule of Reconciliation of Combined Funded Status of Plans and Recognized in Consolidated Balance Sheet	The following table reconciles the combined funded statuses of the plans recognized in the accompanying Consolidated Balance Sheets at September 29, 2023 and September 30, 2022 (segregated between plans existing within and outside the U.S.) (in thousands): U.S. Plans Non-U.S. Plans September 29, 2023 September 30, 2022 September 29, 2023 September 30, 2022 Net benefit obligation at the end of the year $ 281,852 $ 299,503 $ 1,300,261 $ 1,365,466 Fair value of plan assets at the end of the year 277,583 286,193 1,243,025 1,297,625 Underfunded amount recognized at the end of the year $ 4,269 $ 13,310 $ 57,236 $ 67,841
Schedule of Accumulated and Projected Benefit Obligations	The following table presents the accumulated benefit obligation at September 29, 2023 and September 30, 2022 (segregated between plans existing within and outside the U.S.) (in thousands): U.S. Plans Non-U.S. Plans September 29, 2023 September 30, 2022 September 29, 2023 September 30, 2022 Accumulated benefit obligation at the end of the year $ 280,956 $ 299,347 $ 1,285,980 $ 1,355,717
Schedule of Amount Recognized in Accompanying Balance Sheets	The following table presents the amounts recognized in the accompanying Consolidated Balance Sheets at September 29, 2023 and September 30, 2022 (segregated between plans existing within and outside the U.S.) (in thousands): U.S. Plans Non-U.S. Plans September 29, 2023 September 30, 2022 September 29, 2023 September 30, 2022 Prepaid benefit cost included in noncurrent assets $ 758 $ — $ 57,678 $ 54,897 Accrued benefit cost included in current liabilities 80 83 5,182 4,359 Accrued benefit cost included in noncurrent liabilities 4,947 13,227 109,732 118,379 Net amount recognized at the end of the year $ 4,269 $ 13,310 $ 57,236 $ 67,841
Schedule of Pension Plans Recorded In Accumulated Other Comprehensive Loss Not Yet Recognized As Component of Net Periodic Pension Cost	The following table presents certain amounts relating to our plans recorded in accumulated other comprehensive loss that have not yet been recognized as components of net periodic benefit cost at September 29, 2023 and September 30, 2022 (segregated between U.S. and non-U.S. plans) (in thousands): U.S. Plans Non-U.S. Plans September 29, 2023 September 30, 2022 September 29, 2023 September 30, 2022 Net actuarial losses $ 34,940 $ 37,638 $ 269,671 $ 248,716 Prior service cost 373 697 20,708 20,344 Total $ 35,313 $ 38,335 $ 290,379 $ 269,060
Schedule of Accumulated Comprehensive Income Amortized Against Earnings In Next Year	The following table presents the amount of accumulated comprehensive income that will be amortized against earnings as part of our net periodic benefit cost in fiscal 2024 based on 2023 exchange rates (segregated between U.S. and non-U.S. plans) (in thousands): U.S. Plans Non-U.S. Plans Unrecognized net actuarial (gains) losses $ (1,384) $ 7,261 Unrecognized prior service cost 431 1,488 Accumulated comprehensive (gains) losses to be recorded against earnings $ (953) $ 8,749
Schedule of Weighted Average Measurement Of Assets And Liabilities	The plans’ weighted average asset allocations at September 29, 2023 and September 30, 2022 (the measurement dates used in valuing the plans’ assets and liabilities) were as follows: U.S. Plans Non-U.S. Plans September 29, 2023 September 30, 2022 September 29, 2023 September 30, 2022 Equity securities 3 % 2 % 16 % 15 % Debt securities 65 % 66 % 50 % 49 % Real estate investments — % — % 10 % 11 % Other 32 % 32 % 24 % 25 %
Schedule of Anticipated Cash Contributions	The following table presents the amount of cash contributions we anticipate making into the plans during fiscal 2024 (in thousands): U.S. Plans Non-U.S. Plans Anticipated cash contributions $ — $ 19,281
Schedule of Expected Payments to Participants in Pension Plan	The following table presents the total benefit payments expected to be paid to plan participants during each of the next five fiscal years, and in total for the five years thereafter (in thousands): U.S. Plans Non-U.S. Plans 2024 $ 29,761 $ 77,160 2025 28,452 79,545 2026 27,682 80,028 2027 26,269 86,229 2028 25,568 85,878 For the periods 2029 through 2033 111,361 441,520
Schedule of Contribution to Multiemployer Pension Plans	The following table presents the Company’s contributions to these multiemployer plans for the years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): September 29, 2023 September 30, 2022 October 1, 2021 Europe $ 1,530 $ 1,548 $ 1,713 United States 4,392 11,038 11,316 Contributions to multiemployer pension plans $ 5,922 $ 12,586 $ 13,029
U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Schedule of Significant Actuarial Assumptions In Determining Funded Status Plans	The following table presents the significant actuarial assumptions used in determining the funded statuses and the following year's benefit cost of the Company’s U.S. plans for the years ended September 29, 2023, September 30, 2022 and October 1, 2021: For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 Discount rates 5.8% to 5.9% 4.2% to 5.5% 2.3% to 2.8% Rates of compensation increases 3.5% 3.5% 3.5% Expected long-term rates of return on assets 4.8% to 7.0% 5.5% to 6.4% 4.7% to 5.1%
Schedule of Pension Plans Recognized In Accumulated Other Comprehensive Loss	The following table presents certain amounts relating to our U.S. plans recognized in accumulated other comprehensive (gain) loss at September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): September 29, 2023 September 30, 2022 October 1, 2021 Arising during the period: Net actuarial (gains) losses $ (4,032) $ 578 $ (25,109) Prior service cost — — — Total (4,032) 578 (25,109) Reclassification adjustments: Net actuarial gains (losses) 1,335 (2,157) (3,204) Prior service benefit (324) (324) (325) Total 1,011 (2,481) (3,529) Total $ (3,021) $ (1,903) $ (28,638)
Schedule of Fair Value of Pension Plan Assets	The following table presents the fair value of the Company’s Domestic U.S. plan assets at September 29, 2023, segregated by level of fair value measurement inputs within the Fair Value hierarchy promulgated by U.S. GAAP (in thousands): September 29, 2023 Fair Value, Determined Using Fair Value Measurement Inputs Level 1 Level 2 Level 3 Investments measured at Net Asset Value Total Equities $ 8,172 $ — $ — $ — $ 8,172 Domestic bonds 3,803 151,969 — — 155,772 Overseas bonds — 23,734 — — 23,734 Cash and equivalents 17,841 — — — 17,841 Mutual funds 72,064 — — — 72,064 Total $ 101,880 $ 175,703 $ — $ — $ 277,583 The following table presents the fair value of the Company’s U.S. plan assets at September 30, 2022, segregated by level of fair value measurement inputs within the Fair Value hierarchy promulgated by U.S. GAAP (in thousands): September 30, 2022 Fair Value, Determined Using Fair Value Measurement Inputs Level 1 Level 2 Level 3 Investments measured at Net Asset Value Total Equities $ 6,708 $ — $ — $ — $ 6,708 Domestic bonds 64,396 106,961 — — 171,357 Overseas bonds — 15,200 — — 15,200 Cash and equivalents 19,025 — — — 19,025 Mutual funds 73,903 — — — 73,903 Total $ 164,032 $ 122,161 $ — $ — $ 286,193
Schedule of Net Benefit Costs	The following table presents the components of net periodic benefit cost for the Company’s U.S. plans recognized in the accompanying Consolidated Statements of Earnings for the years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): September 29, 2023 September 30, 2022 October 1, 2021 Service cost $ 140 $ 236 $ 456 Interest cost 15,629 10,350 10,221 Expected return on plan assets (19,496) (16,933) (15,932) Actuarial (gains) losses (1,770) 2,861 4,249 Prior service cost 430 430 431 Net pension income, before special items $ (5,067) $ (3,056) $ (575) Curtailment expense/Settlement (gains) losses — (206) (64) Total net periodic pension income recognized $ (5,067) $ (3,262) $ (639)
Non-U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Schedule of Significant Actuarial Assumptions In Determining Funded Status Plans	The following table presents the significant actuarial assumptions used in determining the funded statuses and the following year's benefit cost of the Company’s non-U.S. plans for the years ended September 29, 2023, September 30, 2022 and October 1, 2021: For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 Discount rates 3.8% to 6.9% 2.4% to 7.4% 0.6% to 6.6% Rates of compensation increases 2.8% to 9.0% 2.5% to 9.0% 2.4% to 7.5% Expected long-term rates of return on assets 5.3% to 7.6% 3.3% to 7.5% 2.0% to 7.0%
Schedule of Pension Plans Recognized In Accumulated Other Comprehensive Loss	The following table presents certain amounts relating to our non-U.S. plans recognized in accumulated other comprehensive (gain) loss at September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): September 29, 2023 September 30, 2022 October 1, 2021 Arising during the period: Net actuarial losses (gains) $ 27,188 $ (78,705) $ (65,547) Prior service cost — — — Total 27,188 (78,705) (65,547) Reclassification adjustments: Net actuarial losses (4,802) (5,492) (8,761) Prior service benefit (1,068) (1,066) (1,219) Total (5,870) (6,558) (9,980) Total $ 21,318 $ (85,263) $ (75,527)
Schedule of Fair Value of Pension Plan Assets	The following table presents the fair value of the Company’s non-U.S. plan assets at September 29, 2023, segregated by level of fair value measurement inputs within the Fair Value hierarchy promulgated by U.S. GAAP (in thousands): September 29, 2023 Fair Value, Determined Using Fair Value Measurement Inputs Level 1 Level 2 Level 3 Investments measured at Net Asset Value Total Domestic equities $ — $ 50,243 $ — $ 761 $ 51,004 Overseas equities — 74,377 — 80,123 154,500 Domestic bonds — 30,505 — — 30,505 Overseas bonds — 520,322 — 65,243 585,565 Cash and equivalents 21,568 434 — — 22,002 Real estate — 4,145 84,755 35,199 124,099 Insurance contracts — — 87,160 — 87,160 Hedge funds — — 78,617 19,130 97,747 Mutual funds — 90,443 — — 90,443 Total $ 21,568 $ 770,469 $ 250,532 $ 200,456 $ 1,243,025 The following table presents the fair value of the Company’s non-U.S. plan assets at September 30, 2022, segregated by level of fair value measurement inputs within the Fair Value hierarchy promulgated by U.S. GAAP (in thousands): September 30, 2022 Fair Value, Determined Using Fair Value Measurement Inputs Level 1 Level 2 Level 3 Investments measured at Net Asset Value Total Domestic equities $ — $ 42,655 $ — $ 1,539 $ 44,194 Overseas equities — 74,056 — 76,813 150,869 Domestic bonds — 38,448 — — 38,448 Overseas bonds — 532,697 — 64,897 597,594 Cash and equivalents 9,667 1,835 — — 11,502 Real estate — 4,076 102,868 36,959 143,903 Insurance contracts — — 80,231 80,231 Hedge funds — — 138,603 11,568 150,171 Mutual funds — 80,713 — — 80,713 Total $ 9,667 $ 774,480 $ 321,702 $ 191,776 $ 1,297,625
Schedule of Changes in the Fair Value of Plans Level 3 Assets	The following table summarizes the changes in the fair value of the Company’s non-U.S. Pension Plans’ Level 3 assets for the years ended September 29, 2023 and September 30, 2022 (in thousands): Real Estate Insurance Contracts Hedge Funds Balance at Balance at October 1, 2021 $ 116,936 $ 133,802 $ 231,319 Net purchases, sales, and settlements (8,686) (6,312) (11,553) Realized and unrealized gains (losses) 14,701 (24,770) (42,964) Effect of exchange rate changes (20,083) (22,489) (38,199) Balance at September 30, 2022 $ 102,868 $ 80,231 $ 138,603 Net purchases, sales, and settlements (35,119) 8,587 (56,624) Realized and unrealized gains (losses) 12,842 (13,555) (11,532) Effect of exchange rate changes 4,164 11,897 8,170 Balance at September 29, 2023 $ 84,755 $ 87,160 $ 78,617
Schedule of Net Benefit Costs	The following table presents the components of net periodic benefit cost for the Company’s Non-U.S. plans recognized in the accompanying Consolidated Statements of Earnings for the years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): September 29, 2023 September 30, 2022 October 1, 2021 Service cost $ 6,926 $ 6,480 $ 6,568 Interest cost 74,077 42,328 38,907 Expected return on plan assets (73,387) (71,875) (90,346) Actuarial losses 6,317 7,147 10,834 Prior service cost 1,424 1,421 1,519 Net pension cost (income), before special items $ 15,357 $ (14,499) $ (32,518) Curtailment expense/Settlement losses 208 329 2,847 Total net periodic pension cost (income) recognized $ 15,565 $ (14,170) $ (29,671)

PA Consulting Business Combin_2

PA Consulting Business Combinations (Tables)	12 Months Ended
	Sep. 29, 2023
Business Acquisition [Line Items]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The following summarizes the fair values of StreetLight's assets acquired and liabilities assumed as of the acquisition date (in millions): Assets Cash and cash equivalents $ 7.3 Receivables 5.2 Property, equipment and improvements, net 0.1 Goodwill 116.4 Identifiable intangible assets 105.1 Prepaid expenses and other current assets 2.0 Total Assets $ 236.1 Liabilities Accounts payable, accrued expenses and other current liabilities $ 23.1 Other long-term liabilities 16.1 Total Liabilities 39.2 Net assets acquired $ 196.9 Assets Cash and cash equivalents $ 5.1 Receivables 7.7 Property, equipment and improvements, net 0.8 Goodwill 195.8 Identifiable intangible assets 51.1 Prepaid expenses and other current assets 3.2 Total Assets $ 263.7 Liabilities Accounts payable, accrued expenses and other current liabilities $ 19.5 Other long-term liabilities 8.8 Total Liabilities 28.3 Net assets acquired $ 235.4
PA Consulting Group Limited
Business Acquisition [Line Items]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The following summarizes the fair values of PA Consulting's assets acquired and liabilities assumed as of the acquisition date (in millions): Assets Cash and cash equivalents $ 134.9 Receivables 166.5 Property, equipment and improvements, net 40.5 Goodwill 1,454.0 Identifiable intangible assets 1,004.2 Prepaid expenses and other current assets 9.5 Miscellaneous long-term assets 84.0 Total Assets $ 2,893.6 Liabilities Accounts payable $ 6.5 Accrued liabilities and other current liabilities 354.8 Other long-term liabilities 248.0 Total Liabilities 609.3 Redeemable Noncontrolling interests 582.4 Net assets acquired $ 1,701.9
Schedule of Unaudited Proforma Operating Results	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, except per share data): For the Year Ended October 1, 2021 Revenues $ 14,504.3 Net earnings of the Group $ 695.1 Net earnings attributable to Jacobs $ 548.0 Net earnings attributable to Jacobs per share: Basic earnings per share $ 4.21 Diluted earnings per share $ 4.17
Schedule of Redeemable Noncontrolling Interest	Changes in the Company's redeemable noncontrolling interests d uring the fiscal years ended September 29, 2023 and September 30, 2022 are as follows (in thousands): September 29, 2023 September 30, 2022 Redeemable noncontrolling interest at the beginning of the year $ 632,522 $ 657,722 Accrued Preferred Dividend to Preference Shareholders 72,891 67,598 Attribution of Preferred Dividend to Common Shareholders (72,891) (67,598) Net earnings attributable to redeemable noncontrolling interest to Common Shareholders 21,614 34,585 Redeemable Noncontrolling interests redemption value adjustment 10,770 27,657 Repurchase of redeemable noncontrolling interests (111,005) (53,834) Issuance of redeemable noncontrolling interests 37,789 54,884 Cumulative translation adjustment and other 41,289 (88,492) Redeemable noncontrolling interest at the end of the year $ 632,979 $ 632,522

Other Business Combinations (Ta

Other Business Combinations (Tables)	12 Months Ended
	Sep. 29, 2023
Business Acquisition [Line Items]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The following summarizes the fair values of StreetLight's assets acquired and liabilities assumed as of the acquisition date (in millions): Assets Cash and cash equivalents $ 7.3 Receivables 5.2 Property, equipment and improvements, net 0.1 Goodwill 116.4 Identifiable intangible assets 105.1 Prepaid expenses and other current assets 2.0 Total Assets $ 236.1 Liabilities Accounts payable, accrued expenses and other current liabilities $ 23.1 Other long-term liabilities 16.1 Total Liabilities 39.2 Net assets acquired $ 196.9 Assets Cash and cash equivalents $ 5.1 Receivables 7.7 Property, equipment and improvements, net 0.8 Goodwill 195.8 Identifiable intangible assets 51.1 Prepaid expenses and other current assets 3.2 Total Assets $ 263.7 Liabilities Accounts payable, accrued expenses and other current liabilities $ 19.5 Other long-term liabilities 8.8 Total Liabilities 28.3 Net assets acquired $ 235.4
Buffalo Group
Business Acquisition [Line Items]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The following summarizes the fair values of The Buffalo Group's assets acquired and liabilities assumed as of the acquisition date (in millions): Assets Cash and cash equivalents $ 8.4 Receivables 19.2 Property, equipment and improvements, net 2.3 Goodwill 130.7 Identifiable intangible assets 74.0 Prepaid expenses and other current assets 6.2 Total Assets $ 240.8 Liabilities Accounts payable, accrued expenses and other current liabilities $ 46.9 Other long-term liabilities 3.8 Total Liabilities 50.7 Net assets acquired $ 190.1

Restructuring and Other Charg_2

Restructuring and Other Charges (Tables)	12 Months Ended
	Sep. 29, 2023
Restructuring and Related Activities [Abstract]
Schedule 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 by operating segment in connection with the CH2M, John Wood Group's nuclear business, BlackLynx and StreetLight acquisitions, the PA Consulting investment, the ECR sale, the CMS separation, the DVS segment reorganization and the Company's transformation initiatives relating to real estate and other staffing programs and the impairment and final exit activities of the AWE ML investment for the years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): September 29, 2023 September 30, 2022 October 1, 2021 Critical Mission Solutions $ 3,143 $ 5,626 $ 5,079 People & Places Solutions 55,749 64,204 7,077 Divergent Solutions 8,307 — — PA Consulting 14,706 4,253 15,566 Corporate 51,130 86,980 71,868 Total 133,035 161,063 99,590 Amounts included in: Operating profit (mainly Selling, General and Administrative costs (“SG&A") (1) 136,411 173,555 61,042 Other (Income) Expense, net (2) (3,376) (12,492) 38,548 $ 133,035 $ 161,063 $ 99,590 (1) The year ended September 29, 2023 includes $63.4 million of restructuring and other charges across all segments relating to the CMS separation (mainly professional services and employee separation costs) and $14.3 million in restructuring and other charges relating to the Company's investment in PA Consulting (primarily employee separation costs). For the year ended September 30, 2022, amounts included $91.3 million pre-tax related to the final settlement of the Legacy CH2M Matter (as defined in Note 18 - Contractual Guarantees, Litigation, Investigations and Insurance ), net of previously recorded reserves and approximately $27 million in third party recoveries was recorded as receivables reducing SG&A. Included in the years ended September 29, 2023, September 30, 2022 and October 1, 2021 were $50.7 million, $78.3 million and $2.4 million in charges associated mainly with real estate impairments, the majority of which related to People and Places Solutions. (2) The years ended September 29, 2023 and September 30, 2022 included gains of $3.4 million and $8.7 million, respectively, related to lease terminations. The year ended October 1, 2021 included $38.5 million in charges related to the impairment of our AWE ML investment.
Schedule of Derivative, Gain (loss) on Derivative, Net	The activity in the Company’s accrual for the Restructuring and other charges including the program activities described above for the year ended September 29, 2023 is as follows (in thousands): Balance at September 30, 2022 $ 4,137 Net Charges (1) 85,728 Payments & Usage (52,547) Balance at September 29, 2023 $ 37,318 (1) Exclude s $47.3 million in other net charges associated mainly with real estate related impairments and other transformation activities described above during the year ended September 29, 2023 .
Schedule of Restructuring and Other Activities by Major Type of Costs	The following table summarizes the Restructuring and other charges by major type of costs for the years ended September 29, 2023, September 30, 2022 and October 1, 2021 (in thousands): September 29, 2023 September 30, 2022 October 1, 2021 Lease Abandonments and Impairments $ 46,195 $ 69,802 $ 4,282 Voluntary and Involuntary Terminations 41,435 5,635 15,773 Outside Services 36,030 22,340 35,210 Other (1) 9,375 63,286 44,325 Total $ 133,035 $ 161,063 $ 99,590 (1) Amounts in the year ended September 29, 2023 are mainly comprised of charges associated with the write off of fixed assets associated with programs that the Company will no longer continue to pursue in connection with the CMS separation. Amounts in the year ended September 30, 2022 are mainly comprised of $91.3 million in other charges related to the final pre-tax settlement of the Legacy CH2M Matter, net of previously recorded reserves and approximately $27 million in third party recoveries was recorded as receivables reducing SG&A. Amounts in the year ended October 1, 2021 are mainly comprised of $38.5 million in charges
Schedule of Cumulative Amounts Incurred for Restructuring and Other Activities Costs	Cumulative amounts incurred to date under our various restructuring and other activities described above and with charges in the periods presented by each major type of cost as of September 29, 2023 are as follows (in thousands): Lease Abandonments and Impairments $ 432,724 Voluntary and Involuntary Terminations 182,191 Outside Services 347,950 Other 202,313 Total $ 1,165,178

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Sep. 29, 2023
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 from continuing operations 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, Restructuring and other charges (as defined in Note 16 -Restructuring and Other Charges ) and transaction and integration costs (in thousands). For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 Revenues from External Customers: Critical Mission Solutions $ 4,693,499 $ 4,376,562 $ 4,251,690 People & Places Solutions 9,553,857 8,534,650 8,364,640 Divergent Solutions 946,914 892,317 848,901 PA Consulting 1,158,144 1,119,296 627,401 Total $ 16,352,414 $ 14,922,825 $ 14,092,632 For the Years Ended September 29, 2023 September 30, 2022 October 1, 2021 Segment Operating Profit: Critical Mission Solutions $ 378,201 $ 355,563 $ 359,001 People & Places Solutions (1) 957,714 824,834 780,514 Divergent Solutions 81,768 67,552 88,026 PA Consulting 237,003 232,225 151,071 Total Segment Operating Profit 1,654,686 1,480,174 1,378,612 Other Corporate Expenses (2) (427,053) (364,440) (340,129) Restructuring, Transaction and Other Charges (3) (152,396) (197,884) (350,394) Total U.S. GAAP Operating Profit 1,075,237 917,850 688,089 Total Other (Expense) Income, net (4) (158,558) (41,503) 7,513 Earnings from Continuing Operations Before Taxes $ 916,679 $ 876,347 $ 695,602 (1) Includes $19.5 million, net, in charges related to a legal settlement for the year ended October 1, 2021. (2) Other corporate expenses include intangibles amortization of $203.9 million, $198.6 million and $149.8 million for the years ended September 29, 2023, September 30, 2022 and October 1, 2021, respectively, with the comparative increase from fiscal 2021 to fiscal 2022 mainly attributable to higher amortization from the PA Consulting investment. Additionally, fiscal 2023 included approximately $15.0 million in net favorable impacts from cost reductions compared to the prior year period, which was associated mainly with net favorable impacts during first quarter from changes in employee benefit programs of $41.0 million offset by approximately $26.0 million in higher spend in company technology platforms and other personnel and corporate cost increases. (3) Fiscal 2023 includes $63.4 million relating to the activities (mainly professional services and employee separation costs, spread across all segments) around the CMS separation and $14.3 million in restructuring and other charges relating to the Company's investment in PA Consulting (primarily employee separation costs). Included in the years ended September 29, 2023, September 30, 2022 and October 1, 2021 were $48.2 million, $78.3 million and $2.4 million, respectively, in charges associated mainly with real estate impairments. Included in the year ended September 30, 2022 is $91.3 million pre-tax re lated to the final settlement of the Legacy CH2M Matter and net of previously recorded reserve s and approximately $27 million in third party recoveries that was recorded as receivables reducing SG&A . Included in the year ended October 1, 2021 is $297.8 million of costs incurred in connection with the investment in PA Consulting, in part classified as compensation costs. (4) The year ended September 30, 2022 included a $13.9 million gain related to a cost method investment sold during the period and a gain of $8.7 million related to lease terminations. The year ended October 1, 2021 included $34.7 million in fa ir value adjustments related to our investment in Worley stock (net of Worley stock div idends) and certain foreign currency r evaluations relating to ECR sale proceeds, $(38.5) million related to impairment of our AWE Management Ltd. investment and $49.6 million in fair value adjustments related to our investment in C3 stock. The investments in Worley and C3 were sold in fiscal 2021 and therefore there are no comparable amounts in fiscal 2022 or 2023. Additionally, the increase in net interest expense from fiscal 2021 to fiscal 2022 is primarily due to the higher levels of debt outstanding due to the funding of the StreetLight and BlackLynx acquisitions and increased borrowings associated with the payment of the Legacy CH2M Matter settlement in fiscal 2022, in addition to higher interest rates. The increase in net interest expense from fiscal 2022 to fiscal 2023 is due primarily to higher interest rates.

Description of Business and B_3

Description of Business and Basis of Presentation - Schedule of Revenues Realized from Each of These Types of Contracts (Details)	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cost-reimbursable	74.10%	74%	76%
Fixed-price	25.90%	26%	24%

Description of Business and B_4

Description of Business and Basis of Presentation - Basis of Presentation, Acquisition Narrative (Details) shares in Millions						3 Months Ended	12 Months Ended
	Feb. 04, 2022 USD ($)	Nov. 19, 2021 USD ($)	Mar. 02, 2021 USD ($)	Nov. 24, 2020 USD ($)	Apr. 26, 2019 USD ($) shares	Dec. 30, 2022 operating_segment	Sep. 29, 2023 USD ($) operating_segment	Sep. 30, 2022
Business Acquisition [Line Items]
Number of operating segments | operating_segment						4	4
PA Consulting Employees
Business Acquisition [Line Items]
Ownership interest of employees			35%				69%	65%
Worley Stock
Business Acquisition [Line Items]
Equity instrument consideration, shares | shares					58.2
ECR Business
Business Acquisition [Line Items]
Business combination consideration paid in cash					$ 2,800,000,000
Consideration transferred					$ 3,400,000,000
ECR Business | Discontinued Operations
Business Acquisition [Line Items]
Assets held for sale							$ 0
StreetLightData, Inc.
Business Acquisition [Line Items]
Business combination consideration paid in cash	$ 190,800,000
Business combination consideration equity issued	900,000
Money stock options	5,200,000
Transferred liabilities incurred	$ 1,000,000
BlackLynx
Business Acquisition [Line Items]
Business combination consideration paid in cash		$ 235,400,000
Transferred liabilities incurred		5,300,000
Business combination, recognized identifiable assets acquired and liabilities assumed, noncurrent liabilities, long-term debt		$ 5,300,000
PA Consulting Group Limited
Business Acquisition [Line Items]
Percentage of outstanding shares of common and preferred stock acquired			65%
Consideration transferred			$ 1,700,000,000
Redeemable noncontrolling interests had a fair value			$ 582,400,000
Buffalo Group
Business Acquisition [Line Items]
Business combination consideration paid in cash				$ 182,400,000
Business combination, recognized identifiable assets acquired and liabilities assumed, noncurrent liabilities, long-term debt				7,700,000
Consideration transferred				190,100,000
Contingent consideration				$ 7,700,000

Significant Accounting Polici_3

Significant Accounting Policies - Narrative (Details)	Mar. 02, 2021	Sep. 29, 2023	Sep. 30, 2022
PA Consulting Employees
Significant Accounting Policies [Line Items]
Ownership interest of employees	35%	69%	65%
Preferred stock cumulative dividend rate	12%
Preferred stock redemption period	5 years
Minimum
Significant Accounting Policies [Line Items]
Term of lease contract		1 year
Maximum
Significant Accounting Policies [Line Items]
Term of lease contract		20 years
Buildings | Minimum
Significant Accounting Policies [Line Items]
Estimated useful life of assets		20 years
Buildings | Maximum
Significant Accounting Policies [Line Items]
Estimated useful life of assets		40 years
Equipment | Minimum
Significant Accounting Policies [Line Items]
Estimated useful life of assets		3 years
Equipment | Maximum
Significant Accounting Policies [Line Items]
Estimated useful life of assets		10 years
Leasehold improvements | Minimum
Significant Accounting Policies [Line Items]
Estimated useful life of assets		2 years
Leasehold improvements | Maximum
Significant Accounting Policies [Line Items]
Estimated useful life of assets		20 years

Revenue Accounting for Contra_3

Revenue Accounting for Contracts - Schedule of Disaggregation of Revenue / Schedules of Concentration of Risk (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	$ 16,352,414	$ 14,922,825	$ 14,092,632
U.S. Federal Government and it's Agencies | Revenue Benchmark | Customer Concentration Risk
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Concentration risk, percentage	31%	31%	33%
U.S. Plans
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	$ 10,963,072	$ 9,875,252	$ 9,671,281
Europe
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	3,598,140	3,488,317	3,140,114
Canada
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	268,466	269,386	227,692
Asia
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	135,359	140,663	114,118
India
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	164,212	114,235	70,772
Australia and New Zealand
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	696,870	706,283	647,866
Middle East and Africa
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	$ 526,295	$ 328,689	$ 220,789

Revenue Accounting for Contra_4

Revenue Accounting for Contracts - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Contract liability	$ 504	$ 422
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, amount	$ 18,700
Remaining performance obligation, percentage	53%
Remaining performance obligation, expected timing of satisfaction, period	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, percentage	47%
Remaining performance obligation, expected timing of satisfaction, period

Earnings Per Share and Certai_3

Earnings Per Share and Certain Related Information - Schedule of Compute Basic and Diluted of EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Numerator for Basic and Diluted EPS:
Net earnings attributable to Jacobs from continuing operations	$ 666,619	$ 644,071	$ 467,022
Preferred Redeemable Noncontrolling interests redemption value adjustment (See Note 14- PA Consulting Business Combination)	8,340	0	(57,307)
Net earnings from continuing operations allocated to common stock for EPS calculation	674,959	644,071	409,715
Net (loss) earnings from discontinued operations allocated to common stock for EPS calculation	(842)	(32)	10,008
Net earnings allocated to common stock for EPS calculation	$ 674,117	$ 644,039	$ 419,723
Denominator for Basic and Diluted EPS:
Shares used for calculating basic EPS attributable to common stock (in shares)	126,607	128,665	130,194
Effect of dilutive securities:
Stock compensation plans (in shares)	607	780	1,080
Shares used for calculating diluted EPS attributable to common stock (in shares)	127,214	129,445	131,274
Net Earnings Per Share:
Basic Net Earnings from Continuing Operations Per Share (in dollars per share)	$ 5.33	$ 5.01	$ 3.15
Basic Net (Loss) Earnings from Discontinued Operations Per Share (in dollars per share)	(0.01)	0	0.08
Basic Earnings Per Share (in dollars per share)	5.32	5.01	3.22
Basic Earnings Per Share:
Diluted Net Earnings from Continuing Operations Per Share (in dollars per share)	5.31	4.98	3.12
Diluted Net (Loss) Earnings from Discontinued Operations Per Share (in dollars per share)	(0.01)	0	0.08
Diluted Earnings Per Share (in dollars per share)	$ 5.30	$ 4.98	$ 3.20

Earnings Per Share and Certai_4

Earnings Per Share and Certain Related Information - Narrative (Details)

3 Months Ended

12 Months Ended

Sep. 28, 2023 $ / shares

Jul. 06, 2023 $ / shares

Apr. 27, 2023 $ / shares

Jan. 25, 2023 USD ($) $ / shares

Sep. 15, 2022 $ / shares

Jul. 13, 2022 $ / shares

Apr. 28, 2022 $ / shares

Jan. 26, 2022 $ / shares

Dec. 31, 2021 shares

Sep. 29, 2023 USD ($) class $ / shares shares

Mar. 31, 2023 USD ($)

Sep. 30, 2022 $ / shares

Oct. 01, 2021 USD ($)

Jan. 16, 2020 USD ($)

Class of Stock [Line Items]

Number of classes of stock authorized | class

2

Dividends declared (in dollars per share) | $ / shares

$ 0.26

$ 0.26

$ 0.26

$ 0.26

$ 0.23

$ 0.23

$ 0.23

$ 0.23

Preferred stock, par value (in dollars per share) | $ / shares

$ 1

$ 1

Common stock, par value (in dollars per share) | $ / shares

$ 1

$ 1

2020 Stock Repurchase Program

Class of Stock [Line Items]

Amount authorized to be repurchased

$ 1,000,000,000

$ 1,000,000,000

Shares Repurchased (in shares) | shares

1,237,688

Accelerated Share Repurchase Program

Class of Stock [Line Items]

Amount authorized to be repurchased

$ 250,000,000

Shares Repurchased (in shares) | shares

342,054

2023 Stock Repurchase Program

Class of Stock [Line Items]

Amount authorized to be repurchased

$ 1,000,000,000

$ 1,000,000,000

Remaining authorized repurchase amount

$ 874,800,000

Shares Repurchased (in shares) | shares

1,088,012

Earnings Per Share and Certai_5

Earnings Per Share and Certain Related Information - Schedule of Share Repurchases Activity (Details) - USD ($)	12 Months Ended
	Sep. 29, 2023	Mar. 31, 2023	Jan. 25, 2023	Jan. 16, 2020
2020 Stock Repurchase Program
Class of Stock [Line Items]
Amount authorized to be repurchased		$ 1,000,000,000		$ 1,000,000,000
Average price per share (in dollars per share)	$ 113.56
Shares Repurchased (in shares)	1,237,688
Number of shares repurchased (in shares)	1,237,688
2023 Stock Repurchase Program
Class of Stock [Line Items]
Amount authorized to be repurchased	$ 1,000,000,000		$ 1,000,000,000
Average price per share (in dollars per share)	$ 115.04
Shares Repurchased (in shares)	1,088,012
Number of shares repurchased (in shares)	1,088,012

Earnings Per Share and Certai_6

Earnings Per Share and Certain Related Information - Schedule of Dividends Paid (Details) - $ / shares	Sep. 28, 2023	Aug. 25, 2023	Jul. 06, 2023	Jun. 23, 2023	Apr. 27, 2023	Mar. 24, 2023	Jan. 25, 2023	Oct. 28, 2022	Sep. 15, 2022	Aug. 26, 2022	Jul. 13, 2022	Jun. 24, 2022	Apr. 28, 2022	Mar. 25, 2022	Jan. 26, 2022
Earnings Per Share Reconciliation [Abstract]
Dividends declared (in dollars per share)	$ 0.26		$ 0.26		$ 0.26		$ 0.26		$ 0.23		$ 0.23		$ 0.23		$ 0.23
Dividends paid (in dollars per share)		$ 0.26		$ 0.26		$ 0.26		$ 0.23		$ 0.23		$ 0.23		$ 0.23

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	12 Months Ended
	Sep. 29, 2023 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 7,184,658
Acquired	11,956
Post-Acquisition Adjustments	739
Foreign currency translation and other	146,173
Ending balance	7,343,526
Critical Mission Solutions
Goodwill [Roll Forward]
Beginning balance	2,251,724
Acquired	0
Post-Acquisition Adjustments	0
Foreign currency translation and other	(6,739)
Ending balance	2,244,985
People & Places Solutions
Goodwill [Roll Forward]
Beginning balance	3,196,796
Acquired	0
Post-Acquisition Adjustments	(138)
Foreign currency translation and other	11,535
Ending balance	3,208,193
Divergent Solutions
Goodwill [Roll Forward]
Beginning balance	576,986
Acquired	0
Post-Acquisition Adjustments	0
Foreign currency translation and other	18,726
Ending balance	595,712
PA Consulting
Goodwill [Roll Forward]
Beginning balance	1,159,152
Acquired	11,956
Post-Acquisition Adjustments	877
Foreign currency translation and other	122,651
Ending balance	$ 1,294,636

Goodwill and Intangibles - Sc_2

Goodwill and Intangibles - Schedule of Acquired Intangibles in Accompanying Consolidated Balance Sheets (Details) $ in Thousands	12 Months Ended
	Sep. 29, 2023 USD ($)
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	$ 1,394,052
Amortization	(203,906)
Acquired	5,537
Post Acquisition Adjustments	(1,409)
Foreign currency translation and other	77,669
Ending balance	$ 1,271,943
Weighted Average Amortization Period (years)	8 years
Customer Relationships, Contracts and Backlog
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	$ 1,136,438
Acquired	5,537
Post Acquisition Adjustments	(1,409)
Foreign currency translation and other	59,656
Ending balance	$ 1,022,401
Weighted Average Amortization Period (years)	7 years
Developed Technology
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	$ 88,931
Amortization	(15,695)
Acquired	0
Post Acquisition Adjustments	0
Foreign currency translation and other	1,555
Ending balance	$ 74,791
Weighted Average Amortization Period (years)	6 years
Trade Names
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	$ 168,683
Amortization	(10,390)
Acquired	0
Post Acquisition Adjustments	0
Foreign currency translation and other	16,458
Ending balance	$ 174,751
Weighted Average Amortization Period (years)	17 years
Contracts and backlog intangible
Finite-lived Intangible Assets [Roll Forward]
Amortization	$ (177,821)

Goodwill and Intangibles - Sc_3

Goodwill and Intangibles - Schedule of Estimated Amortization Expense of Intangible Assets (Details) $ in Millions	Sep. 29, 2023 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2024	$ 203.3
2025	202.7
2026	180.1
2027	148.7
2028	140.8
Thereafter	396.3
Total	$ 1,271.9

Other Financial Information - S

Other Financial Information - Schedule of Components of Receivables and Contract Assets (Details) - USD ($) $ in Thousands	Sep. 29, 2023	Sep. 30, 2022
Components of receivables:
Amounts billed, net	$ 1,457,333	$ 1,400,088
Unbilled receivables and other	1,442,486	1,523,249
Contract assets	658,987	482,044
Total receivables and contract assets, net	3,558,806	3,405,381
Other information about receivables:
Amounts due from the United States federal government included above, net of contract liabilities	$ 802,566	$ 749,323

Other Financial Information -_2

Other Financial Information - Schedule of Property, Equipment and Improvements, Net (Details) - USD ($) $ in Thousands	Sep. 29, 2023	Sep. 30, 2022
Property, Plant and Equipment [Line Items]
Property, equipment and improvements, gross	$ 1,000,636	$ 904,594
Accumulated depreciation and amortization	(643,604)	(557,918)
Property, Equipment and Improvements, net	357,032	346,676
Land
Property, Plant and Equipment [Line Items]
Property, equipment and improvements, gross	477	478
Buildings
Property, Plant and Equipment [Line Items]
Property, equipment and improvements, gross	62,380	46,244
Equipment
Property, Plant and Equipment [Line Items]
Property, equipment and improvements, gross	719,167	643,805
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, equipment and improvements, gross	190,257	179,187
Construction in progress
Property, Plant and Equipment [Line Items]
Property, equipment and improvements, gross	$ 28,355	$ 34,880

Other Financial Information -_3

Other Financial Information - Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country (Details) - USD ($) $ in Thousands	Sep. 29, 2023	Sep. 30, 2022
Property, Plant and Equipment [Line Items]
Property, Equipment and Improvements, net	$ 357,032	$ 346,676
U.S. Plans
Property, Plant and Equipment [Line Items]
Property, Equipment and Improvements, net	203,358	226,639
Europe
Property, Plant and Equipment [Line Items]
Property, Equipment and Improvements, net	108,587	87,331
Canada
Property, Plant and Equipment [Line Items]
Property, Equipment and Improvements, net	4,812	5,210
Asia
Property, Plant and Equipment [Line Items]
Property, Equipment and Improvements, net	3,775	2,578
India
Property, Plant and Equipment [Line Items]
Property, Equipment and Improvements, net	12,583	9,659
Australia and New Zealand
Property, Plant and Equipment [Line Items]
Property, Equipment and Improvements, net	15,406	13,211
Middle East and Africa
Property, Plant and Equipment [Line Items]
Property, Equipment and Improvements, net	$ 8,511	$ 2,048

Other Financial Information -_4

Other Financial Information - Schedule of Components of Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 29, 2023	Sep. 30, 2022
Other Financial Information [Abstract]
Accrued payroll and related liabilities	$ 842,815	$ 947,547
Project-related accruals	27,814	28,178
Non project-related accruals and other	222,938	279,062
Insurance liabilities	63,536	63,183
Sales and other similar taxes	110,199	93,500
Dividends payable	34,342	30,292
Total	$ 1,301,644	$ 1,441,762

Other Financial Information -_5

Other Financial Information - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	$ 6,104,392	$ 5,974,837
Other comprehensive income (loss)	146,624	(183,211)
Reclassifications from other comprehensive income (loss)	(29,448)	2,523
Balance at the end of the period	6,600,082	6,104,392
Gain (loss), foreign currency transaction after tax	(67,500)	144,300
Interest rate and cross currency swaps to be reclassified during the next 12 months	22,600
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	(975,130)	(794,442)
Balance at the end of the period	(857,954)	(975,130)
Change in Pension and Retiree Medical Plan Liabilities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	(307,395)	(394,561)
Other comprehensive income (loss)	(18,485)	87,034
Reclassifications from other comprehensive income (loss)	188	132
Balance at the end of the period	(325,692)	(307,395)
Foreign Currency Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	(786,040)	(407,240)
Other comprehensive income (loss)	150,103	(378,800)
Reclassifications from other comprehensive income (loss)	0	0
Balance at the end of the period	(635,937)	(786,040)
Gain/(Loss) on Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	118,305	7,359
Other comprehensive income (loss)	15,006	108,555
Reclassifications from other comprehensive income (loss)	(29,636)	2,391
Balance at the end of the period	$ 103,675	$ 118,305

Income Taxes - Schedule of Comp

Income Taxes - Schedule of Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Current income tax (benefit) expense from continuing operations:
Federal	$ 70,895	$ (35,291)	$ 91,313
State	31,046	4,526	30,886
Foreign	171,055	79,822	38,959
Total current tax expense from continuing operations	272,996	49,057	161,158
Deferred income tax expense (benefit) from continuing operations:
Federal	(29,748)	56,526	35,109
State	2,448	17,178	21,826
Foreign	(49,515)	38,142	56,688
Total deferred tax expense from continuing operations	(76,815)	111,846	113,623
Consolidated income tax expense from continuing operations	$ 196,181	$ 160,903	$ 274,781

Income Taxes - Schedule of Co_2

Income Taxes - Schedule of Components of Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Sep. 29, 2023	Sep. 30, 2022
Obligations relating to:
Other employee benefit plans	$ 136,648	$ 138,897
Net operating losses	269,412	132,999
Foreign tax credit	68,874	83,697
Lease liability	126,893	138,635
Unrealized foreign exchange loss	32,090	46,005
Other	16,996	11,831
Valuation allowance	(200,389)	(113,483)
Gross deferred tax assets	450,524	438,581
Deferred tax liabilities:
Depreciation and amortization	(394,332)	(431,946)
Lease right of use asset	(62,640)	(71,658)
Partnership investment	(61,614)	(52,787)
Hedge investments	(34,045)	(38,994)
Unrealized foreign exchange gain	(31,205)	(45,754)
Other	(34,715)	(35,039)
Gross deferred tax liabilities	(618,551)	(676,178)
Net deferred tax liabilities	$ (168,027)	$ (237,597)

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021	Oct. 02, 2020
Income Tax Contingency [Line Items]
Valuation allowance	$ 200,389	$ 113,483
Increase (decrease) in valuation allowance	86,900
Net operating losses	269,412	132,999
Undistributed earnings of foreign subsidiaries	179,500
Amount of unrecognized deferred tax liability not recognized due to undistributed earnings of foreign subsidiaries	13,700
Unrecognized tax benefits	38,766	88,893	$ 113,633	$ 102,484
Reductions for tax positions of prior years	53,854	3,672	$ 4,851
Unrecognized tax benefits that would impact effective tax rate	33,600	73,500
Accrued interest and penalties	37,800	43,500
Decrease in unrecognized tax benefits	11,100
Operating Loss Carryforwards, Foreign Settlement
Income Tax Contingency [Line Items]
Increase (decrease) in valuation allowance	110,000
Change in Realizability of Foreign Tax Credits
Income Tax Contingency [Line Items]
Increase (decrease) in valuation allowance	(14,700)
Various Other Items
Income Tax Contingency [Line Items]
Increase (decrease) in valuation allowance	(8,400)
Affiliated Entity
Income Tax Contingency [Line Items]
Undistributed earnings of foreign subsidiaries	104,700
Amount of unrecognized deferred tax liability not recognized due to undistributed earnings of foreign subsidiaries	25,700
Accounting Standards Update 2013-11
Income Tax Contingency [Line Items]
Unrecognized tax benefits	33,500	81,900
Accounting Standards Update 2013-11 | Cumulative Effect, Period of Adoption, Adjustment
Income Tax Contingency [Line Items]
Unrecognized tax benefits	5,300	7,000
Foreign Country
Income Tax Contingency [Line Items]
Loss carry forwards of foreign subsidiaries	964,500	$ 491,300
Tax credit carryforward, amount	68,900
Tax credit carryforward, valuation allowance	32,200
Foreign Country | Expiring In 2024
Income Tax Contingency [Line Items]
Tax credit carryforward, amount	29,100
United States Federal Tax Authority
Income Tax Contingency [Line Items]
Reductions for tax positions of prior years	51,400
Unrecognized tax benefits, temporary item with no rate impact	$ 7,200

Income Taxes - Income Tax Benef

Income Taxes - Income Tax Benefits Realized from the Exercise of Nonqualified Stock Options, and Disqualifying Dispositions of Stock Sold Under our Employee Stock Purchase Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Income Tax Disclosure [Abstract]
Income tax benefits realized under stock plans	$ 3.9	$ 2.2	$ 9.9

Income Taxes - Schedule of Inco

Income Taxes - Schedule of Income Tax Expense in Consolidated Statements of Earnings (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Income Tax Disclosure [Abstract]
Statutory amount	$ 192,503	$ 184,033	$ 146,078
State taxes, net of the federal benefit	23,901	19,316	14,564
Exclusion of tax on non-controlling interests	(6,578)	(7,533)	(7,999)
Foreign:
Difference in tax rates of foreign operations	7,166	(2,516)	3,684
Expense/(benefit) from foreign valuation allowance change	(1,305)	2,982	2,148
Nondeductible compensation	0	0	48,727
U.S. tax cost (benefit) of foreign operations	78,216	48,843	35,228
Tax differential on foreign earnings	84,077	49,309	89,787
Foreign tax credits	(46,530)	(33,734)	(25,230)
Tax Rate Change	(9,913)	3,210	25,588
Valuation allowance	(7,169)	(59,121)	38,928
Uncertain tax positions	(38,844)	(1,439)	978
Other items:
Energy efficient commercial buildings deduction	736	(2,681)	(3,760)
Disallowed officer compensation	7,081	6,034	6,689
Stock compensation	(3,896)	(2,168)	(9,946)
Other items – net	813	5,677	(896)
Total other items	4,734	6,862	(7,913)
Consolidated income tax expense from continuing operations	$ 196,181	$ 160,903	$ 274,781
Statutory tax rate	21%	21%	21%
State taxes, net of the federal benefit	2.60%	2.20%	2.10%
Exclusion of tax on non-controlling interests	(0.70%)	(0.90%)	(1.10%)
Foreign:
Difference in tax rates of foreign operations	0.80%	(0.30%)	0.50%
Expense/(benefit) from foreign valuation allowance change	(0.10%)	0.30%	0.30%
Nondeductible compensation	0%	0%	7%
U.S. tax cost (benefit) of foreign operations	8.50%	5.60%	5.10%
Tax differential on foreign earnings	9.20%	5.60%	12.90%
Foreign tax credits	(5.10%)	(3.80%)	(3.60%)
Tax Rate Change	(1.10%)	0.40%	3.70%
Valuation allowance	(0.80%)	(6.70%)	5.60%
Uncertain tax positions	(4.20%)	(0.20%)	0.10%
Other items:
Energy efficient commercial buildings deduction	0.10%	(0.30%)	(0.50%)
Disallowed officer compensation	0.80%	0.70%	1%
Stock compensation	(0.40%)	(0.20%)	(1.40%)
Other items – net	0.10%	0.60%	(0.10%)
Total other items	0.50%	0.80%	(1.10%)
Taxes on income from continuing operations (percent)	21.40%	18.40%	39.50%

Income Taxes - Schedule of In_2

Income Taxes - Schedule of Income Tax Payments (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Income Tax Disclosure [Abstract]
Income tax payments	$ 204.2	$ 113.9	$ 75.6

Income Taxes - Schedule of Co_3

Income Taxes - Schedule of Components of our Consolidated Earnings Before Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Income Tax Examination [Line Items]
Results of operations, income before income taxes	$ 916,679	$ 876,347	$ 695,602
United States Federal Tax Authority
Income Tax Examination [Line Items]
Results of operations, income before income taxes	388,999	415,673	634,820
Foreign earnings
Income Tax Examination [Line Items]
Results of operations, income before income taxes	$ 527,680	$ 460,674	$ 60,782

Income Taxes - Schedule of Unre

Income Taxes - Schedule of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Income Tax Disclosure [Abstract]
Balance, beginning of year	$ 88,893	$ 113,633	$ 102,484
Acquisitions	0	192	7,639
Additions based on tax positions related to the current year	1,190	1,136	7,088
Additions for tax positions of prior years	2,537	1,207	1,711
Reductions for tax positions of prior years	(53,854)	(3,672)	(4,851)
Settlement	0	(23,603)	(438)
Balance, end of year	$ 38,766	$ 88,893	$ 113,633

Joint Ventures and VIE's - Sche

Joint Ventures and VIE's - Schedule of Summarized Financial Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Schedule of Equity Method Investments [Line Items]
Current assets	$ 4,690,353	$ 4,721,994
Total assets	14,617,109	14,660,419
Current liabilities	3,422,561	3,250,845
Gross profit	3,473,315	3,327,040	$ 3,043,772
Net earnings	719,656	715,412	430,829
Consolidated Entities
Schedule of Equity Method Investments [Line Items]
Revenue	1,431,700	1,253,800	1,037,300
Direct cost of contracts	(1,106,500)	(985,500)	(910,100)
Gross profit	325,200	268,300	127,200
Net earnings	87,300	92,300	$ 84,300
VIE, primary beneficiary | Consolidated Entities
Schedule of Equity Method Investments [Line Items]
Current assets	424,200	353,900
Non-Current assets	0	0
Total assets	424,200	353,900
Current liabilities	279,800	228,100
Total liabilities	$ 279,800	$ 228,100

Joint Ventures and VIE's - Narr

Joint Ventures and VIE's - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 01, 2021	Sep. 29, 2023	Sep. 30, 2022
Variable Interest Entity [Line Items]
VIE unconsolidated assets		$ 14,617,109	$ 14,660,419
AWE ML
Variable Interest Entity [Line Items]
Impairment of equity method investment and other long term assets	$ 38,500
C3.ai. Inc.
Variable Interest Entity [Line Items]
Gain on sale of stock	49,600
VIE, not primary beneficiary | Unconsolidated Joint Venture
Variable Interest Entity [Line Items]
Investment in equity securities		49,600	56,600
Equity method investments exceeds its share of venture net assets	$ 60,900	33,600	36,500
Accounts receivable from unconsolidated joint venture		16,100	21,100
VIE, not primary beneficiary | Proportionate Consolidated Joint Venture
Variable Interest Entity [Line Items]
VIE unconsolidated assets		132,000	109,300
VIE unconsolidated liabilities		$ 128,900	$ 129,200

Borrowings - Schedule of Long-t

Borrowings - Schedule of Long-term Debt (Details) $ in Thousands			12 Months Ended
	Aug. 18, 2023	Feb. 16, 2023	Sep. 29, 2023 USD ($)	Sep. 29, 2023 GBP (£)	Sep. 30, 2022 USD ($)	Sep. 29, 2023 GBP (£)
Debt Instrument [Line Items]
Total Long-term debt, net			$ 2,813,471		$ 3,357,256
Less: Current Portion			(51,773)		(50,415)
Less: Deferred Financing Fees			(13,172)		(3,466)
2021 Term Loan Facility - USD Portion
Debt Instrument [Line Items]
Total Long-term debt, net			$ 120,000		$ 200,000
2021 Term Loan Facility - USD Portion | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Interest rate, effective percentage			6.68%			6.68%
2021 Term Loan Facility - USD Portion | Secured Overnight Financing Rate (SOFR) | Minimum
Debt Instrument [Line Items]
Margin added to variable rate interest rate			0.975%	0.975%
2021 Term Loan Facility - USD Portion | Secured Overnight Financing Rate (SOFR) | Maximum
Debt Instrument [Line Items]
Margin added to variable rate interest rate			1.725%	1.725%
2021 Term Loan Facility - USD Portion | Base Interest Rate | Minimum
Debt Instrument [Line Items]
Margin added to variable rate interest rate			0%	0%
2021 Term Loan Facility - USD Portion | Base Interest Rate | Maximum
Debt Instrument [Line Items]
Margin added to variable rate interest rate			0.625%	0.625%
2021 Term Loan Facility - USD Portion | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Interest rate, effective percentage					4.06%
2021 Term Loan Facility - GBP Portion
Debt Instrument [Line Items]
Total Long-term debt, net			$ 794,170		$ 723,580
2021 Term Loan Facility - GBP Portion | Sterling Overnight Interbank Average Rate (SONIA)
Debt Instrument [Line Items]
Interest rate, effective percentage			6.47%		3.60%	6.47%
2021 Term Loan Facility - GBP Portion | Sterling Overnight Interbank Average Rate (SONIA) | Minimum
Debt Instrument [Line Items]
Margin added to variable rate interest rate			0.908%	0.908%	1.658%
2020 Term Loan Facility
Debt Instrument [Line Items]
Total Long-term debt, net			$ 854,246		$ 882,263
Quarterly principal payment, percent of aggregate borrowings			1.25%			1.25%
Quarterly principal payment			$ 9,125	£ 3,125,000
2020 Term Loan Facility | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Interest rate, effective percentage			6.68%			6.68%
2020 Term Loan Facility | Secured Overnight Financing Rate (SOFR) | Minimum
Debt Instrument [Line Items]
Margin added to variable rate interest rate			0.975%	0.975%
2020 Term Loan Facility | Secured Overnight Financing Rate (SOFR) | Maximum
Debt Instrument [Line Items]
Margin added to variable rate interest rate			1.725%	1.725%
2020 Term Loan Facility | Base Interest Rate | Minimum
Debt Instrument [Line Items]
Margin added to variable rate interest rate			0%	0%
2020 Term Loan Facility | Base Interest Rate | Maximum
Debt Instrument [Line Items]
Margin added to variable rate interest rate			0.625%	0.625%
2020 Term Loan Facility | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Interest rate, effective percentage					4.49%
2020 Term Loan Facility | Sterling Overnight Interbank Average Rate (SONIA)
Debt Instrument [Line Items]
Interest rate, effective percentage			6.47%		3.60%	6.47%
2020 Term Loan Facility | Sterling Overnight Interbank Average Rate (SONIA) | Minimum
Debt Instrument [Line Items]
Margin added to variable rate interest rate			0.908%	0.908%	1.658%
Senior Notes | 5.90% Bonds
Debt Instrument [Line Items]
Total Long-term debt, net			$ 500,000		$ 0
Stated interest rate		5.90%	5.90%			5.90%
Debt instrument, interest rate, increase (decrease)		0.35%
Senior Notes | 5.90% Bonds | First Step Up Date
Debt Instrument [Line Items]
Stated interest rate			5.90%			5.90%
Margin added to variable rate interest rate			6.025%	6.025%
Debt instrument, interest rate, increase (decrease)			0.125%	0.125%
Interest rate payable period			15 days	15 days
Senior Notes | 5.90% Bonds | Second Step Up Date
Debt Instrument [Line Items]
Stated interest rate			5.90%			5.90%
Margin added to variable rate interest rate			6.15%	6.15%
Debt instrument, interest rate, increase (decrease)			0.125%	0.125%
Interest rate payable period			15 days	15 days
Senior Notes | 6.35% Bonds
Debt Instrument [Line Items]
Total Long-term debt, net			$ 600,000		0
Stated interest rate	6.35%		6.35%			6.35%
Debt instrument, interest rate, increase (decrease)	3,000%
Senior Notes | Senior Notes, Series A
Debt Instrument [Line Items]
Total Long-term debt, net			$ 0		190,000
Stated interest rate			4.27%			4.27%
Senior Notes | Senior Notes, Series B
Debt Instrument [Line Items]
Total Long-term debt, net			$ 0		180,000
Stated interest rate			4.42%			4.42%
Senior Notes | Senior Notes, Series C
Debt Instrument [Line Items]
Total Long-term debt, net			$ 0		130,000
Stated interest rate			4.52%			4.52%
Revolving Credit Facility
Debt Instrument [Line Items]
Total Long-term debt, net			$ 10,000		$ 1,105,294	£ 0
Revolving Credit Facility | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Interest rate, effective percentage			8.75%			8.75%
Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) | Minimum
Debt Instrument [Line Items]
Margin added to variable rate interest rate			0.975%	0.975%
Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) | Maximum
Debt Instrument [Line Items]
Margin added to variable rate interest rate			1.725%	1.725%
Revolving Credit Facility | Base Interest Rate | Minimum
Debt Instrument [Line Items]
Margin added to variable rate interest rate			0%	0%
Revolving Credit Facility | Base Interest Rate | Maximum
Debt Instrument [Line Items]
Margin added to variable rate interest rate			0.625%	0.625%
Revolving Credit Facility | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Interest rate, effective percentage					4.08%
Revolving Credit Facility | Sterling Overnight Interbank Average Rate (SONIA) | Minimum
Debt Instrument [Line Items]
Margin added to variable rate interest rate			0.908%	0.908%
Revolving Credit Facility | Sterling Overnight Interbank Average Rate (SONIA) | Maximum
Debt Instrument [Line Items]
Margin added to variable rate interest rate			1.658%	1.658%
Revolving Credit Facility | 5.90% Bonds
Debt Instrument [Line Items]
Stated interest rate			5.90%			5.90%
Revolving Credit Facility | 6.35% Bonds
Debt Instrument [Line Items]
Stated interest rate			6.35%			6.35%

Borrowings - Narrative (Details

Borrowings - Narrative (Details) $ in Thousands

1 Months Ended

3 Months Ended

12 Months Ended

Aug. 18, 2023 USD ($)

Feb. 16, 2023 USD ($)

Feb. 06, 2023 USD ($)

Feb. 06, 2023 GBP (£)

Mar. 07, 2019

Dec. 31, 2022 USD ($)

Dec. 30, 2022 USD ($)

Sep. 29, 2023 USD ($)

Sep. 30, 2022 USD ($) derivative_agreement

Oct. 01, 2021 USD ($)

Sep. 29, 2023 GBP (£)

Feb. 13, 2023 USD ($)

Mar. 25, 2020 USD ($)

Mar. 25, 2020 GBP (£)

Mar. 12, 2018 USD ($) series

Debt Instrument [Line Items]

Proceeds from long-term borrowings

$ 3,860,468

$ 3,145,500

$ 4,445,080

Total long-term debt, net

2,813,471

$ 3,357,256

Number of senior notes series | series

3

Treasury Lock

Debt Instrument [Line Items]

Number of instruments held | derivative_agreement

2

Derivative, notional amount

$ 500,000

Line of Credit

Debt Instrument [Line Items]

Letters of credit outstanding

322,000

Senior Notes

Debt Instrument [Line Items]

Repayments of senior debt

$ 19,000

$ 481,000

Fixed Rate Date | Treasury Lock

Debt Instrument [Line Items]

Aggregate principal amount

$ 500,000

Derivative, fixed interest rate

5.90%

2021 Term Loan Facility

Debt Instrument [Line Items]

Proceeds from long-term borrowings

$ 200,000

£ 650,000,000

Line of credit facility, amount outstanding

$ 80,000

2020 Term Loan Facility

Debt Instrument [Line Items]

Aggregate principal amount

$ 730,000

2020 Term Loan Facility | Subsidiaries

Debt Instrument [Line Items]

Aggregate principal amount | £

£ 250,000,000

5.90% Bonds | Senior Notes

Debt Instrument [Line Items]

Aggregate principal amount

$ 500,000

Stated interest rate

5.90%

5.90%

5.90%

Debt instrument, interest rate, increase (decrease)

0.35%

Debt instrument, redemption price, percentage

100%

Total long-term debt, net

$ 500,000

0

5.90% Bonds | Senior Notes | First Step Up Date

Debt Instrument [Line Items]

Stated interest rate

5.90%

5.90%

Debt instrument, interest rate, increase (decrease)

0.125%

5.90% Bonds | Senior Notes | Second Step Up Date

Debt Instrument [Line Items]

Stated interest rate

5.90%

5.90%

Debt instrument, interest rate, increase (decrease)

0.125%

6.35% Bonds | Senior Notes

Debt Instrument [Line Items]

Aggregate principal amount

$ 600,000

Stated interest rate

6.35%

6.35%

6.35%

Debt instrument, interest rate, increase (decrease)

3,000%

Debt instrument, redemption price, percentage

100%

Total long-term debt, net

$ 600,000

0

Senior Notes As Amended Note Purchase Agreement

Debt Instrument [Line Items]

Total long-term debt, net

$ 500,000

$1.6 Billion Revolving Credit Facility

Debt Instrument [Line Items]

Available borrowing capacity

2,240,000

Revolving Credit Facility

Debt Instrument [Line Items]

Total long-term debt, net

$ 10,000

$ 1,105,294

£ 0

Revolving Credit Facility | Unsecured Revolving Credit Facility February 6, 2023

Debt Instrument [Line Items]

Credit facility, maximum borrowing capacity

$ 2,250,000

Revolving Credit Facility | Second Amendment to the Revolving Credit Facility

Debt Instrument [Line Items]

Debt instrument, covenant, leverage ratio, maximum

3.50

Debt Instrument, Covenant, leverage ratio, temporary maximum

4

Revolving Credit Facility | Second Amendment to the Revolving Credit Facility | Minimum

Debt Instrument [Line Items]

Line of credit facility, unused capacity, commitment fee percentage

0.10%

Revolving Credit Facility | Second Amendment to the Revolving Credit Facility | Maximum

Debt Instrument [Line Items]

Line of credit facility, unused capacity, commitment fee percentage

0.25%

Revolving Credit Facility | 2021 Term Loan Facility

Debt Instrument [Line Items]

Debt instrument, covenant, leverage ratio, maximum

3.50

Debt Instrument, Covenant, leverage ratio, temporary maximum

4

Revolving Credit Facility | 2020 Term Loan Facility

Debt Instrument [Line Items]

Debt instrument, covenant, leverage ratio, maximum

3.50

Debt Instrument, Covenant, leverage ratio, temporary maximum

4

Revolving Credit Facility | 5.90% Bonds

Debt Instrument [Line Items]

Stated interest rate

5.90%

5.90%

Long-term debt fair value

$ 475,700

Revolving Credit Facility | 6.35% Bonds

Debt Instrument [Line Items]

Stated interest rate

6.35%

6.35%

Long-term debt fair value

$ 598,400

Letter of Credit

Debt Instrument [Line Items]

Credit facility, maximum borrowing capacity

$ 400,000

Letter of Credit | $1.6 Billion Revolving Credit Facility

Debt Instrument [Line Items]

Line of credit facility, amount outstanding

900

Letter of Credit | Committed And Uncommitted Letter Of Credit Facility

Debt Instrument [Line Items]

Line of credit facility, amount outstanding

$ 321,100

Sub Facility Of Swing Line Loans

Debt Instrument [Line Items]

Credit facility, maximum borrowing capacity

$ 100,000

Borrowings - Schedule of Intere

Borrowings - Schedule of Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Debt Disclosure [Abstract]
Interest paid	$ 207,604	$ 88,031	$ 54,860

Leases - Schedule of Lease Cost

Leases - Schedule of Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Leases [Abstract]
Operating lease cost	$ 141,116	$ 151,134	$ 160,026
Variable lease cost	37,375	36,631	31,727
Sublease income	(17,972)	(15,207)	(12,359)
Total lease cost	$ 160,519	$ 172,558	$ 179,394

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flow (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022
Leases [Abstract]
Cash paid for amounts included in the measurements of lease liabilities	$ 182,831	$ 229,275
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 76,210	$ 38,110
Weighted average remaining lease term - operating leases	5 years 10 months 24 days	6 years 3 months 18 days
Weighted average discount rate - operating leases	3.20%	2.80%

Leases - Schedule of Operating

Leases - Schedule of Operating Lease Maturity (Details) $ in Thousands	Sep. 29, 2023 USD ($)
Leases [Abstract]
2024	$ 172,405
2025	142,232
2026	118,411
2027	97,226
2028	80,278
Thereafter	156,537
Remaining lease payments under operating leases	767,089
Less Interest	(71,782)
Operating lease liabilities	$ 695,307

Leases - Narrative (Details)

Leases - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Lessee, Lease, Description [Line Items]
Impairment of real estate	$ 48,200
Impairment of equity method investment and other long-term assets	48,163	$ 78,292	$ 40,640
CH2M HILL Companies, Ltd.
Lessee, Lease, Description [Line Items]
Impairment of real estate	48,200
Right-of-Use Lease Asset
Lessee, Lease, Description [Line Items]
Impairment of equity method investment and other long-term assets	42,200	60,700
Other Long-Lived Assets
Lessee, Lease, Description [Line Items]
Impairment of equity method investment and other long-term assets	$ 6,000	$ 17,700

Employee Stock Purchase and S_3

Employee Stock Purchase and Stock Incentive Plans - Schedule of Employee Stock Ownership Plan (ESOP) Disclosures (Details) - USD ($)	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Discount (percent) available to employees on the purchase of common stock	5%
Aggregate Purchase Price Paid for Shares Sold (in shares)	$ 40,195,000	$ 38,648,000	$ 32,149,000
Aggregate Number of Shares Sold (in shares)	355,007	302,429	287,587
Number of remaining shares reserved for issuance (in shares)	3,355,813
ESPP's
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of remaining shares reserved for issuance (in shares)	2,520,441

Employee Stock Purchase and S_4

Employee Stock Purchase and Stock Incentive Plans - Schedule of Stock Incentive Plans (Details) $ in Millions	12 Months Ended
	Sep. 29, 2023 USD ($) shares	Sep. 30, 2022 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	30,950,000
Number of remaining shares reserved for issuance (in shares)	3,355,813
Number of shares relating to outstanding stock options (in shares)	118,350
Number of shares available for future awards (in shares)	3,237,463	4,047,827
2023 SIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	29,850,000
Number of remaining shares reserved for issuance (in shares)	3,151,532
Number of shares relating to outstanding stock options (in shares)	61,125
Number of shares available for future awards (in shares)	3,090,407	3,886,740
2023 SIP | Other Than Option Stock Appreciation Rights SARS
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award number of shares, fungible share basis (in shares)	1.92
Award number of shares, non-fungible share basis (in shares)	1
2023 SIP | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of awards not yet recognized | $	$ 126.3
Exercisable options outstanding, weighted average remaining contractual life (years)	2 years 8 months 12 days
1999 ODSP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	1,100,000
Number of remaining shares reserved for issuance (in shares)	204,281
Number of shares relating to outstanding stock options (in shares)	57,225
Number of shares available for future awards (in shares)	147,056	161,087
Award number of shares, non-fungible share basis (in shares)	1

Employee Stock Purchase and S_5

Employee Stock Purchase and Stock Incentive Plans - Schedule of Share-based Compensation, Stock Options, Activity (Details) - $ / shares	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of stock options outstanding, beginning balance (in shares)	439,349	573,984	706,489
Number of stock options, Granted (in shares)		150,951
Number of stock options, Exercised (in shares)	(215,649)	(284,502)	(130,030)
Number of stock options, Canceled or expired (in shares)	(6,219)	(1,084)	(2,475)
Number of stock options outstanding, ending balance (in shares)	217,481	439,349	573,984
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted Average Exercise Price, beginning balance (in dollars per share)	$ 35.77	$ 45.65	$ 45.91
Weighted Average Exercise Price, Granted (in dollars per share)		12.79
Weighted Average Exercise Price, Exercised (in dollars per share)	40.61	43.56	47.07
Weighted Average Exercise Price, Canceled or expired (in dollars per share)	19.73	21.34	45.18
Weighted Average Exercise Price, ending balance (in dollars per share)	$ 31.43	$ 35.77	$ 45.65

Employee Stock Purchase and S_6

Employee Stock Purchase and Stock Incentive Plans - Schedule Of Intrinsic Value Of Options (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Share-Based Payment Arrangement [Abstract]
Intrinsic value of stock options exercised	$ 17,635	$ 28,149	$ 9,693
Intrinsic value of options exercisable	$ 18,400

Employee Stock Purchase and S_7

Employee Stock Purchase and Stock Incentive Plans - Schedule of 2023 SIP, 1999 OSDP and StreetLight Plan (Details) - $ / shares	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
At fiscal year end:
Range of exercise prices for options outstanding, minimum (in dollars per share)	$ 5.64	$ 5.64	$ 37.03
Range of exercise prices for options outstanding, maximum (in dollars per share)	$ 60.43	$ 60.43	$ 60.43
Number of options exercisable (in shares)	180,911	367,624	573,984
For the fiscal year:
Range of prices relating to options exercised, minimum (in dollars per share)	$ 7.05	$ 11.27	$ 32.51
Range of prices relating to options exercised, maximum (in dollars per share)	$ 60.43	$ 60.43	$ 60.43

Employee Stock Purchase and S_8

Employee Stock Purchase and Stock Incentive Plans - Schedule Of Information Regarding Outstanding Options (Details) - $ / shares	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021	Oct. 02, 2020
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Options Outstanding, Number (in shares)	217,481	439,349	573,984	706,489
Options Outstanding, Weighted Average Remaining Contractual Life (years)	3 years 8 months 12 days
Options Outstanding, Weighted Average Price (in dollars per share)	$ 31.43	$ 35.77	$ 45.65	$ 45.91
Options Exercisable, Number (in shares)	217,481
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 31.43
Range of exercise prices for options outstanding, minimum (in dollars per share)	5.64	5.64	37.03
Range of exercise prices for options outstanding, maximum (in dollars per share)	$ 60.43	$ 60.43	$ 60.43
$0.00 - $37.03
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Options Outstanding, Number (in shares)	99,131
Options Outstanding, Weighted Average Remaining Contractual Life (years)	6 years 5 months 26 days
Options Outstanding, Weighted Average Price (in dollars per share)	$ 12.57
Options Exercisable, Number (in shares)	99,131
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 12.57
Range of exercise prices for options outstanding, minimum (in dollars per share)	0
Range of exercise prices for options outstanding, maximum (in dollars per share)	$ 37.03
$37.03 - $46.09
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Options Outstanding, Number (in shares)	71,750
Options Outstanding, Weighted Average Remaining Contractual Life (years)	1 year 10 months 17 days
Options Outstanding, Weighted Average Price (in dollars per share)	$ 41.80
Options Exercisable, Number (in shares)	71,750
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 41.80
Range of exercise prices for options outstanding, minimum (in dollars per share)	37.03
Range of exercise prices for options outstanding, maximum (in dollars per share)	$ 46.09
$46.09 - $55.13
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Options Outstanding, Number (in shares)	31,375
Options Outstanding, Weighted Average Remaining Contractual Life (years)	7 months 24 days
Options Outstanding, Weighted Average Price (in dollars per share)	$ 53.19
Options Exercisable, Number (in shares)	31,375
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 53.19
Range of exercise prices for options outstanding, minimum (in dollars per share)	46.09
Range of exercise prices for options outstanding, maximum (in dollars per share)	$ 55.13
$55.13 - $80.63
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Options Outstanding, Number (in shares)	15,225
Options Outstanding, Weighted Average Remaining Contractual Life (years)	5 months 1 day
Options Outstanding, Weighted Average Price (in dollars per share)	$ 60.43
Options Exercisable, Number (in shares)	15,225
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 60.43
Range of exercise prices for options outstanding, minimum (in dollars per share)	55.13
Range of exercise prices for options outstanding, maximum (in dollars per share)	$ 80.63

Employee Stock Purchase and S_9

Employee Stock Purchase and Stock Incentive Plans - Schedule of Number of Shares of Restricted Stock and Restricted Stock Units Issued Under the 2023 SIP and StreetLight Plan (Details) - shares	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Two Thousand Twenty-Three And Street Light Plan | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock and restricted stock units issued (in shares)	0	818	0
Two Thousand Twenty-Three And Street Light Plan | Restricted Stock Units (RSUs) | Service Condition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock and restricted stock units issued (in shares)	996,345	290,582	380,722
Two Thousand Twenty-Three And Street Light Plan | Restricted Stock Units (RSUs) | Service Market And Performance Conditions at Target
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock and restricted stock units issued (in shares)	126,595	176,470	181,132
2023 SIP | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock and restricted stock units canceled (in shares)	0	0	0
Restricted stock and restricted stock units outstanding (in shares)	0
2023 SIP | Restricted Stock Units (RSUs) | Service Condition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock and restricted stock units canceled (in shares)	94,249	57,366	201,967
Restricted stock and restricted stock units outstanding (in shares)	1,341,150
2023 SIP | Restricted Stock Units (RSUs) | Service Market And Performance Conditions at Target
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock and restricted stock units canceled (in shares)	39,295	31,966	218,520
Restricted stock and restricted stock units outstanding (in shares)	488,588
1999 ODSP | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock and restricted stock units outstanding (in shares)	0
1999 ODSP | Restricted Stock Units (RSUs) | Service Condition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock and restricted stock units issued (in shares)	14,031	13,785	17,680
Restricted stock and restricted stock units outstanding (in shares)	60,359

Employee Stock Purchase and _10

Employee Stock Purchase and Stock Incentive Plans - Schedule of fair value of shares of the 2023 SIP and StreetLight Plan (Details) - Restricted Stock Units (RSUs) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of shares vested	$ 54,315	$ 45,755	$ 46,869
2023 SIP | Service Condition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of shares vested	32,255	23,077	20,374
2023 SIP | Service Market And Performance Conditions at Target
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of shares vested	$ 22,060	$ 22,678	$ 26,495

Employee Stock Purchase and _11

Employee Stock Purchase and Stock Incentive Plans - Schedule of Unvested Restricted Stock and Restricted Stock Units Roll Forward (Details) - $ / shares	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Granted (in shares)		150,951
Restricted Stock And Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Beginning balance outstanding (in shares)	1,375,429
Granted (in shares)	1,192,105
Vested (in shares)	(543,827)
Canceled (in shares)	(133,559)
Ending balance outstanding (in shares)	1,890,148	1,375,429
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Beginning balance outstanding (in dollars per share)	$ 110.64
Granted (in dollars per share)	122.41
Vested (in dollars per share)	102.14
Canceled (in dollars per share)	121.89
Ending balance outstanding (in dollars per share)	$ 119.71	$ 110.64

Employee Stock Purchase and _12

Employee Stock Purchase and Stock Incentive Plans - Narrative (Details) $ in Millions	12 Months Ended
	Sep. 29, 2023 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from stock options exercised	$ 7.5
1999 ODSP, 2023 and Street Light Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercisable options outstanding, weighted average remaining contractual life (years)	2 years 10 months 24 days

Savings and Deferred Compensa_3

Savings and Deferred Compensation Plans - Schedule of Savings Plans Contributions (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Savings And Deferred Compensation Plans [Abstract]
Savings plans contributions	$ 203,438	$ 184,399	$ 132,865

Savings and Deferred Compensa_4

Savings and Deferred Compensation Plans - Schedule of Deferred Compensation Plans Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Savings And Deferred Compensation Plans [Abstract]
Deferred compensation plans expense	$ 4,679	$ 1,697	$ 2,900
Deferred compensation arrangement investments	$ 168,615	$ 165,118

Pension and Other Postretirem_3

Pension and Other Postretirement Benefit Plans - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Defined Benefit Plan Disclosure [Line Items]
Loss on pension and retiree medical plan changes	$ 208	$ 123	$ 2,783
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Period of annual average returns used in return on plan assets simulation model (in years)	20 years
U.S. Plans | Sverdrup and Ireland Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Loss on pension and retiree medical plan changes	$ 200	$ 100

Pension and Other Postretirem_4

Pension and Other Postretirement Benefit Plans - Schedule of Change in Plans' Combined Net Benefit Obligation (Details) - Pension Plan - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
U.S. Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Net benefit obligation at the beginning of the year	$ 299,503	$ 404,820
Service cost	140	236	$ 456
Interest cost	15,629	10,350	10,221
Participants’ contributions	0	0
Actuarial gains	(6,533)	(85,067)
Benefits paid	(26,887)	(25,565)
Curtailments/settlements/plan amendments	0	(5,271)
Effect of exchange rate changes and other, net	0	0
Net benefit obligation at the end of the year	281,852	299,503	404,820
Non-U.S. Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Net benefit obligation at the beginning of the year	1,365,466	2,375,640
Service cost	6,926	6,480	6,568
Interest cost	74,077	42,328	38,907
Participants’ contributions	143	249
Actuarial gains	(176,207)	(651,798)
Benefits paid	(76,739)	(74,378)
Curtailments/settlements/plan amendments	(1,313)	(2,641)
Effect of exchange rate changes and other, net	107,908	(330,414)
Net benefit obligation at the end of the year	$ 1,300,261	$ 1,365,466	$ 2,375,640

Pension and Other Postretirem_5

Pension and Other Postretirement Benefit Plans - Schedule of Change in Combined Fair Value of Plans' Assets (Details) - Pension Plan - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022
U.S. Plans
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at the beginning of the year	$ 286,193	$ 385,521
Actual returns (losses) on plan assets	18,310	(68,585)
Employer contributions	85	93
Participants’ contributions	0	0
Gross benefits paid	(27,005)	(25,565)
Curtailments/settlements/plan amendments	0	(5,271)
Effect of exchange rate changes and other, net	0	0
Fair value of plan assets at the end of the year	277,583	286,193
Non-U.S. Plans
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at the beginning of the year	1,297,625	2,203,495
Actual returns (losses) on plan assets	(103,324)	(557,972)
Employer contributions	28,991	33,032
Participants’ contributions	143	249
Gross benefits paid	(77,070)	(74,378)
Curtailments/settlements/plan amendments	(1,313)	(2,641)
Effect of exchange rate changes and other, net	97,973	(304,160)
Fair value of plan assets at the end of the year	$ 1,243,025	$ 1,297,625

Pension and Other Postretirem_6

Pension and Other Postretirement Benefit Plans - Schedule of Reconciliation of Combined Funded Status of Plans and Recognized in Consolidated Balance Sheet (Details) - Pension Plan - USD ($) $ in Thousands	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net benefit obligation at the end of the year	$ 281,852	$ 299,503	$ 404,820
Fair value of plan assets at the end of the year	277,583	286,193	385,521
Underfunded amount recognized at the end of the year	4,269	13,310
Non-U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net benefit obligation at the end of the year	1,300,261	1,365,466	2,375,640
Fair value of plan assets at the end of the year	1,243,025	1,297,625	$ 2,203,495
Underfunded amount recognized at the end of the year	$ 57,236	$ 67,841

Pension and Other Postretirem_7

Pension and Other Postretirement Benefit Plans - Schedule of Accumulated Benefit Obligation (Details) - Pension Plan - USD ($) $ in Thousands	Sep. 29, 2023	Sep. 30, 2022
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation at the end of the year	$ 280,956	$ 299,347
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation at the end of the year	$ 1,285,980	$ 1,355,717

Pension and Other Postretirem_8

Pension and Other Postretirement Benefit Plans - Schedule of Amount Recognized in Accompanying Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 29, 2023	Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Liabilities relating to defined benefit pension and retirement plans	$ 258,540	$ 271,332
Pension Plan | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Prepaid benefit cost included in noncurrent assets	758	0
Accrued benefit cost included in current liabilities	80	83
Liabilities relating to defined benefit pension and retirement plans	4,947	13,227
Net amount recognized at the end of the year	4,269	13,310
Pension Plan | Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Prepaid benefit cost included in noncurrent assets	57,678	54,897
Accrued benefit cost included in current liabilities	5,182	4,359
Liabilities relating to defined benefit pension and retirement plans	109,732	118,379
Net amount recognized at the end of the year	$ 57,236	$ 67,841

Pension and Other Postretirem_9

Pension and Other Postretirement Benefit Plans - Schedule of Significant Actuarial Assumptions in Determining the Funded Status and Benefit Cost (Details) - Pension Plan	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Rates of compensation increases	3.50%	3.50%	3.50%
Minimum | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rates	5.80%	4.20%	2.30%
Expected long-term rates of return on assets	4.80%	5.50%	4.70%
Minimum | Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rates	3.80%	2.40%	0.60%
Rates of compensation increases	2.80%	2.50%	2.40%
Expected long-term rates of return on assets	5.30%	3.30%	2%
Maximum | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rates	5.90%	5.50%	2.80%
Expected long-term rates of return on assets	7%	6.40%	5.10%
Maximum | Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rates	6.90%	7.40%	6.60%
Rates of compensation increases	9%	9%	7.50%
Expected long-term rates of return on assets	7.60%	7.50%	7%

Pension and Other Postretire_10

Pension and Other Postretirement Benefit Plans - Schedule of Pension Plans Recognized in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Reclassification adjustments:
Total	$ 18,297	$ (87,166)	$ (104,165)
Pension Plan | U.S. Plans
Arising during the period:
Net actuarial (gains) losses	(4,032)	578	(25,109)
Prior service cost	0	0	0
Total	(4,032)	578	(25,109)
Reclassification adjustments:
Net actuarial gains (losses)	1,335	(2,157)	(3,204)
Prior service benefit	(324)	(324)	(325)
Total	1,011	(2,481)	(3,529)
Total	(3,021)	(1,903)	(28,638)
Pension Plan | Non-U.S. Plans
Arising during the period:
Net actuarial (gains) losses	27,188	(78,705)	(65,547)
Prior service cost	0	0	0
Total	27,188	(78,705)	(65,547)
Reclassification adjustments:
Net actuarial gains (losses)	(4,802)	(5,492)	(8,761)
Prior service benefit	(1,068)	(1,066)	(1,219)
Total	(5,870)	(6,558)	(9,980)
Total	$ 21,318	$ (85,263)	$ (75,527)

Pension and Other Postretire_11

Pension and Other Postretirement Benefit Plans - Schedule of Pension Plans Recorded in Accumulated Other Comprehensive Loss Not Yet Recognized as Component of Net Periodic Pension Cost (Details) - Pension Plan - USD ($) $ in Thousands	Sep. 29, 2023	Sep. 30, 2022
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Net actuarial losses	$ 34,940	$ 37,638
Prior service cost	373	697
Total	35,313	38,335
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Net actuarial losses	269,671	248,716
Prior service cost	20,708	20,344
Total	$ 290,379	$ 269,060

Pension and Other Postretire_12

Pension and Other Postretirement Benefit Plans - Schedule of Accumulated Comprehensive Income Amortized Against Earnings in the Next Year (Details) - Pension Plan $ in Thousands	Sep. 29, 2023 USD ($)
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Unrecognized net actuarial (gains) losses	$ (1,384)
Unrecognized prior service cost	431
Accumulated comprehensive (gains) losses to be recorded against earnings	(953)
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Unrecognized net actuarial (gains) losses	7,261
Unrecognized prior service cost	1,488
Accumulated comprehensive (gains) losses to be recorded against earnings	$ 8,749

Pension and Other Postretire_13

Pension and Other Postretirement Benefit Plans - Schedule of Weighted Average Measurement of Assets and Liabilities (Details) - Pension Plan	Sep. 29, 2023	Sep. 30, 2022
Equity securities | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, actual allocation, percentage	3%	2%
Equity securities | Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, actual allocation, percentage	16%	15%
Debt securities | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, actual allocation, percentage	65%	66%
Debt securities | Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, actual allocation, percentage	50%	49%
Real estate investments | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, actual allocation, percentage	0%	0%
Real estate investments | Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, actual allocation, percentage	10%	11%
Other | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, actual allocation, percentage	32%	32%
Other | Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, actual allocation, percentage	24%	25%

Pension and Other Postretire_14

Pension and Other Postretirement Benefit Plans - Schedule of Fair Value of Pension Plan Assets (Details) - Pension Plan - USD ($) $ in Thousands	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	$ 277,583	$ 286,193	$ 385,521
U.S. Plans | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	101,880	164,032
U.S. Plans | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	175,703	122,161
U.S. Plans | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	0	0
U.S. Plans | Equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	8,172	6,708
U.S. Plans | Equities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	8,172	6,708
U.S. Plans | Equities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	0	0
U.S. Plans | Equities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	0	0
U.S. Plans | Domestic bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	155,772	171,357
U.S. Plans | Domestic bonds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	3,803	64,396
U.S. Plans | Domestic bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	151,969	106,961
U.S. Plans | Domestic bonds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	0	0
U.S. Plans | Overseas bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	23,734	15,200
U.S. Plans | Overseas bonds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	0	0
U.S. Plans | Overseas bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	23,734	15,200
U.S. Plans | Overseas bonds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	0	0
U.S. Plans | Cash and equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	17,841	19,025
U.S. Plans | Cash and equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	17,841	19,025
U.S. Plans | Cash and equivalents | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	0	0
U.S. Plans | Cash and equivalents | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	0	0
U.S. Plans | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	72,064	73,903
U.S. Plans | Mutual funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	72,064	73,903
U.S. Plans | Mutual funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	0	0
U.S. Plans | Mutual funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	0	0
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	1,243,025	1,297,625	2,203,495
Non-U.S. Plans | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	21,568	9,667
Non-U.S. Plans | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	770,469	774,480
Non-U.S. Plans | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	250,532	321,702
Non-U.S. Plans | Investments measured at Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	200,456	191,776
Non-U.S. Plans | Equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	51,004	44,194
Non-U.S. Plans | Equities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	0	0
Non-U.S. Plans | Equities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	50,243	42,655
Non-U.S. Plans | Equities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	0	0
Non-U.S. Plans | Equities | Investments measured at Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	761	1,539
Non-U.S. Plans | Overseas equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	154,500	150,869
Non-U.S. Plans | Overseas equities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	0	0
Non-U.S. Plans | Overseas equities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	74,377	74,056
Non-U.S. Plans | Overseas equities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	0	0
Non-U.S. Plans | Overseas equities | Investments measured at Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	80,123	76,813
Non-U.S. Plans | Domestic bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	30,505	38,448
Non-U.S. Plans | Domestic bonds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	0	0
Non-U.S. Plans | Domestic bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	30,505	38,448
Non-U.S. Plans | Domestic bonds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	0	0
Non-U.S. Plans | Overseas bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	585,565	597,594
Non-U.S. Plans | Overseas bonds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	0	0
Non-U.S. Plans | Overseas bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	520,322	532,697
Non-U.S. Plans | Overseas bonds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	0	0
Non-U.S. Plans | Overseas bonds | Investments measured at Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	65,243	64,897
Non-U.S. Plans | Cash and equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	22,002	11,502
Non-U.S. Plans | Cash and equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	21,568	9,667
Non-U.S. Plans | Cash and equivalents | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	434	1,835
Non-U.S. Plans | Cash and equivalents | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	0	0
Non-U.S. Plans | Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	124,099	143,903
Non-U.S. Plans | Real estate | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	0	0
Non-U.S. Plans | Real estate | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	4,145	4,076
Non-U.S. Plans | Real estate | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	84,755	102,868	116,936
Non-U.S. Plans | Real estate | Investments measured at Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	35,199	36,959
Non-U.S. Plans | Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	87,160	80,231
Non-U.S. Plans | Insurance contracts | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	0	0
Non-U.S. Plans | Insurance contracts | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	0	0
Non-U.S. Plans | Insurance contracts | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	87,160	80,231	133,802
Non-U.S. Plans | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	97,747	150,171
Non-U.S. Plans | Hedge funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	0	0
Non-U.S. Plans | Hedge funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	0	0
Non-U.S. Plans | Hedge funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	78,617	138,603	$ 231,319
Non-U.S. Plans | Hedge funds | Investments measured at Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	19,130	11,568
Non-U.S. Plans | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	90,443	80,713
Non-U.S. Plans | Mutual funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	0	0
Non-U.S. Plans | Mutual funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	90,443	80,713
Non-U.S. Plans | Mutual funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the end of the year	$ 0	$ 0

Pension and Other Postretire_15

Pension and Other Postretirement Benefit Plans - Schedule of Changes in the Fair Value of Plans' Level 3 Assets (Details) - Pension Plan - Non-U.S. Plans - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at the beginning of the year	$ 1,297,625	$ 2,203,495
Effect of exchange rate changes	(97,973)	304,160
Fair value of plan assets at the end of the year	1,243,025	1,297,625
Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at the beginning of the year	321,702
Fair value of plan assets at the end of the year	250,532	321,702
Real estate investments
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at the beginning of the year	143,903
Fair value of plan assets at the end of the year	124,099	143,903
Real estate investments | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at the beginning of the year	102,868	116,936
Net purchases, sales, and settlements	(35,119)	(8,686)
Realized and unrealized gains (losses)	12,842	14,701
Effect of exchange rate changes	4,164	(20,083)
Fair value of plan assets at the end of the year	84,755	102,868
Insurance contracts
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at the beginning of the year	80,231
Fair value of plan assets at the end of the year	87,160	80,231
Insurance contracts | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at the beginning of the year	80,231	133,802
Net purchases, sales, and settlements	8,587	(6,312)
Realized and unrealized gains (losses)	(13,555)	(24,770)
Effect of exchange rate changes	11,897	(22,489)
Fair value of plan assets at the end of the year	87,160	80,231
Hedge funds
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at the beginning of the year	150,171
Fair value of plan assets at the end of the year	97,747	150,171
Hedge funds | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at the beginning of the year	138,603	231,319
Net purchases, sales, and settlements	(56,624)	(11,553)
Realized and unrealized gains (losses)	(11,532)	(42,964)
Effect of exchange rate changes	8,170	(38,199)
Fair value of plan assets at the end of the year	$ 78,617	$ 138,603

Pension and Other Postretire_16

Pension and Other Postretirement Benefit Plans - Schedule of Anticipated Cash Contributions (Details) - Pension Plan $ in Thousands	12 Months Ended
	Sep. 29, 2023 USD ($)
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Anticipated cash contributions	$ 0
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Anticipated cash contributions	$ 19,281

Pension and Other Postretire_17

Pension and Other Postretirement Benefit Plans - Schedule of Expected Payments to Participants in Pension Plan (Details) - Pension Plan $ in Thousands	Sep. 29, 2023 USD ($)
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
2024	$ 29,761
2025	28,452
2026	27,682
2027	26,269
2028	25,568
For the periods 2029 through 2033	111,361
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
2024	77,160
2025	79,545
2026	80,028
2027	86,229
2028	85,878
For the periods 2029 through 2033	$ 441,520

Pension and Other Postretire_18

Pension and Other Postretirement Benefit Plans - Schedule of Components of Net Periodic Pension Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Nonoperating Income (Expense)	Nonoperating Income (Expense)	Nonoperating Income (Expense)
Pension Plan | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 140	$ 236	$ 456
Interest cost	15,629	10,350	10,221
Expected return on plan assets	(19,496)	(16,933)	(15,932)
Actuarial (gains) losses	(1,770)	2,861	4,249
Prior service cost	430	430	431
Net pension cost (income), before special items	(5,067)	(3,056)	(575)
Curtailment expense/Settlement (gains) losses	0	(206)	(64)
Total net periodic pension cost (income) recognized	(5,067)	(3,262)	(639)
Pension Plan | Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	6,926	6,480	6,568
Interest cost	74,077	42,328	38,907
Expected return on plan assets	(73,387)	(71,875)	(90,346)
Actuarial (gains) losses	6,317	7,147	10,834
Prior service cost	1,424	1,421	1,519
Net pension cost (income), before special items	15,357	(14,499)	(32,518)
Curtailment expense/Settlement (gains) losses	208	329	2,847
Total net periodic pension cost (income) recognized	$ 15,565	$ (14,170)	$ (29,671)

Pension and Other Postretire_19

Pension and Other Postretirement Benefit Plans - Schedule of Contribution to Multiemployer Pension Plans (Details) - Pension Plan - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Multiemployer Plans [Line Items]
Contributions to multiemployer pension plans	$ 5,922	$ 12,586	$ 13,029
Europe
Multiemployer Plans [Line Items]
Contributions to multiemployer pension plans	1,530	1,548	1,713
U.S. Plans
Multiemployer Plans [Line Items]
Contributions to multiemployer pension plans	$ 4,392	$ 11,038	$ 11,316

PA Consulting Business Combin_3

PA Consulting Business Combination - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Mar. 02, 2021	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Business Acquisition [Line Items]
Repurchase of redeemable noncontrolling interests		$ 92,939	$ 46,074	$ 0
Proceeds from issuances of redeemable noncontrolling interests		34,016	49,742	0
Preferred redeemable noncontrolling interests redemption value adjustment		$ (8,340)	0	$ 57,307
Preference share effect on basic earnings per share (in dollars per share)		$ 0.07		$ 0.44
PA Consulting Employees
Business Acquisition [Line Items]
Proceeds from issuances of redeemable noncontrolling interests		$ 34,000	$ 49,700
Ownership interest of employees	35%	69%	65%
PA Consulting Group Limited
Business Acquisition [Line Items]
Percentage of outstanding shares of common and preferred stock acquired	65%
Consideration transferred	$ 1,700,000
Redeemable noncontrolling interests had a fair value	582,400
Goodwill recognized expected to be deductible for tax purposes	$ 0
Business acquisitions pro forma income tax expense (benefit)				$ 330,700
Allocated share-based compensation expense		$ 800	$ 3,300
Cash in employee benefit trust		$ 2,800	$ 13,700
Remaining percentage of outstanding shares of common and preferred stock acquired	35%
PA Consulting Group Limited | Customer Relationships, Contracts And Backlog And Trade names
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	12 years
PA Consulting Group Limited | Minimum | Customer Relationships, Contracts And Backlog And Trade names
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	9 years
PA Consulting Group Limited | Maximum | Customer Relationships, Contracts And Backlog And Trade names
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	20 years

PA Consulting Business Combin_4

PA Consulting Business Combinations - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Sep. 29, 2023	Sep. 30, 2022	Mar. 02, 2021
Assets
Goodwill	$ 7,343,526	$ 7,184,658
PA Consulting Group Limited
Assets
Cash and cash equivalents			$ 134,900
Receivables			166,500
Property, equipment and improvements, net			40,500
Goodwill			1,454,000
Identifiable intangible assets			1,004,200
Prepaid expenses and other current assets			9,500
Miscellaneous long-term assets			84,000
Total Assets			2,893,600
Liabilities
Accounts payable			6,500
Accrued liabilities and other current liabilities			354,800
Other long-term liabilities			248,000
Total Liabilities			609,300
Redeemable Noncontrolling interests			582,400
Net assets acquired			$ 1,701,900

PA Consulting Business Combin_5

PA Consulting Business Combinations - Schedule of Unaudited Proforma Operating Results (Details) - PA Consulting Group Limited $ / shares in Units, $ in Millions	12 Months Ended
	Oct. 01, 2021 USD ($) $ / shares
Business Acquisition [Line Items]
Revenues	$ 14,504.3
Net earnings of the Group	695.1
Net earnings attributable to Jacobs	$ 548
Net earnings attributable to Jacobs per share:
Basic earnings (loss) per share (in dollars per share) | $ / shares	$ 4.21
Diluted earnings (loss) per share (in dollars per share) | $ / shares	$ 4.17
Business acquisitions pro forma income tax expense (benefit)	$ 330.7

PA Consulting Business Combin_6

PA Consulting Business Combination - Schedule of Change in Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Redeemable noncontrolling interest, beginning balance	$ 44,336
Attribution of Preferred Dividend to Common Shareholders	(22,739)	$ (27,248)	$ (44,372)
Redeemable noncontrolling interest, ending balance	53,862	44,336
PA Consulting Employees
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Redeemable noncontrolling interest, beginning balance	632,522	657,722
Accrued Preferred Dividend to Preference Shareholders	72,891	67,598
Attribution of Preferred Dividend to Common Shareholders	(72,891)	(67,598)
Net earnings attributable to redeemable noncontrolling interest to Common Shareholders	21,614	34,585
Redeemable Noncontrolling interests redemption value adjustment	10,770	27,657
Repurchase of redeemable noncontrolling interests	(111,005)	(53,834)
Issuance of redeemable noncontrolling interests	37,789	54,884
Cumulative translation adjustment and other	41,289	(88,492)
Redeemable noncontrolling interest, ending balance	$ 632,979	$ 632,522	$ 657,722

Other Business Combinations - N

Other Business Combinations - Narrative (Details) - USD ($)	Feb. 04, 2022	Nov. 19, 2021	Nov. 24, 2020
Contracts and backlog intangible
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life			9 years
Data And Customer Relationships
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life			9 years
StreetLightData, Inc.
Business Acquisition [Line Items]
Transferred liabilities incurred	$ 1,000,000
Business combination consideration paid in cash	190,800,000
Business combination consideration equity issued	900,000
Money stock options	5,200,000
Goodwill recognized expected to be deductible for tax purposes	$ 0
StreetLightData, Inc. | Technology
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	5 years
StreetLightData, Inc. | Customer Relationships, Contracts and Backlog
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	4 years
StreetLightData, Inc. | Contracts and backlog intangible
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	9 years
BlackLynx
Business Acquisition [Line Items]
Transferred liabilities incurred		$ 5,300,000
Business combination consideration paid in cash		235,400,000
Business combination, recognized identifiable assets acquired and liabilities assumed, noncurrent liabilities, long-term debt		5,300,000
Goodwill recognized expected to be deductible for tax purposes		$ 0
BlackLynx | Technology
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life		8 years
BlackLynx | Contracts and backlog intangible
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life		4 years
Buffalo Group
Business Acquisition [Line Items]
Business combination consideration paid in cash			$ 182,400,000
Business combination, recognized identifiable assets acquired and liabilities assumed, noncurrent liabilities, long-term debt			7,700,000
Consideration transferred			190,100,000
Contingent consideration			$ 7,700,000

Other Business Combinations - S

Other Business Combinations - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Sep. 29, 2023	Sep. 30, 2022	Feb. 04, 2022	Nov. 19, 2021	Nov. 24, 2020
Assets
Goodwill	$ 7,343,526	$ 7,184,658
StreetLightData, Inc.
Assets
Cash and cash equivalents			$ 7,300
Receivables			5,200
Property, equipment and improvements, net			100
Goodwill			116,400
Identifiable intangible assets			105,100
Prepaid expenses and other current assets			2,000
Total Assets			236,100
Liabilities
Accounts payable, accrued expenses and other current liabilities			23,100
Other long-term liabilities			16,100
Total Liabilities			39,200
Net assets acquired			$ 196,900
BlackLynx
Assets
Cash and cash equivalents				$ 5,100
Receivables				7,700
Property, equipment and improvements, net				800
Goodwill				195,800
Identifiable intangible assets				51,100
Prepaid expenses and other current assets				3,200
Total Assets				263,700
Liabilities
Accounts payable, accrued expenses and other current liabilities				19,500
Other long-term liabilities				8,800
Total Liabilities				28,300
Net assets acquired				$ 235,400
Buffalo Group
Assets
Cash and cash equivalents					$ 8,400
Receivables					19,200
Property, equipment and improvements, net					2,300
Goodwill					130,700
Identifiable intangible assets					74,000
Prepaid expenses and other current assets					6,200
Total Assets					240,800
Liabilities
Accounts payable, accrued expenses and other current liabilities					46,900
Other long-term liabilities					3,800
Total Liabilities					50,700
Net assets acquired					$ 190,100

Restructuring and Other Charg_3

Restructuring and Other Charges - Schedule of Restructuring and Other Charges Impacts on Reportable Segment Income by Line of Business (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 85,728
Recorded third-party environmental recoveries receivable		$ 27,000
Gain on termination of lease		8,700
AWE ML
Restructuring Cost and Reserve [Line Items]
Gain on termination of lease	3,400	8,700
Impairment of equity method investment			$ 38,500
Operating Segments | Professional Services and Employee Separation Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	63,400
Operating Segments | Employee Separation Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	14,300
Operating Segments | PA Consulting | Employee Separation Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	14,300
CH2M HILL Companies, Ltd.
Restructuring Cost and Reserve [Line Items]
Restructuring charges	133,035	161,063	99,590
Pre-tax settlement less insurance recoveries		91,300
Impairment of real estate including other moving costs	50,700	78,300	2,400
CH2M HILL Companies, Ltd. | Operating profit (mainly Selling, General and Administrative costs (“SG&A")
Restructuring Cost and Reserve [Line Items]
Restructuring charges	136,411	173,555	61,042
CH2M HILL Companies, Ltd. | Other (Income) Expense, net
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(3,376)	(12,492)	38,548
CH2M HILL Companies, Ltd. | Operating Segments | Critical Mission Solutions
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3,143	5,626	5,079
CH2M HILL Companies, Ltd. | Operating Segments | People & Places Solutions
Restructuring Cost and Reserve [Line Items]
Restructuring charges	55,749	64,204	7,077
CH2M HILL Companies, Ltd. | Operating Segments | Divergent Solutions
Restructuring Cost and Reserve [Line Items]
Restructuring charges	8,307	0	0
CH2M HILL Companies, Ltd. | Operating Segments | PA Consulting
Restructuring Cost and Reserve [Line Items]
Restructuring charges	14,706	4,253	15,566
CH2M HILL Companies, Ltd. | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 51,130	$ 86,980	$ 71,868

Restructuring and Other Charg_4

Restructuring and Other Charges - Schedule of Accrual for Restructuring and Other Costs (Details) $ in Thousands	12 Months Ended
	Sep. 29, 2023 USD ($)
Restructuring Reserve [Roll Forward]
Balance at September 30, 2022	$ 4,137
Net Charges	85,728
Payments & Usage	(52,547)
Balance at September 29, 2023	37,318
Real Estate Impairments and Other Transformation Activities
Restructuring Reserve [Roll Forward]
Net Charges	$ 47,300

Restructuring and Other Charg_5

Restructuring and Other Charges - Schedule of Restructuring and Other Activities by Major Type of Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Restructuring Cost and Reserve [Line Items]
Recorded third-party environmental recoveries receivable		$ 27,000
AWE ML
Restructuring Cost and Reserve [Line Items]
Impairment of equity method investment			$ 38,500
CH2M HILL Companies, Ltd.
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 133,035	161,063	99,590
Pre-tax settlement less insurance recoveries		91,300
Lease Abandonments and Impairments | CH2M HILL Companies, Ltd.
Restructuring Cost and Reserve [Line Items]
Restructuring costs	46,195	69,802	4,282
Voluntary and Involuntary Terminations | CH2M HILL Companies, Ltd.
Restructuring Cost and Reserve [Line Items]
Restructuring costs	41,435	5,635	15,773
Outside Services | CH2M HILL Companies, Ltd.
Restructuring Cost and Reserve [Line Items]
Restructuring costs	36,030	22,340	35,210
Other | CH2M HILL Companies, Ltd.
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 9,375	$ 63,286	$ 44,325

Restructuring and Other Charg_6

Restructuring and Other Charges - Schedule of Cumulative Amounts Incurred for Restructuring and Other Activities Costs (Details) $ in Thousands	Sep. 29, 2023 USD ($)
Restructuring Cost and Reserve [Line Items]
Cumulative amounts incurred to date	$ 1,165,178
Lease Abandonments and Impairments
Restructuring Cost and Reserve [Line Items]
Cumulative amounts incurred to date	432,724
Voluntary and Involuntary Terminations
Restructuring Cost and Reserve [Line Items]
Cumulative amounts incurred to date	182,191
Outside Services
Restructuring Cost and Reserve [Line Items]
Cumulative amounts incurred to date	347,950
Other
Restructuring Cost and Reserve [Line Items]
Cumulative amounts incurred to date	$ 202,313

Commitments and Contingencies_2

Commitments and Contingencies and Derivative Financial Instruments - Narrative (Details) $ in Millions		12 Months Ended
	Feb. 13, 2023 USD ($)	Sep. 29, 2023 USD ($)	Sep. 30, 2022 USD ($) derivative_agreement
Letter of Credit | $1.6 Billion Revolving Credit Facility
Loss Contingencies [Line Items]
Line of credit facility, amount outstanding		$ 0.9
Letter of Credit | Committed And Uncommitted Letter Of Credit Facility
Loss Contingencies [Line Items]
Line of credit facility, amount outstanding		321.1
Surety Bond
Loss Contingencies [Line Items]
Letters of credit outstanding		2,000
Line of Credit
Loss Contingencies [Line Items]
Letters of credit outstanding		322
Treasury Lock
Loss Contingencies [Line Items]
Number of instruments held | derivative_agreement			2
Derivative, notional amount			$ 500
Pre-tax gain	$ 37.4
Derivative assets (liabilities), at fair value			40.9
Unrealized gain (loss) on derivatives		26.5	30.8
Treasury Lock | Fixed Rate Date
Loss Contingencies [Line Items]
Derivative, fixed interest rate	5.90%
Aggregate principal amount	$ 500
Interest Rate Swap
Loss Contingencies [Line Items]
Derivative, notional amount		769.1
Unrealized gain (loss) on derivatives		77.2
Cross Currency Interest Rate Contract
Loss Contingencies [Line Items]
Derivative, notional amount		$ 127.8
Cross Currency Interest Rate Contract | Minimum
Loss Contingencies [Line Items]
Term of contract		3 years 6 months
Cross Currency Interest Rate Contract | Maximum
Loss Contingencies [Line Items]
Term of contract		10 years
Cross Currency Interest Rate Contract and Interest Rate Swamp
Loss Contingencies [Line Items]
Derivative assets (liabilities), at fair value		$ 102.6	128.2
Interest Rate Swap and Cross Currency Interest Rate Contract
Loss Contingencies [Line Items]
Unrealized gain (loss) on derivatives			87.5
Foreign Exchange Forward
Loss Contingencies [Line Items]
Derivative, notional amount		857.7	298.2
Derivative assets (liabilities), at fair value		9.5	(3.2)
Derivative settled			66.7
Foreign Exchange Forward | Accounts Payable
Loss Contingencies [Line Items]
Derivative assets (liabilities), at fair value		(6.6)	(6.3)
Foreign Exchange Forward | Total Other Non-current Assets
Loss Contingencies [Line Items]
Derivative assets (liabilities), at fair value			2.8
Foreign Exchange Forward | Other Current Assets
Loss Contingencies [Line Items]
Derivative assets (liabilities), at fair value		$ 16.1	$ 0.3
Foreign Exchange Forward | Minimum
Loss Contingencies [Line Items]
Term of contract		1 month
Foreign Exchange Forward | Maximum
Loss Contingencies [Line Items]
Term of contract		4 months

Contractual Guarantees, Litig_2

Contractual Guarantees, Litigation, Investigations, and Insurance (Details) $ in Millions, $ in Millions			12 Months Ended
	Apr. 12, 2022 AUD ($)	Apr. 12, 2022 USD ($)	Sep. 30, 2022 USD ($)	Sep. 28, 2012 MW	Dec. 22, 2008 case
Loss Contingencies [Line Items]
Recorded third-party environmental recoveries receivable			$ 27
JKC Australia L N G Pty Limited
Loss Contingencies [Line Items]
Litigation settlement amount awarded to other party		$ 475
General Electric And G E Electrical International Incorporation
Loss Contingencies [Line Items]
Plant capacity (in MW) | MW				360
Litigation settlement amount awarded to other party	$ 640
Gain (loss) related to settlement			$ 91.3
Kingston Power Plant of the TVA, Secondary Case No. 3:13CV-505-TAV-HBG
Loss Contingencies [Line Items]
Number of cases | case					10
UGL Infrastructure Pty Limited | Consortium Agreement
Loss Contingencies [Line Items]
Ownership percentage				50%

Segment Information - Narrative

Segment Information - Narrative (Details)	3 Months Ended	12 Months Ended
	Dec. 30, 2022 line_of_business operating_segment	Sep. 29, 2023 operating_segment
Segment Reporting [Abstract]
Number of operating segments | operating_segment	4	4
Number of global lines of business | line_of_business	2

Segment Information - Schedule

Segment Information - Schedule of Total Services Revenues for Reportable Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Segment Reporting Information [Line Items]
Revenues	$ 16,352,414	$ 14,922,825	$ 14,092,632
Critical Mission Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	4,693,499	4,376,562	4,251,690
People & Places Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	9,553,857	8,534,650	8,364,640
Divergent Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	946,914	892,317	848,901
PA Consulting | Operating Segments
Segment Reporting Information [Line Items]
Revenues	$ 1,158,144	$ 1,119,296	$ 627,401

Segment Information - Schedul_2

Segment Information - Schedule of Total Revenues, Segment Operating Profit and Total Asset for Reporting Segment (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 29, 2023	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Segment Reporting Information [Line Items]
Total Segment Operating Profit		$ 1,075,237	$ 917,850	$ 688,089
Restructuring, Transaction and Other Charges		(152,396)	(197,884)	(350,394)
Total Other (Expense) Income, net		(158,558)	(41,503)	7,513
Earnings from Continuing Operations Before Taxes		916,679	876,347	695,602
Legal settlement charges				19,500
Amortization of intangible assets		203,906
Restructuring charges		85,728
Impairment of real estate		48,200
Recorded third-party environmental recoveries receivable			27,000
Cost incurred in investment				297,800
Gain related to cost-method Investments			13,900
Gain on termination of lease			8,700
C3.ai. Inc.
Segment Reporting Information [Line Items]
Fair value adjustments				(49,600)
AWE ML
Segment Reporting Information [Line Items]
Gain on termination of lease		3,400	8,700
Impairment of equity method investment and other long term assets				(38,500)
ECR Business
Segment Reporting Information [Line Items]
Fair value adjustments				34,700
JKC Australia L N G Pty Limited | Settled Litigation
Segment Reporting Information [Line Items]
Pre-tax settlement less insurance recoveries			(91,300)
Operating Segments
Segment Reporting Information [Line Items]
Total Segment Operating Profit		1,654,686	1,480,174	1,378,612
Operating Segments | Professional Services and Employee Separation Costs
Segment Reporting Information [Line Items]
Restructuring charges		63,400
Operating Segments | Employee Separation Costs
Segment Reporting Information [Line Items]
Restructuring charges		14,300
Corporate Non Segment
Segment Reporting Information [Line Items]
Other Corporate Expenses		(427,053)	(364,440)	(340,129)
Corporate Non Segment | Other Expense
Segment Reporting Information [Line Items]
Amortization of intangible assets		203,900	198,600	149,800
Compensation expense, excluding cost of good and service sold		15,000
Compensation expense, employee benefit program costs	$ 41,000
Technology platform and personnel and corporate overhead costs	$ 26,000
Critical Mission Solutions | Operating Segments
Segment Reporting Information [Line Items]
Total Segment Operating Profit		378,201	355,563	359,001
People & Places Solutions | Operating Segments
Segment Reporting Information [Line Items]
Total Segment Operating Profit		957,714	824,834	780,514
Divergent Solutions | Operating Segments
Segment Reporting Information [Line Items]
Total Segment Operating Profit		81,768	67,552	88,026
PA Consulting | Operating Segments
Segment Reporting Information [Line Items]
Total Segment Operating Profit		237,003	$ 232,225	$ 151,071
PA Consulting | Operating Segments | Employee Separation Costs
Segment Reporting Information [Line Items]
Restructuring charges		$ 14,300