Jacobs Engineering (J) 10-K 24 Nov 14 2014 FY Annual report Financial data

Document_And_Entity_Informatio

Document And Entity Information (USD $)	12 Months Ended
In Billions, except Share data, unless otherwise specified	Sep. 26, 2014	Nov. 18, 2014	Mar. 28, 2014
Document And Entity Information [Abstract]	'	'	'
Document Type	'10-K	'	'
Amendment Flag	'false	'	'
Document Period End Date	26-Sep-14	'	'
Document Fiscal Year Focus	'2014	'	'
Document Fiscal Period Focus	'FY	'	'
Trading Symbol	'jec	'	'
Entity Registrant Name	'JACOBS ENGINEERING GROUP INC /DE/	'	'
Entity Central Index Key	'0000052988	'	'
Current Fiscal Year End Date	'--09-26	'	'
Entity Filer Category	'Large Accelerated Filer	'	'
Entity Common Stock, Shares Outstanding	'	130,552,640	'
Entity Public Float	'	'	$8.30
Entity Current Reporting Status	'Yes	'	'
Entity Voluntary Filers	'No	'	'
Entity Well-known Seasoned Issuer	'Yes	'	'

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Sep. 26, 2014	Sep. 27, 2013
In Thousands, unless otherwise specified
Current Assets:	'	'
Cash and cash equivalents	$732,647	$1,256,405
Receivables	2,867,555	2,548,990
Deferred income taxes	169,893	131,086
Prepaid expenses and other current assets	121,976	103,077
Total current assets	3,892,071	4,039,558
Property, Equipment, and Improvements, Net	456,797	379,296
Other Noncurrent Assets:	'	'
Goodwill	3,026,349	2,022,831
Intangibles	440,192	217,904
Miscellaneous	638,250	614,555
Total other noncurrent assets	4,104,791	2,855,290
Assets, Total	8,453,659	7,274,144
Current Liabilities:	'	'
Notes payable	36,732	22,783
Accounts payable	622,875	457,893
Accrued liabilities	1,279,556	1,029,816
Billings in excess of costs	410,683	345,097
Income taxes payable	0	32,030
Total current liabilities	2,349,846	1,887,619
Long-term Debt	764,075	415,086
Other Deferred Liabilities	834,078	723,104
Commitments and Contingencies	'	'
Capital stock:	'	'
Preferred stock, $1 par value, authorized—1,000,000 shares; issued and outstanding—none	0	0
Common stock, $1 par value, authorized—240,000,000 shares; issued and outstanding—131,752,768 shares and 131,639,196 shares, respectively	131,753	131,639
Additional paid-in capital	1,173,858	1,084,624
Retained earnings	3,527,193	3,300,961
Accumulated other comprehensive loss	-363,549	-304,127
Total Jacobs stockholders’ equity	4,469,255	4,213,097
Noncontrolling interests	36,405	35,238
Total Group stockholders’ equity	4,505,660	4,248,335
Liabilities and Stockholders' Equity, Total	$8,453,659	$7,274,144

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 26, 2014	Sep. 27, 2013
Statement of Financial Position [Abstract]	'	'
Preferred stock, par value (in dollars per share)	$1	$1
Preferred stock, authorized (in shares)	1,000,000	1,000,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$1	$1
Common stock, authorized (in shares)	240,000,000	240,000,000
Common stock, issued (in shares)	131,752,768	131,639,196
Common stock, outstanding (in shares)	131,752,768	131,639,196

Consolidated_Statements_Of_Ear

Consolidated Statements Of Earnings (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 26, 2014		Sep. 27, 2013		Sep. 28, 2012
Income Statement [Abstract]	'		'		'
Revenues	$12,695,157		$11,818,376		$10,893,778
Costs and Expenses:	'		'		'
Direct costs of contracts	-10,621,373		-9,976,057		-9,166,789
Selling, general and administrative expenses	-1,545,716		-1,173,340		-1,130,916
Operating Profit	528,068	[1]	668,979	[1]	596,073	[1]
Other Income (Expense)':	'		'		'
Interest income	9,693		5,395		6,049
Interest expense	-11,437		-12,906		-11,686
Gain on sale of intellectual property	12,147		0		6,292
Miscellaneous income (expense), net	3,695		80		-3,392
Total other income (expense), net	14,098		-7,431		-2,737
Earnings Before Taxes	542,166		661,548		593,336
Income Tax Expense	-190,054		-221,366		-202,382
Net Earnings of the Group	352,112		440,182		390,954
Net Earnings Attributable to Noncontrolling Interests	-24,004		-17,089		-12,000
Net Earnings Attributable to Jacobs	$328,108		$423,093		$378,954	[2]
Net Earnings Per Share:	'		'		'
Basic (in dollars per share)	$2.51		$3.27		$2.97	[2]
Diluted (in dollars per share)	$2.48		$3.23		$2.94	[2]
[1]	Operating profit represents revenues less (i) direct costs of contracts, and (ii) selling, general and administrative expenses.
[2]	Includes an after-tax gain of $4.0 million, or $0.03 per diluted share, related to the sale of the Company's intellectual property for iron ore pelletizing and certain other related assets.

Consolidated_Statements_Of_Com

Consolidated Statements Of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Statement of Comprehensive Income [Abstract]	'	'	'
Net Earnings of the Group	$352,112	$440,182	$390,954
Other Comprehensive (Loss) Income:	'	'	'
Foreign currency translation adjustments	-33,316	-23,704	30,038
Change in pension liability	-15,303	4,496	-100,385
Gains (losses) on cash flow hedges	1,022	1,467	3,567
Other Comprehensive (Loss) Income Before Income Taxes	-47,597	-17,741	-66,780
Income Tax Benefit (Expense):	'	'	'
Foreign currency translation adjustments	3,250	0	-750
Change in pension liability	-14,562	-3,949	24,443
Gains (losses) on cash flow hedges	-513	-550	-1,262
Total Income Tax Benefit (Expense)	-11,825	-4,499	22,431
Net Other Comprehensive Income (Loss)	-59,422	-22,240	-44,349
Net Comprehensive Income of the Group	292,690	417,942	346,605
Net Comprehensive Income Attributable to Noncontrolling Interests	-24,004	-17,089	-12,000
Total Comprehensive Income Attributable to Jacobs	$268,686	$400,853	$334,605

Consolidated_Statements_Of_Sto

Consolidated Statements Of Stockholders' Equity (USD $)	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comp- rehensive Income (Loss)	Total Jacobs Stock- holders’ Equity	Non- controlling Interests
In Thousands, unless otherwise specified
Balances at Sep. 30, 2011	$3,323,385	$127,785	$858,460	$2,564,281	($237,538)	$3,312,988	$10,397
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'	'
Net earnings	390,954	'	'	378,954	'	378,954	12,000
Foreign currency translation adjustments, net of deferred tax	29,288	'	'	'	29,288	29,288	'
Pension liability, net of deferred tax	-75,942	'	'	'	-75,942	-75,942	'
Gain on derivatives, net of deferred tax	2,305	'	'	'	2,305	2,305	'
Noncontrolling interest acquired / consolidated	11,557	'	'	-3,971	'	-3,971	15,528
Distributions to noncontrolling interests	-5,376	'	'	'	'	'	-5,376
Contributions from noncontrolling interests	3,867	'	'	'	'	'	3,867
Issuances of equity securities, net of deferred tax	109,200	2,706	106,494	0	'	109,200	'
Repurchases of equity securities	-30,349	-555	-10,971	-18,823	'	-30,349	'
Balances at Sep. 28, 2012	3,758,889	129,936	953,983	2,920,441	-281,887	3,722,473	36,416
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'	'
Net earnings	440,182	'	'	423,093	'	423,093	17,089
Foreign currency translation adjustments, net of deferred tax	-23,704	'	'	'	-23,704	-23,704	'
Pension liability, net of deferred tax	547	'	'	'	547	547	'
Gain on derivatives, net of deferred tax	917	'	'	'	917	917	'
Noncontrolling interest acquired / consolidated	794	'	11,087	'	'	11,087	-10,293
Distributions to noncontrolling interests	-7,974	'	'	'	'	'	-7,974
Contributions from noncontrolling interests	0	'	'	'	'	'	0
Issuances of equity securities, net of deferred tax	140,456	2,864	137,592	'	'	140,456	'
Repurchases of equity securities	-61,772	-1,161	-18,038	-42,573	'	-61,772	'
Balances at Sep. 27, 2013	4,248,335	131,639	1,084,624	3,300,961	-304,127	4,213,097	35,238
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'	'
Net earnings	352,112	'	'	328,108	'	328,108	24,004
Foreign currency translation adjustments, net of deferred tax	-30,066	'	'	'	-30,066	-30,066	'
Pension liability, net of deferred tax	-29,865	'	'	'	-29,865	-29,865	'
Gain on derivatives, net of deferred tax	509	'	'	'	509	509	'
Noncontrolling interest acquired / consolidated	-12,945	'	4,779	'	'	4,779	-17,724
Distributions to noncontrolling interests	-6,081	'	'	-968	'	-968	-5,113
Contributions from noncontrolling interests	-15,704	'	'	-15,704	'	-15,704	'
Issuances of equity securities, net of deferred tax	117,207	2,254	114,953	'	'	117,207	'
Repurchases of equity securities	-117,842	-2,140	-30,498	-85,204	'	-117,842	'
Balances at Sep. 26, 2014	$4,505,660	$131,753	$1,173,858	$3,527,193	($363,549)	$4,469,255	$36,405

Consolidated_Statements_Of_Sto1

Consolidated Statements Of Stockholders' Equity (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Statement of Stockholders' Equity [Abstract]	'	'	'
Deferred tax expense, Foreign currency translation adjustments	$3,250	$0	($750)
Deferred tax benefit, Pension liability	-14,562	-3,949	24,443
Deferred tax expense, Other comprehensive income (loss), Gain on derivatives	-513	-550	-1,262
Deferred tax benefit, Issuances equity securities	($1,264)	($3,111)	'

Consolidated_Statements_Of_Cas

Consolidated Statements Of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Cash Flows from Operating Activities:	'	'	'
Net earnings attributable to the Group	$352,112	$440,182	$390,954
Depreciation and amortization:	'	'	'
Property, equipment and improvements	98,592	69,889	58,890
Intangible assets	46,820	28,985	41,934
Gain on sale of intellectual property	-12,147	0	-6,292
Stock based compensation	43,400	39,518	32,442
Tax deficiency (benefit) from stock based compensation	1,344	3,213	-3,957
Equity in earnings of investees	-8,394	-14,140	-8,980
Change in pension plan obligations	-37,218	-8,714	-28,351
Change in deferred compensation plans	-7,062	-8,915	-5,474
(Gains) Losses on sales of assets, net	-4,668	519	811
Changes in assets and liabilities, excluding the effects of businesses acquired:	'	'	'
Receivables	107,944	-234,864	-227,123
Prepaid expenses and other current assets	-7,217	-15,898	-19,265
Accounts payable	108,241	82,389	10,673
Accrued liabilities	-2,172	-18,214	80,806
Billings in excess of costs	29,833	84,043	-15,626
Income taxes payable	-17,373	-5,676	10,015
Deferred income taxes	30,799	-4,358	-1,036
Other deferred liabilities	3,725	-2,199	-4,764
Change in long-term receivables	2,828	15,815	0
Long-term insurance prepayment	-17,411	0	0
Other, net	9,740	-3,059	-5,852
Net cash provided by operating activities	721,716	448,516	299,805
Cash Flows from Investing Activities:	'	'	'
Additions to property, equipment and improvements	-132,146	-127,270	-102,574
Disposals of property, equipment, and improvements	10,414	4,276	319
Change in cash related to consolidation of joint ventures	0	5,344	0
Purchases of investments	-25,137	-15	-38
Sales of investments	58	11	15
Sale of intellectual property	12,371	0	12,726
Acquisitions of businesses, net of cash acquired	-1,384,342	-39,429	-91,575
Net cash used for investing activities	-1,518,782	-157,083	-181,127
Cash Flows from Financing Activities:	'	'	'
Proceeds from long-term borrowings	819,681	0	528,673
Repayments of long-term borrowings	-455,426	-118,293	-98
Proceeds from short-term borrowings	207,876	59,094	2,586
Repayments of short-term borrowings	-226,091	-35,400	-579,901
Proceeds from issuances of common stock	44,704	46,079	43,568
Common stock repurchases	-78,399	0	0
Tax (deficiency) benefit from stock based compensation	-1,344	-3,213	3,956
Distributions to noncontrolling interests	-6,081	-7,974	-5,376
Contributions from noncontrolling interests	0	0	3,868
Net cash provided by (used for) financing activities	304,920	-59,707	-2,724
Effect of Exchange Rate Changes	-31,612	-7,778	10,870
Increase (Decrease) in Cash and Cash Equivalents	-523,758	223,948	126,824
Cash and Cash Equivalents at Beginning of Period	1,256,405	1,032,457	905,633
Cash and Cash Equivalents at End of Period	$732,647	$1,256,405	$1,032,457

Description_Of_Business_And_Ba

Description Of Business And Basis Of Presentation	12 Months Ended
	Sep. 26, 2014
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
	We provide a broad range of technical, professional, and construction services including engineering, design, and architectural services; construction and construction management services; operations and maintenance services; and process, scientific, and systems consulting services. We provide our services through offices and subsidiaries located primarily in North America, South America, Europe, the Middle East, India, Australia, Africa, and Asia. We provide our services under cost-reimbursable and fixed-price contracts. The percentage of revenues realized from each of these types of contracts for each of the last three fiscal years was as follows:
		2014		2013		2012
	Cost-reimbursable	83	%	85	%	85	%
	Fixed-price	17	%	15	%	15	%
	Basis of Presentation, Definition of Fiscal Year, and Other Matters
	The accompanying Consolidated Financial Statements have been prepared in accordance with U.S. GAAP and include the accounts of Jacobs Engineering Group Inc. and its subsidiaries and affiliates which it controls. All significant 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.
	Please refer to Note 16—Definitions for the definitions of certain terms used in the accompanying Consolidated Financial Statements and these Notes to Consolidated Financial Statements.

Significant_Accounting_Policie

Significant Accounting Policies	12 Months Ended
	Sep. 26, 2014
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]	'
Significant Accounting Policies	'
	Significant Accounting Policies
	Revenue Accounting for Contracts and Use of Joint Ventures
	In general, we recognize revenues at the time we provide services. Depending on the commercial terms of the contract, we recognize revenues either when costs are incurred, or using the percentage-of-completion method of accounting by relating contract costs incurred to date to the total estimated costs at completion. Contract losses are provided for in their entirety in the period they become known, without regard to the percentage-of-completion. For multiple contracts with a single customer we account for each contract separately. We also recognize as revenues costs associated with claims and unapproved change orders to the extent it is probable that such claims and change orders will result in additional contract revenue, and the amount of such additional revenue can be reliably estimated.
	Certain cost-reimbursable contracts include incentive-fee arrangements. The incentive fees in such contracts can be based on a variety of factors but the most common are the achievement of target completion dates, target costs, and/or other performance criteria. Failure to meet these targets can result in unrealized incentive fees. We recognize incentive fees based on expected results using the percentage-of-completion method of accounting. As the contract progresses and more information becomes available, the estimate of the anticipated incentive fee that will be earned is revised as necessary. We bill incentive fees based on the terms and conditions of the individual contracts. In certain situations, we are allowed to bill a portion of the incentive fees over the performance period of the contract. In other situations, we are allowed to bill incentive fees only after the target criterion has been achieved. Incentive fees which have been recognized but not billed are included in receivables in the accompanying Consolidated Balance Sheets.
	Certain cost-reimbursable contracts with government customers as well as certain commercial clients provide that contract costs are subject to audit and adjustment. In this situation, revenues are recorded at the time services are performed based upon the amounts we expect to realize upon completion of the contracts. Revenues are not recognized for non-recoverable costs. In those situations where an audit indicates that we may have billed a client for costs not allowable under the terms of the contract, we estimate the amount of such nonbillable costs and adjust our revenues accordingly.
	When we are directly responsible for subcontractor labor or third-party materials and equipment, we reflect the costs of such items in both revenues and costs (and we refer to such costs as “pass-through” costs). On those projects where the client elects to pay for such items directly and we have no associated responsibility for such items, these amounts are not reflected in either revenues or costs.
	The following table sets forth pass-through costs included in revenues for each of the last three fiscal years (in millions):
	2014				2013				2012
	$	2,954.90			$	2,624.80			$	2,328.40
	As is common to the industry, we execute certain contracts jointly with third parties through various forms of joint ventures and consortiums. Although the joint ventures own and hold the contracts with the clients, the services required by the contracts are typically performed by us and our joint venture partners, or by other subcontractors under subcontracting agreements with the joint ventures. The assets of our joint ventures, therefore, consist almost entirely of cash and receivables (representing amounts due from clients), and the liabilities of our joint ventures consist almost entirely of amounts due to the joint venture partners (for services provided by the partners to the joint ventures under their individual subcontracts) and other subcontractors. In general, at any given time, the equity of our joint ventures represents the undistributed profits earned on contracts the joint ventures hold with clients. Very few of our joint ventures have employees. None of our joint ventures have third-party debt or credit facilities. Our joint ventures, therefore, are simply mechanisms used to deliver engineering and construction services to clients. Rarely do they, in and of themselves, present any risk of loss to us or to our partners separate from those that we would carry if we were performing the contract on our own. Under U.S. GAAP, our share of losses associated with the contracts held by the joint ventures, if and when they occur, has always been reflected in our Consolidated Financial Statements.
	Certain of our joint ventures meet the definition of a VIE. In evaluating our VIEs for possible consolidation, we perform a qualitative analysis to determine whether or not we have a “controlling financial interest” in the VIE as defined by U.S. GAAP. We consolidate only those VIEs over which we have a controlling financial interest.
	For the Company’s unconsolidated joint ventures, we use either the equity method of accounting or proportional consolidation. The Company does not currently participate in any significant VIEs in which it has a controlling financial interest that it does not consolidate.
	There were no changes in facts and circumstances during the period that caused the Company to reassess the method of accounting for its VIEs.
	Fair Value Measurements
	The net carrying amounts of cash and cash equivalents, trade receivables and payables, and notes payable approximate Fair Value due to the short-term nature of these instruments. Similarly, we believe the carrying value of long-term debt also approximates Fair Value based on the interest rates and scheduled maturities applicable to the outstanding borrowings. Certain other assets and liabilities, such as forward contracts and an interest rate swap agreement we purchased as cash-flow hedges discussed in Note 10 —Commitments and Contingencies - 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 (needed for purposes of determining whether there is an indication of possible impairment of the carrying value of goodwill) is determined using a both an income approach and a market approach. Both approaches require us to make 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 the invested capital associated with the guideline companies. In assessing whether there is an indication that the carrying value of goodwill has been impaired, we utilize the results of both valuation techniques and consider the range of Fair Values indicated. The range of values (both ends of the range) for each reporting unit, exceeded the respective book values by more than 40%.
	With respect to 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 highly 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 drastically different Fair Values to be assigned to our stock option awards. For restricted stock units containing service and market conditions, compensation expense is based on the Fair Value of such units using a Monte Carlo simulation. Due to the uncertainties inherent in the use of assumptions and the results of applying Monte Carlo simulations and because equity awards tend to vest over several years and additional equity awards may be made in the future, the amount of expense recorded in the accompanying consolidated financial statements may not be representative of the effects on our future consolidated financial statements.
	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. Debt securities are valued at the last reported sale price on the last business day applicable. Real estate consists primarily of common or collective trusts, with underlying investments in real estate. They 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. Insurance contracts, investments in infrastructure/raw goods, and hedge funds are valued using actuarial assumptions and values reported by the fund managers.
	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 its 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 26, 2014 and September 27, 2013 consisted primarily of money market mutual funds and overnight bank deposits.
	Receivables and Billings in Excess of Costs
	“Receivables” include billed receivables, unbilled receivables, and retentions receivable. Billed receivables represent amounts invoiced to clients in accordance with the terms of our client contracts. They are recorded in our financial statements when they are issued. Unbilled receivables and retentions receivable represent reimbursable costs and amounts earned and reimbursable under contracts in progress as of the respective balance sheet dates. Such amounts become billable according to the contract terms, which usually consider the passage of time, achievement of certain milestones or completion of the project. We anticipate that substantially all of such unbilled amounts will be billed and collected over the next fiscal year.
	Certain contracts allow us to issue invoices to clients in advance of providing services. “Billings in excess of costs” represent billings to, and cash collected from, clients in advance of work performed. 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 4 to 10 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, we test goodwill for possible impairment. We conduct such tests annually (or more frequently if events occur or circumstances change that would more likely than not reduce the Fair Values of our reporting units below their respective carrying values). The first step in the test is to compare the Fair Value of each of the Company’s reporting units to their respective carrying amounts, including goodwill. In the event that the carrying value of a reporting unit exceeds its Fair Value, a second test is performed to measure the amount of the impairment loss, if any. In performing the annual impairment test, the Company evaluates goodwill at the reporting unit level. We have determined that our operating segment is comprised of two reporting units based on geography. Based on the results of these tests, we have determined that the Fair Value of our reporting units substantially exceeded their respective carrying values for fiscal years 2014, 2013, and 2012.
	The following table provides certain information related to the Company’s acquired intangible assets for each of the fiscal years presented (in thousands):
			Customer				Developed				Trade			Other				Total
			Relationships,				Technology				Names
			Contracts, and
			Backlog
	Balances, September 30, 2011		$	229,738			$	21,977			$	3,473		$	3,818			$	259,006
	Acquisitions		13,010				—				1,200			410				14,620
	Amortization		(24,406		)		(1,533		)		(1,430		)	(1,597		)		(28,966		)
	Foreign currency translation		(613		)		—				(161		)	(124		)		(898		)
	Balances, September 28, 2012		217,729				20,444				3,082			2,507				243,762
	Acquisitions		—				—				—			—				—
	Amortization		(20,731		)		(1,533		)		(614		)	(1,130		)		(24,008		)
	Foreign currency translation		(1,471		)		—				(289		)	(90		)		(1,850		)
	Balances, September 27, 2013		195,527				18,911				2,179			1,287				217,904
	Acquisitions		249,164				—				15,049			—				264,213
	Amortization		(37,737		)		(1,533		)		(3,251		)	(693		)		(43,214		)
	Foreign currency translation		1,087				—				171			31				1,289
	Balances, September 26, 2014		$	408,041			$	17,378			$	14,148		$	625			$	440,192
	Weighted average amortization period (years)		10.2				12				4			11.6				10.1
	The weighted average amortization period includes the effects of foreign currency translation.
	The above table excludes the values assigned to those intangible assets embedded in the Company’s investment in AWE Management Ltd. (“AWE”) and Guimar Engenharia LTDA ("Guimar"). Those amounts are included in the carrying value of the Company’s investment in AWE and Guimar. The amount of amortization expense we estimate we will record during each of the next five fiscal years relating to intangible assets existing at September 26, 2014, including those associated with AWE and Guimar, is: fiscal 2015 - $52.9 million; fiscal 2016 - $51.5 million; fiscal 2017 - $49.0 million; fiscal 2018 - $47.5 million; and fiscal 2019 - $46.7 million. The amounts reported for future amortization include the effect of exchange rate changes.
	The change in goodwill during the three year period ending September 26, 2014 was due primarily to businesses acquired during fiscal 2014.
	Business Combinations
	On December 13, 2013, the Company acquired all of the outstanding interests in Sinclair Knight Merz Management Pty Limited and Sinclair Knight Merz Holdings Limited (collectively, "SKM"), a provider of engineering, design, procurement, construction and project management services. The Company purchased SKM for approximately $1.2 billion in cash. The acquisition agreement includes customary representations, warranties, and indemnities supported by an escrow account. SKM's results of operations have been included in the Company's consolidated results of operations since the date of acquisition.
	The Company has, in total, incurred approximately $16.6 million of expenses directly related to the SKM acquisition. Included in selling, general and administrative expense for fiscal 2014 is $9.2 million of incremental, transaction-related expenses.
	The following table presents the preliminary allocation of the purchase price (in thousands) paid for SKM:
	Assets:
	Cash and cash equivalents	$	152,051
	Receivables and other current assets	367,580
	Property and equipment, and other	71,630
	Intangible assets	202,166
	Total assets	793,427
	Liabilities:
	Current liabilities	333,298
	Deferred tax liability	70,758
Long-term liabilities	20,416
Total liabilities	424,472
Net identifiable assets acquired	$	368,955
Goodwill	850,719
Net assets acquired	$	1,219,674
The Company expects to collect substantially all of the acquired receivables of $304.6 million, net of acquired allowances.
The purchase price allocation of the SKM transaction continues to be subject to post-closing adjustment as the Company finalizes the values assigned to project-related assets and liabilities, claims, other contingencies, acquired intangible assets, and leased properties, among other items. The Company intends to complete the purchase price allocation by the end of the measurement period provided by U.S. GAAP. The preliminary useful lives of the intangible assets acquired from SKM range from 3 to 12 years.
Some of the factors contributing to the recognition of goodwill include: (i) access to a large, highly-trained and stable workforce; (ii) the opportunity to expand our client base in Australia, Asia, South America and the U.K.; (iii) the opportunity to expand our presence in multiple industries, including: mining, infrastructure, buildings, water and energy; and (iv) the opportunity to achieve operating synergies. We expect that a significant portion of the the goodwill recognized in the SKM transaction will ultimately be deductible in the U.S. for federal income tax purposes.
The following table presents the unaudited, pro forma consolidated results of operations (in millions, except per share amounts) for fiscal years 2014 and 2013 as if the acquisition of SKM operations had occurred as of September 28, 2012. The period end dates of SKM are different from those of the Company and, accordingly, certain adjustments were made to conform SKM's period end dates to those of the Company. Management believes these adjustments make the comparative data more representative of what the combined results of operations would have been over the pro forma period. The pro forma results are not necessarily indicative of (i) the results of operations that would have occurred had we actually acquired SKM on September 28, 2012; or (ii) future results of operations:
	2014				2013
Revenues	$	12,944,848			$	13,064,768
Net earnings attributable to Jacobs	$	335,658			$	488,434
Basic earnings per share	$	2.57			$	3.78
Diluted earnings per share	$	2.54			$	3.73
The pro forma earnings for fiscal year 2014 were adjusted to exclude $21.4 million of transaction-related costs incurred by both parties and, for fiscal year 2013, include $21.4 million of transaction-related costs in the pro forma earnings. For fiscal years 2014 and 2013, the pro forma earnings were adjusted to reduce interest expense by $2.3 million (for a total of $2.1 million) and to include incremental interest expense of $5.4 million (for a total of $5.4 million), respectively. For fiscal years 2014 and 2013, the pro forma earnings were adjusted to include net incremental intangible amortization of $2.5 million (for a total of $19.9 million) and $16.1 million (for a total of $21.3 million), respectively. The difference in the total intangible amortization between the periods is due to the effects of exchange rate changes.
The pro forma earnings for fiscal year 2014 include an expense from SKM of $24 million related to a settlement with certain SKM shareholders regarding provisions of their shareholding plan that was settled and paid prior to the close of the business combination and recorded during the three month period ended December 27, 2013.
During fiscal year 2014, the Company also acquired Federal Network Services LLC (formerly a subsidiary of Verizon), Eagleton Engineering, LLC, FMHC Corporation, Stobbarts (Nuclear) Limited, Trompeter Enterprises, and MARMAC Field Services, Inc. The operations of these acquisitions were not material to the Company's consolidated results for fiscal 2014. During fiscal 2014, we also acquired an additional 15% interest in Zamel and Turbag Consulting Engineers Company ("ZATE"), a refining, chemicals, infrastructure and civil engineering company headquartered in Al Khobar, Saudi Arabia. This transaction brought the Company's ownership in ZATE to 75%.
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 period(s) 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 computed 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 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 Company's Consolidated Financial Statements.
The following table presents our stock-based compensation expense for the various types of awards made by the Company for each of the fiscal years presented (in thousands):
Award Type		2014		2013		2012
Restricted Stock and Restricted		$17,307		$12,836		$11,021
Stock Units (excluding Market and
Performance Awards)
Stock Options		10,829		11,385		14,067
Market and Performance Awards		15,264		15,297		7,354
Total Expense		$43,400		$39,518		$32,442
The Company has two incentive plans whereby eligible employees and directors of Jacobs may be granted stock options, restricted stock, and/or restricted stock units.
Stock Options—Substantially all of the stock options granted during the year are awarded on the same date (although the date is different for employees and directors). The following table presents the assumptions used in the Black-Scholes option-pricing model during each of the last three fiscal years for awards made to employees and directors:
		Awards Made to Employees									Awards Made to Directors
		2014			2013			2012			2014		2013			2012
Dividend yield		0	%		0	%		0	%		0	%	0	%		0	%
Expected volatility		34.25	%		38.37	%		43.28	%		35.3	%	37.65	%		41.42	%
Risk-free interest rate		1.79	%		1.11	%		0.95	%		1.76	%	0.95	%		1.11	%
Expected term of options (in years)		5.82			5.82			5.82			5.82		5.82			5.82
Performance Awards— During fiscal years 2014, 2013, and 2012, the Company granted restricted stock units containing service, performance, and market conditions. The restricted stock unit award is split equally between Relative TSR Restricted Stock Units and Net Earnings Growth Restricted Stock Units.
The number of Relative TSR Restricted Stock Units in which the employee may ultimately vest shall be equal to the Relative TSR grant multiplied by the TSR Performance Multiplier. The TSR Performance Multiplier will be determined by comparing the Company's total stockholder return to the total stockholder return of each of the companies in a specified industry peer group over the three-year period immediately following the award date. For purposes of computing total stockholder return, the beginning stock price will be the average closing stock price over the 30 calendar day period ending on the award date ("Performance Period"), and the ending stock price will be the average closing price over the 30 calendar day period ending on the last day of the performance period. Any dividend payments made over the Performance Period will be deemed re-invested on the ex-dividend data in additional shares of the related Company.
The following table presents the basis on which the Relative TSR Restricted Stock Units are determined:
Company TSR Percentile Rank		TSR Performance Multiplier
Below 30th percentile		—%
30th percentile		50%
50th percentile		100%
70th percentile or above		150%
If the Company's total stockholder return over the Performance Period falls between any of the brackets described above, the TSR Performance Multiplier will be determined using straight line interpolation based on the actual percentile ranking.
Substantially all of the TSR restricted stock units awarded during the year are awarded on the same date. The following table presents the assumptions used to value the TSR restricted stock units:
	2014		2013		2012
Dividend yield	—	%	—	%	—	%
Expected volatility	24.77	%	29.18	%	36.3
Risk-free interest rate	0.8	%	0.42	%	0.42
Expected term (in years)	3		3		3
The number of Net Earnings Growth Restricted Stock Units awarded in fiscal year 2012 in which an employee may ultimately vest shall be equal to the sum of the following: (1) an amount, not less than zero, equal to one-third of the earned Net Earnings Growth Restricted Stock Units grant multiplied by the Net Earnings Growth Performance Multiplier (or, "NEGPM", as defined) determined based upon the growth in the Company's Net Earnings (as defined) over the period from April 1, 2012 to March 31, 2013; plus, (2) an amount, not less than zero, equal to (A) two-thirds of the earned Net Earnings Growth Restricted Stock Units grant multiplied by the NEGPM determined based upon the average growth in the Company's Net Earnings over the period from April 1, 2012 to March 31, 2014, minus (B) the amount determined pursuant to (1) above; plus, (3) an amount, not less than zero, equal to (A) the earned Net Earnings Growth Restricted Stock Units grant multiplied by the NEGPM determined based upon the average growth in the Company's Net Earnings over the period from April 1, 2012 to March 31, 2015, minus (B) the amount determined pursuant to (1) and (2) above.
For Net Earnings Growth Restricted Stock Units awarded in fiscal years 2013 and 2014, all of the criteria referenced in the paragraph above are the same over the three year vesting period with the exception of the performance period. The periods for fiscal years 2013 and 2014 are based upon the Company's Net Earnings (as defined) over the period starting on the first day of the Company's third quarter of fiscal 2013 and ending on the last day of the Company's second quarter of fiscal 2016 and the Company's Net Earnings (as defined) over the period starting on the first day of the Company's third quarter of fiscal 2014 and ending on the last day of the Company's second quarter of fiscal 2017, respectively.
If the Company's average growth in Net Earnings over the applicable fiscal years during the respective performance periods is between 5% and 10%, 10% and 15%, or 15% and 20%, the Net Earnings Growth Performance Multiplier will be determined using straight line interpolation based on the actual average growth in the Company's consolidated net earnings attributable to Jacobs.
The following table presents the basis on which the Net Earnings Growth Restricted Stock Units are determined:
Average Net		Net Earnings Growth
Earnings Growth		Performance
		Multiplier
Less than 5%		—%
5%		50%
10%		100%
15%		150%
20%		200%
Unless stated otherwise, all other awards are valued based on the closing price of the Company's common stock as reported in the NYSE Composite Price History on their respective grant dates.
Concentrations of Credit Risk
Our cash balances and cash equivalents are maintained in accounts held by major banks and financial institutions located primarily 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.
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.
Earlier in these Notes to Consolidated Financial Statements we discussed three significant accounting policies that rely on the application of estimates and assumptions: revenue recognition for long-term construction contracts; the process for testing goodwill for possible impairment; and the accounting for share-based payments to employees and directors. The following is a discussion of certain other significant accounting policies that rely on the use of estimates:
Accounting for 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.
Accounting for 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 worldwide 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— 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. 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.
Accounting for 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. Determining the Fair Value of contract assets and liabilities acquired often requires estimates and judgments regarding, among other things, the estimated cost to complete such contracts. The Company must also make certain estimates and judgments relating to other assets and liabilities acquired as well as any identifiable intangible assets acquired.
New Accounting Pronouncements
In May 2014, the FASB issued ASU No. 2014-09—Revenue from Contracts with Customers. The new guidance provided by ASU 2014-09 is intended to remove inconsistencies and weaknesses in the existing revenue requirements, provide a more robust framework for addressing revenue issues, improve comparability, provide more useful information and simplify the preparation of financial statements. ASU 2014-09 is effective for annual and interim reporting periods beginning after December 15, 2016. Early adoption is not permitted. The Company is currently evaluating the impact that the new guidance may have on the consolidated financial statements.
In December 2011, the FASB adopted ASU No. 2011-11—Disclosures about Offsetting Assets and Liabilities. ASU 2011-11 amends Topic 210 of the ASC and requires entities to disclose information about offsetting and related arrangements to enable users of their financial statements to understand the effect of those arrangements on their respective financial positions. The scope of this ASU includes derivatives, sale and repurchase agreements, reverse sale and repurchase agreements, and securities borrowing and securities lending agreements. Entities are required to apply the provisions of ASU 2011-11 for annual reporting periods beginning on or after January 1, 2013. The Company does not believe that the adoption of ASU 2011-11 will have a material effect on its consolidated financial statements.

Stock_Purchase_And_Stock_Optio

Stock Purchase And Stock Option Plans	12 Months Ended
	Sep. 26, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Stock Purchase And Stock Option Plans	'
	Stock Purchase and Stock Option Plans
	Broad-Based, Employee Stock Purchase Plans
	Under the 1989 ESPP and the GESPP, 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 1989 ESPP and the GESPP during each of the last three fiscal years:
			2014				2013				2012
	Aggregate Purchase Price Paid for Shares Sold:
	Under the 1989 ESPP		$	30,354,723			$	30,012,848			$	32,236,660
	Under the GESPP		3,314,046				3,068,578				2,944,987
	Total		$	33,668,769			$	33,081,426			$	35,181,647
	Aggregate Number of Shares Sold:
	Under the 1989 ESPP		553,201				642,675				853,819
	Under the GESPP		59,883				64,963				76,360
	Total		613,084				707,638				930,179
	At September 26, 2014, there remains 1,860,820 shares reserved for issuance under the 1989 ESPP and 212,185 shares reserved for issuance under the GESPP.
	Stock Incentive Plans
	We also sponsor the 1999 SIP and the 1999 ODSP. The 1999 SIP provides for the issuance of incentive stock options, nonqualified stock options, share appreciation rights ("SAR"), restricted stock, and restricted stock units to employees. The 1999 ODSP provides for awards of shares of common stock, restricted stock, and restricted stock units, and grants of nonqualified stock options to our outside (i.e., nonemployee) directors. The following table sets forth certain information about the 1999 Plans:
			1999 SIP			1999 ODSP			Total
	Number of shares authorized		29,850,000			800,000			30,650,000
	Number of remaining shares reserved for issuance at September 26, 2014		11,072,944			357,000			11,429,944
	Number of shares relating to outstanding stock options at September 26, 2014		3,954,272			266,875			4,221,147
	Number of shares available for future awards:
	At September 26, 2014		7,118,672			90,125			7,208,797
	At September 27, 2013		5,099,632			140,125			5,239,757
	Effective September 28, 2012, all grants of shares under the 1999 SIP are issued on a fungible share basis. An award of an option or SAR counts as 1.00 share issued under the 1999 SIP Plan. A grant other than an option or SAR counts as 1.92 shares issued under the 1999 SIP Plan.
	The following table presents the Fair Value of shares (of restricted stock and restricted stock units) vested during each of the last three fiscal years (in thousands):
			2014				2013				2012
	Restricted Stock and Restricted Stock Units (service condition)		$	6,820			$	13,054			$	7,955
	Restricted Stock Units (service, market, and performance conditions at target)		18,675				—				—
	Total		$	25,495			$	13,054			$	7,955
	The following table presents the Company’s total pre-tax compensation cost relating to share-based payments included in the accompanying Consolidated Statements of Earnings (in thousands):
	2014				2013				2012
	$	43,400			$	39,518			$	32,442
	At September 26, 2014, the amount of compensation cost relating to nonvested awards not yet recognized in the financial statements is approximately $146.0 million. The majority of the unrecognized compensation costs will be recognized by the first quarter of fiscal 2018. The weighted average remaining contractual term of options currently exercisable is 4.6 years.
	Stock Options
	The following table summarizes the stock option activity for each of the last three fiscal years:
			Number of			Weighted
			Stock			Average
			Options			Exercise
						Price
	Outstanding at September 30, 2011		6,461,510			$	43.28
	Granted		658,700			$	37.45
	Exercised		(1,281,449	)		$	22.54
	Cancelled or expired		(82,027	)		$	43.92
	Outstanding at September 28, 2012		5,756,734			$	47.23
	Granted		753,450			$	54.71
	Exercised		(1,782,371	)		$	37
	Cancelled or expired		(121,601	)		$	50.22
	Outstanding at September 27, 2013		4,606,212			$	52.33
	Granted		602,525			$	53.51
	Exercised		(718,065	)		$	47.18
	Cancelled or expired		(269,525	)		$	54.46
	Outstanding at September 26, 2014		4,221,147			$	53.23
	Stock options outstanding at September 26, 2014 consisted entirely of nonqualified stock options. The following table presents the total intrinsic value of stock options exercised during each of the last three fiscal years (in thousands):
	2014				2013				2012
	$	9,590			$	22,163			$	26,196
	The total intrinsic value of stock options exercisable at September 26, 2014, was approximately $30.5 million. The following table presents certain other information regarding our 1999 Plans:
			2014				2013				2012
	At fiscal year end:
	Range of exercise prices for options outstanding		$25.87–$94.11				$20.98–$94.11				$18.49–$94.11
	Number of options exercisable		2,725,980				3,034,111				4,219,557
	For the fiscal year:
	Range of prices relating to options exercised		$20.98–$57.54				$18.49–$56.95				$13.29–$37.73
	Estimated weighted average Fair Values of options granted		$	19.04			$	20.64			$	15.55
	The following table presents certain information regarding stock options outstanding, and stock options exercisable at September 26, 2014:
		Options Outstanding									Options Exercisable
Range of Exercise Prices		Number			Weighted		Weighted				Number	Weighted
					Average		Average					Average
					Remaining		Price					Exercise
					Contractual							Price
					Life
					(years)
$25.87 - $26.80		21,500			0.44		$	26.73			21,500	$	26.73
$32.51 - $37.32		531,375			7.55		37.01				269,625	37
$37.43 - $46.37		1,460,412			5.44		42.39				1,363,037	42.3
$47.11 - $55.04		1,453,911			8.53		52.99				397,644	51.02
$55.13 - $57.81		17,000			5.04		56.51				10,250	57.27
$60.08 - $83.61		165,075			5.31		70.4				92,050	78.42
$88.19 - $94.11		571,874			0.64		92.57				571,874	92.57
		4,221,147			6.09		$	53.23			2,725,980	$	—
The 1999 Plans 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 so tendered are retired and canceled, and are shown as repurchases of common stock in the accompanying Consolidated Statements of Stockholders’ Equity.
The following table presents the number of shares of restricted stock and restricted stock units issued under the 1999 SIP during each of the last three fiscal years:
		2014(1)			2013(1)			2012
Restricted stock		589,150			445,200			497,100
Restricted stock units (service condition)		287,545			107,500			116,450
Restricted stock units (service, market, and performance conditions at target)		432,700			471,250			525,000
The amount of restricted stock units issued for awards with performance and market conditions in the above table are based on 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 described in Note 2 – Significant Accounting Policies.
The following table presents the number of shares of restricted stock and restricted stock units cancelled and withheld for taxes under the 1999 SIP during each of the last three fiscal years:
		2014(1)(2)			2013(1)(2)			2012
Restricted stock		147,221			128,923			80,460
Restricted stock units (service condition)		12,333			3,385			5,650
Restricted stock units (service, market, and performance conditions at target)		52,000			32,000			22,000
The amount of restricted stock units cancelled for awards with market and performance conditions in the above table is based on the target amount.
(1) The share amounts in the above tables for fiscal 2013 and 2014 reflect the fungible share counting of 1.92 shares for each share of restricted stock and restricted stock unit issued.
(2) Commencing in fiscal 2013, shares withheld for withholding tax liabilities are available for awards under the 1999 SIP and have been included in the table above for fiscal 2013 and 2014 only.
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 shares of restricted stock and restricted stock units outstanding at September 26, 2014 under the 1999 SIP. Shares granted prior to September 29, 2012 were granted on a 1-to-1 basis ("Not Fungible"). Shares Granted after September 28, 2012 were issued on a 1.92-to-1.00 basis ("Fungible"):
		Not Fungible			Fungible			Total
Restricted stock		929,990			985,400			1,915,390
Restricted stock units (service condition)		103,920			384,995			488,915
Restricted stock units (service, market, and performance conditions at target)		475,000			871,950			1,346,950
The following table presents the number of shares of restricted stock and restricted stock units issued under the 1999 ODSP during each of the last three fiscal years:
		2014			2013			2012
Restricted stock units (service condition)		15,000			13,500			8,000
The following table provides the number of shares of restricted stock and restricted stock units outstanding at September 26, 2014 under the 1999 ODSP (all shares granted under the 1999 ODSP are issued on a 1-to-1 basis):
		2014
Restricted stock		40,000
Restricted stock units (service condition)		62,500
All shares granted under the 1999 ODSP are issued on a 1-to-1 basis.

Earnings_Per_Share

Earnings Per Share	12 Months Ended
	Sep. 26, 2014
Earnings Per Share Reconciliation [Abstract]	'
Earnings Per Share	'
	Earnings Per Share
	Basic and Diluted Earnings Per Share
	The following table (i) reconciles the denominator used to compute Basic EPS to the denominator used to compute Diluted EPS for each of the last three fiscal years, and (ii) discloses the number of antidilutive stock options, shares of restricted stock, and restricted stock units outstanding at the end of each of the fiscal years indicated (in thousands):
			2014	2013		2012
	Shares used to calculate EPS:
	Weighted average shares outstanding		130,483	129,288		127,644
	(denominator used to compute basic EPS)
	Effect of stock options and restricted stock		1,888	1,657		1,048
	Denominator used to compute diluted EPS		132,371	130,945		128,692
	Antidilutive stock options, shares of restricted stock, and restricted stock units		2,074	2,603		5,093
	Share Repurchases
	On August 19, 2014, the Company's Board of Directors authorized a new share repurchase program of up to $500 million of the Company's common stock. The following table summarizes the activity under this program during fiscal 2014 (in thousands, except per-share amounts):
		Amount Authorized		Average Price Per Share (1)			Total Shares Retired	Shares Repurchased
		(in thousands)						2014
		$	500,000	$	52.27		1,500	1,500
	-1	Includes commissions paid and calculated as the average price per share since the repurchase
	program authorization date.
	Share repurchases may be executed through various means including, without limitation, open market transactions, privately negotiated transactions or otherwise. The share repurchase program does not obligate the Company to purchase any shares, and expires on August 19, 2017. The authorization for the share repurchase program may be terminated, increased or decreased by the Company’s Board of Directors in its discretion at any time.

Borrowings

Borrowings	12 Months Ended
	Sep. 26, 2014
Debt Disclosure [Abstract]	'
Borrowings	'
	Borrowings
	Short-Term Credit Arrangements
	The Company maintains both committed and uncommitted credit arrangements with several banks providing for short-term borrowing capacity and overdraft protection. There were overdrafts of $36.7 million outstanding under these short-term credit facilities at a weighted average interest rate of 6.4% at September 26, 2014, and there were overdrafts of $22.8 million outstanding under these short-term credit facilities at September 27, 2013.
	Long-term Debt
	On February 7, 2014, Jacobs and certain of its subsidiaries entered into a $1.6 billion long-term unsecured, revolving credit facility (the "2014 Facility") with a syndicate of large, U.S. and international banks and financial institutions. The 2014 Facility replaced and refinanced the Company's previous $1.21 billion unsecured revolving credit facility originally entered into by the Company on March 29, 2012 (the "2012 Facility"). On the closing date of the 2014 Facility, all amounts outstanding and committed under the 2012 Facility were effectively terminated and refinanced under the 2014 Facility. The 2014 Facility also provides an accordion feature that allows the Company and the lenders to increase the facility amount to $2.1 billion. The 2014 Facility did not change interest rates for borrowings outstanding under the 2012 Facility, but did reduce the fees on the unused portion of the facility.
	The following table presents certain information regarding the Company’s long-term revolving credit facilities at September 26, 2014, and September 27, 2013 (dollars in thousands):
	2014						2013
	Principal				Range		Principal				Range
	Balance				of Interest		Balance				of Interest
	Outstanding				Rates		Outstanding				Rates
	$	764,075			1.0% – 1.51%		$	415,086			0.96% – 1.37%
	The total amount outstanding under the 2014 Facility in the form of direct borrowings at September 26, 2014 was $0.8 billion. The Company has issued $2.8 million in letters of credit leaving $0.8 billion of available borrowing capacity under the 2014 Facility at September 26, 2014. In addition, the Company had $312.6 million issued under separate, committed and uncommitted letter-of-credit facilities for total issued letters of credit of $315.4 million at September 26, 2014.
	The 2014 Facility expires in February 2019 and permits the Company to borrow under two separate tranches in U.S. dollars, certain specified foreign currencies, and any other currency that may be approved in accordance with the terms of the 2014 Facility. Depending on the Company's Consolidated Leverage Ratio, borrowings under the 2014 Facility will bear interest at either a eurocurrency rate plus a margin of between 1.0% and 1.5% or a base rate plus a margin of between 0% and 0.5%. The 2014 Facility also provides for a financial letter of credit subfacility of $300.0 million, permits performance letters of credit, and provides for a $50.0 million subfacility for swingline loans. Letters of credit are subject to fees based on the Company's Consolidated Leverage Ratio at the time any such letter of credit is issued. The Company pays a facility fee of between 0.100% and 0.25% per annum depending on the Company's Consolidated Leverage Ratio. Amounts outstanding under the 2014 Facility may be prepaid at the option of the Company without premium or penalty, subject to customary breakage fees in connection with the prepayment of eurocurrency loans. The 2014 Facility contains affirmative, negative, and financial covenants customary for financings of this type including, among other things, limitations on certain other indebtedness, loans and investments, liens, mergers, asset sales and transactions with affiliates. In addition, the 2014 Facility contains customary events of default. We were in compliance with our debt covenants at September 26, 2014.
	The following table presents certain additional information regarding the Company’s 2014 and 2012 Facilities for the fiscal years shown:
			2014				2013
	Maximum amount outstanding at any month-end during the fiscal year		$	1,036,066			$	526,602
	Average amount outstanding during the year		$	866,264			$	470,343
	Weighted average interest rate during the year		1.18		%		1.11		%
	The following table presents the amount of interest paid by the Company during each of the last three fiscal years (in thousands):
	2014				2013				2012
	$	13,841			$	6,685			$	8,572

Pension_Plans

Pension Plans	12 Months Ended
	Sep. 26, 2014
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]	'
Pension and Other Postretirement Benefit Plans	'
	Pension and Other Postretirement Benefit Plans
	Company-Only Sponsored Plans
	We sponsor various defined benefit pension 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 is to fund the actuarially determined accrued benefits where applicable, allowing for projected compensation increases using the projected unit method.
	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, amongst others.  The discount rates used in valuing the plans' benefit obligations were determined with reference to high quality corporate/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.) during each of the fiscal years presented (in thousands):
			U.S. Pension Plans								Non-U.S. Pension Plans
			2014				2013				2014			2013
	Net benefit obligation at the		$	468,439			$	509,605			$	1,307,331		$	1,191,345
	beginning of the year
	Service cost		12,077				13,814				25,374			30,117
	Interest cost		22,041				18,569				54,208			51,331
	Participants’ contributions		3,095				3,071				9,082			11,805
	Actuarial (gains)/losses		27,076				(42,689		)		105,838			57,764
	Benefits paid		(35,634		)		(33,960		)		(33,387		)	(34,058		)
	Curtailments and settlements		—				—				(269,580		)	(6,297		)
	Plan amendments		(1,306		)		—				—			109
	Special termination benefits		—				29				—			—
	Effect of exchange rate changes		—				—				(2,346		)	5,215
	Net benefit obligation at the end		$	495,788			$	468,439			$	1,196,520		$	1,307,331
	of the year
	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.) during each of the fiscal years presented (in thousands):
			U.S. Pension Plans								Non-U.S. Pension Plans
			2014				2013				2014			2013
	Fair Value of plan assets at the		$	390,777			$	359,348			$	982,479		$	877,950
	beginning of the year
	Actual return on plan assets		45,484				53,495				130,665			72,368
	Employer contributions		11,628				8,823				57,977			53,885
	Participants’ contributions		3,095				3,071				9,082			11,805
	Gross benefits paid		(35,634		)		(33,960		)		(33,387		)	(34,058		)
	Business combinations/consolidations		—				—				—			—
	Curtailments/settlements		—				—				(268,486		)	(4,973		)
	Effect of exchange rate changes		—				—				(2,159		)	5,502
	Fair Value of plan assets at the		$	415,350			$	390,777			$	876,171		$	982,479
	end of the year
	The following table reconciles the combined funded statuses of the plans recognized in the accompanying Consolidated Balance Sheets at September 26, 2014, and September 27, 2013 (segregated between plans existing within and outside the U.S.) (in thousands):
			U.S. Pension Plans								Non-U.S. Pension Plans
			2014				2013				2014			2013
	Net benefit obligation at the end		$	495,788			$	468,439			$	1,196,520		$	1,307,331
	of the year
	Fair Value of plan assets at the end		415,350				390,777				876,171			982,479
	of the year
	Under-funded amount recognized		$	80,438			$	77,662			$	320,349		$	324,852
	at the end of the year
	The following table presents the accumulated benefit obligation at September 26, 2014, and September 27, 2013 (segregated between plans existing within and outside the U.S.) (in thousands):
			U.S. Pension Plans								Non-U.S. Pension Plans
			2014				2013				2014			2013
	Accumulated benefit obligation at the		$	455,245			$	431,726			$	1,128,715		$	1,222,234
	end of the year
	The following table presents the amounts recognized in the accompanying Consolidated Balance Sheets at September 26, 2014, and September 27, 2013 (segregated between plans existing within and outside the U.S.) (in thousands):
			U.S. Pension Plans								Non-U.S. Pension Plans
			2014				2013				2014			2013
	Prepaid benefit cost included in		$	—			$	—			$	7,123		$	15,193
	prepaid assets
	Accrued benefit cost included in		—				—				1,447			1,000
	current liabilities
	Accrued benefit cost included in		80,438				77,662				326,025			339,045
	noncurrent liabilities
	Net amount recognized at the end of		$	80,438			$	77,662			$	320,349		$	324,852
	the year
	Included in the tables are amounts relating to a U.S. pension plan, the participating employees in which are assigned to, and work exclusively on, a specific operating contract with the U.S. federal government. It is the intention of the parties to this contract that the cost of this pension plan will be fully reimbursed by the U.S. federal government pursuant to applicable cost accounting standards. Accordingly, included in “Other Noncurrent Assets” in the accompanying Consolidated Balance Sheet at September 26, 2014 is a receivable from the U.S. federal government of approximately $61.1 million ($58.4 million at September 27, 2013) representing the underfunded amount for this pension plan.
	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 each fiscal year presented:
			2014			2013			2012
	Weighted average discount rates		3.9% to 4.4%			4.4% to 5.0%			3.4% to 3.9%
Rates of compensation increases		2.95	%		2.8	%		3.25	%
Expected long-term rates of return		7.7	%		7.7	%		7.5	%
on plan assets
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. pension plans for each fiscal year presented:
		2014		2013		2012
Weighted average discount rates		1.8% to 8.8%		0.4% to 9.3%		0.6% to 8.4%
Rates of compensation increases		2.6% to 7.5%		2.5% to 7.5%		2.8% to 7.5%
Expected long-term rates of return		4.5% to 8.5%		0.4% to 8.5%		2.4% to 8.5%
on plan assets
The following table presents certain amounts relating to our U.S. pension plans recognized in accumulated other comprehensive loss at September 26, 2014, September 27, 2013 and September 28, 2012(in thousands):
		2014				2013				2012
Arising during the period:
Net actuarial (gain) loss		$	1,378			$	(15,850	)		$	2,756
Reclassification adjustments:
Net actuarial gain		(2,255		)		(2,674		)		(2,011		)
Total		$	(877	)		$	(18,524	)		$	745
The following table presents certain amounts relating to our Non-U.S. pension plans recognized in accumulated other comprehensive loss at September 26, 2014, September 27, 2013 and September 28, 2012 (in thousands):
		2014				2013				2012
Arising during the period:
Net actuarial loss (gain)		$	48,752			$	27,417			$	83,298
Prior service cost (benefit)		(1		)		297				(1,947		)
Total		48,751				27,714				81,351
Reclassification adjustments:
Net actuarial gain		(12,914		)		(9,778		)		(6,131		)
Prior service cost (benefit)		(19		)		41				(23		)
Total		(12,933		)		(9,737		)		(6,154		)
Total		$	35,818			$	17,977			$	75,197
The following table presents certain amounts relating to our pension plans recorded in accumulated other comprehensive loss that have not yet been recognized as components of net periodic benefit cost at September 26, 2014, and September 27, 2013 (segregated between plans existing within and outside the U.S.) (in thousands):
		U.S. Pension Plans								Non-U.S. Pension Plans
		2014				2013				2014			2013
Net actuarial loss		$	49,569			$	50,446			$	263,913		$	228,074
Prior service cost		—				—				(487		)	(466		)
Total		$	49,569			$	50,446			$	263,426		$	227,608
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 2015 based on 2014 exchange rates (segregated between plans existing within and outside the U.S.) (in thousands):
		U.S.				Non-U.S.
		Pension				Pension
		Plans				Plans
Unrecognized net actuarial loss		$	3,756			$	18,505
Unrecognized prior service cost		(239		)		(99		)
Accumulated comprehensive loss to be recorded against earnings		$	3,517			$	18,406
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 26, 2014, and September 27, 2013 (the measurement dates used in valuing the plans’ assets and liabilities) were as follows:
		U.S. Pension Plans						Non-U.S. Pension Plans
		2014			2013			2014			2013
Equity securities		75	%		74	%		29	%		32	%
Debt securities		21	%		20	%		32	%		31	%
Real estate investments		—	%		1	%		7	%		6	%
Other		4	%		5	%		32	%		31	%
The following table presents the Fair Value of the Company’s Domestic U.S. plan assets at September 26, 2014, segregated by level of Fair Value measurement inputs within the Fair Value hierarchy promulgated by U.S. GAAP (in thousands):
		Fair Values By Level of
		Fair Value Measurement Inputs
		Level 1				Level 3				Total
Domestic equities		$	268,674			$	—			$	268,674
Overseas equities		40,587				—				40,587
Domestic bonds		85,853				—				85,853
Cash and equivalents		3,932				—				3,932
Real estate		—				—				—
Hedge funds		—				16,304				16,304
Total		$	399,046			$	16,304			$	415,350
The following table presents the Fair Value of the Company’s Non-U.S. pension plan assets at September 26, 2014, segregated by level of Fair Value measurement inputs within the Fair Value hierarchy promulgated by U.S. GAAP (in thousands):
		Fair Values By Level of
		Fair Value Measurement Inputs
		Level 1				Level 3				Total
Domestic equities		$	33,842			$	—			$	33,842
Overseas equities		218,779				—				218,779
Domestic bonds		198,344				—				198,344
Overseas bonds		76,349				—				76,349
Cash and equivalents		37,487				—				37,487
Real estate		—				59,966				59,966
Insurance contracts		—				37,468				37,468
Hedge funds		—				213,936				213,936
Total		$	564,801			$	311,370			$	876,171
The following table presents the Fair Value of the Company’s U.S. pension plan assets at September 27, 2013, segregated by level of Fair Value measurement inputs within the Fair Value hierarchy promulgated by U.S. GAAP (in thousands):
		Fair Values By Level of
		Fair Value Measurement Inputs
		Level 1				Level 3				Total
Domestic equities		$	247,155			$	—			$	247,155
Overseas equities		40,719				—				40,719
Domestic bonds		79,482				—				79,482
Cash and equivalents		3,499				—				3,499
Real estate		—				4,411				4,411
Hedge funds		—				15,511				15,511
Total		$	370,855			$	19,922			$	390,777
The following table presents the Fair Value of the Company’s Non-U.S. pension plan assets at September 27, 2013, segregated by level of Fair Value measurement inputs within the Fair Value hierarchy promulgated by U.S. GAAP (in thousands):
		Fair Values By Level of
		Fair Value Measurement Inputs
		Level 1				Level 3				Total
Domestic equities		$	108,261			$	—			$	108,261
Overseas equities		207,607				—				207,607
Domestic bonds		230,202				—				230,202
Overseas bonds		76,372				—				76,372
Cash and equivalents		28,185				—				28,185
Infrastructure / raw Goods		—				7,076				7,076
Real estate		—				57,173				57,173
Insurance contracts		—				21,214				21,214
Hedge funds		—				246,389				246,389
Total		$	650,627			$	331,852			$	982,479
At September 26, 2014 and September 27, 2013, the Company holds no assets in the U.S. or Non-U.S. pension plans that use Level 2 fair value measurement inputs.
The following table summarizes the changes in the Fair Value of the Company’s U.S. Pension Plans’ Level 3 assets for the year ended September 26, 2014 (in thousands):
		Real				Hedge
		Estate				Funds
Balance, beginning of year		$	4,411			$	15,511
Sale		(4,411		)		—
Realized and unrealized gains (losses)		—				793
Balance, end of year		$	—			$	16,304
The following table summarizes the changes in the Fair Value of the Company’s Non-U.S. Pension Plans’ Level 3 assets for the year ended September 26, 2014 (in thousands):
		Infrastructure				Real				Insurance			Hedge
		/ Raw Goods				Estate				Contracts			Funds
Balance, beginning of year		$	7,076			$	57,173			$	21,214		$	246,389
Purchases, sales, and settlements		(8,125		)		(6,022		)		975			4,915
Realized and unrealized gains		1,025				8,341				926			(41,096		)
Transfers		—				—				15,756			—
Effect of exchange rate changes		24				474				(1,403		)	3,728
Balance, end of year		$	—			$	59,966			$	37,468		$	213,936
The following table summarizes the changes in the Fair Value of the Company’s U.S. Pension Plans’ Level 3 assets for the year ended September 27, 2013 (in thousands):
		Real				Hedge
		Estate				Funds
Balance, beginning of year		$	4,841			$	14,471
Transfers		—				—
Realized and unrealized losses		(430		)		1,040
Balance, end of year		$	4,411			$	15,511
The following table summarizes the changes in the Fair Value of the Company’s Non-U.S. Pension Plans’ Level 3 assets for the year ended September 27, 2013 (in thousands):
		Infrastructure				Real				Insurance			Hedge
		/ Raw Goods				Estate				Contracts			Funds
Balance, beginning of year		$	6,111			$	49,537			$	18,291		$	93,400
Purchases, sales, and settlements		—				—				1,646			144,441
Realized and unrealized gains		678				7,670				1,058			4,664
Transfers		—				—				—			—
Effect of exchange rate changes		287				(34		)		219			3,884
Balance, end of year		$	7,076			$	57,173			$	21,214		$	246,389
The following table presents the amount of cash contributions we anticipate making into the plans during fiscal 2015 (in thousands):
U.S.				Non-U.S.
Pension Plans				Pension  Plans
$	4,000			$	38,079
The following table presents the total benefit payments expected to be paid to pension plan participants during each of the next five fiscal years, and in total for the five years thereafter (in thousands):
		U.S. Pension Plans				Non-U.S.
						Pension  Plans
2015		$	38,355			$	34,024
2016		40,911				33,485
2017		43,283				35,170
2018		40,881				37,757
2019		40,955				38,445
For the period 2020 through 2024		208,013				242,260
The following table presents the components of net periodic benefit cost for the Company’s U.S. pension plans recognized in the accompanying Consolidated Statements of Earnings for each of the last three fiscal years (in thousands):
		2014				2013				2012
Service cost		$	12,077			$	13,814			$	12,838
Interest cost		22,041				18,569				20,923
Expected return on plan assets		(28,495		)		(25,826		)		(23,764		)
Actuarial loss		3,608				8,030				10,981
Prior service cost		(103		)		(103		)		(103		)
Net pension cost, before special items		9,128				14,484				20,875
Special termination benefits		—				29				—
Settlement loss		—				—				6,035
Total net periodic pension cost recognized		$	9,128			$	14,513			$	26,910
The following table presents the components of net periodic benefit cost for the Company’s Non-U.S. pension plans recognized in the accompanying Consolidated Statements of Earnings for each of the last three fiscal years (in thousands):
		2014				2013				2012
Service cost		$	25,374			$	30,117			$	22,723
Interest cost		54,208				51,331				54,287
Expected return on plan assets		(56,394		)		(54,817		)		(50,996		)
Actuarial loss		15,993				13,276				8,227
Prior service cost		(28		)		(43		)		152
Net pension cost, before special		39,153				39,864				34,393
items
Curtailments and settlements		(15,894		)		(383		)		1,326
Total net periodic pension cost		$	23,259			$	39,481			$	35,719
recognized
Multiemployer Plans
In Canada and the U.S., we contribute to various trusteed pension plans covering hourly construction employees under industry-wide agreements. We also contribute to various trusteed plans in Australia and certain countries in Europe covering both hourly and certain salaried employees. 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.
The majority of the contributions the Company makes to multiemployer pension plans is outside the U.S. 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 during each of the last three fiscal years (in thousands):
		2014				2013				2012
Canada		$	56,341			$	72,660			$	72,053
Europe and Australia		12,693				12,930				10,808
United States		4,485				4,366				4,420
Total		$	73,519			$	89,956			$	87,281

Other_Comprehensive_Income

Other Comprehensive Income	12 Months Ended
	Sep. 26, 2014
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax [Abstract]	'
Other Comprehensive Income	'
	Other Comprehensive Income
	The following table presents amounts reclassified from changes in pension liabilities in other comprehensive income to direct cost of contracts and selling, general and administrative expenses in the Company's Consolidated Statements of Earnings for the periods presented related to the Company's defined benefit pension plans (in thousands):
		2014			2013			2012
	Amortization of Defined Benefit Items:
	Actuarial losses	$	(19,601	)	$	(17,554	)	$	(11,444	)
	Prior service benefit (cost)	28			43			(152		)
	Total Before Income Tax	(19,573		)	(17,511		)	(11,596		)
	Income Tax Benefit	4,385			5,859			3,955
	Total reclassifications after-tax	$	(15,188	)	$	(11,652	)	$	(7,641	)

Savings_And_Deferred_Compensat

Savings And Deferred Compensation Plans	12 Months Ended
	Sep. 26, 2014
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. IRC. 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 during each of the last three fiscal years (in thousands):
	2014		2013		2012
	$	88,951	$	74,686	$	70,211
	Deferred Compensation Plans
	Our Executive Security Plan and Executive Deferral Plans are nonqualified deferred compensation programs that provide benefits payable to directors, officers, and certain key employees or their designated beneficiaries at specified future dates, upon retirement, or death. Benefit payments under both plans are funded by a combination of contributions from participants and the Company, and most of the participants are covered by life insurance policies with the Company designated as the beneficiary. The following table presents the amount charged to expense for the Company’s deferred compensation plans during each of the last three fiscal years (in thousands):
	2014		2013		2012
	$	5,321	$	4,470	$	4,349

Income_Taxes

Income Taxes	12 Months Ended
	Sep. 26, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Income Taxes
	The following table presents the components of our consolidated income tax expense for each of the last three fiscal years (in thousands):
			2014				2013				2012
	Current income tax expense:
	Federal		$	102,450			$	121,302			$	111,035
	State		18,698				23,246				23,303
	Foreign		38,107				74,107				69,080
	Total current tax expense		159,255				218,655				203,418
	Deferred income tax expense (benefit):
	Federal		7,561				(4,718		)		(2,505		)
	State		2,789				(582		)		(1,985		)
	Foreign		20,449				8,011				3,454
	Total deferred income tax		30,799				2,711				(1,036		)
	expense (benefit)
	Consolidated income tax expense		$	190,054			$	221,366			$	202,382
	Deferred taxes reflect the tax effects of the 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 assets at September 26, 2014, and September 27, 2013 (in thousands):
			2014				2013
	Deferred tax assets:
	Obligations relating to:
	Defined benefit pension plans		$	67,822			$	97,349
	Other employee benefit plans		215,863				198,869
	Net operating losses		64,063				41,836
	Self-insurance programs		4,672				1,758
	Contract revenues and costs		39,734				19,468
	Other		3,039				6,564
	Valuation allowance		(54,651		)		(37,300		)
	Gross deferred tax assets		340,542				328,544
	Deferred tax liabilities:
	Depreciation and amortization		(193,726		)		(127,974		)
	Residual US tax on unremitted non-US		—				(6,724		)
	earnings
	Other, net		(1,372		)		(7,560		)
	Gross deferred tax liabilities		(195,098		)		(142,258		)
	Net deferred tax assets		$	145,444			$	186,286
	A valuation allowance is recorded to reduce deferred tax assets to the amount that is more likely than not to be realized. The valuation allowance at September 26, 2014 and September 27, 2013 was $54.7 million and $37.3 million, respectively.
	Net operating loss carry forwards of foreign subsidiaries at September 26, 2014 and September 27, 2013 totaled $205.8 million and $136.1 million, respectively. If unused, foreign net operating losses of $88.0 million will expire between 2017 and 2034. Net operating losses of $117.8 million can be carried forward indefinitely.
	The following table presents the income tax benefits realized from the exercise of nonqualified stock options and disqualifying dispositions of stock sold under our employee stock purchase plans during each of the last three fiscal years (in millions):
	2014				2013				2012
	$	3.4			$	7.3			$	9.3
	The following table reconciles total income tax expense using the statutory U.S. federal income tax rate to the consolidated income tax expense shown in the accompanying Consolidated Statements of Earnings for each of the last three fiscal years (dollars in thousands):
			2014				2013				2012
	Statutory amount		$	189,758			$	231,542			$	207,668
	State taxes, net of the federal		12,750				14,892				13,538
	benefit
	Tax differential on foreign		(8,811		)		(20,253		)		(16,944		)
	earnings
	Uncertain tax positions		(9,847		)		1,553				277
	Other, net		6,204				(6,368		)		(2,157		)
	Consolidated income tax expense		$	190,054			$	221,366			$	202,382
	Rates used to compute statutory		35		%		35		%		35		%
	amount
	Consolidated effective income		35.1		%		33.5		%		34.1		%
	tax rate
	The Company’s consolidated effective income tax rate was 35.1% for fiscal 2014, compared to 33.5% in fiscal 2013. Contributing to the increase as compared to the prior year's periods were the effects of the fiscal 2014 restructuring efforts. Also contributing to the higher effective tax rate were certain non-deductible, acquisition-related costs and expenses related to the SKM acquisition.
	The following table presents income tax payments made during each of the last three fiscal years (in millions):
	2014				2013				2012
	$	173.6			$	235.8			$	191.4
	The following table presents the components of our consolidated earnings before taxes for each of the last three fiscal years (in thousands):
			2014				2013				2012
	United States earnings		$	288,800			$	352,404			$	286,987
	Foreign earnings		253,366				309,144				306,349
			$	542,166			$	661,548			$	593,336
	United States income taxes, net of applicable credits, have been provided on the undistributed earnings of the Company’s foreign subsidiaries, except in those instances where the earnings have been permanently reinvested. At September 26, 2014, approximately $26.1 million of such undistributed earnings of certain foreign subsidiaries have been permanently reinvested. Should these earnings be repatriated, approximately $7.3 million of income taxes would be payable.
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 (i.e., not as part of income tax expense). The Company’s liability for gross unrecognized tax benefits was $41.9 million and $51.8 million at September 26, 2014 and September 27, 2013, respectively, all of which, if recognized, would affect the Company’s consolidated effective income tax rate. The Company had $39.2 million and $44.8 million in accrued interest and penalties at September 26, 2014, and September 27, 2013, respectively. The Company estimates that, within 12 months, $3.5 million of gross, primarily non-U.S. unrecognized tax benefits will reverse due to the anticipated expiration of time to assess tax. As of September 26, 2014, the Company’s U.S. federal income tax returns for tax years 2011 through 2014 remain subject to examination.
The following table presents the reconciliation of the beginning and ending amount of unrecognized tax benefits for the years presented (in thousands):
		2014				2013				2012
Balance, beginning of year		$	51,770			$	53,637			$	31,130
Additions based on tax positions related to the current year		6,528				5,447				6,110
Additions for tax positions of prior years		—				—				21,438
Reductions for tax positions of prior years		(16,375		)		(6,354		)		(4,441		)
Settlement		—				(960		)		(600		)
Balance, end of year		$	41,923			$	51,770			$	53,637

Commitments_And_Contingencies_

Commitments And Contingencies, And Derivative Financial Instruments	12 Months Ended
	Sep. 26, 2014
Commitments And Contingencies, And Derivative Financial Instruments [Abstract]	'
Commitments and Contingencies, and Derivative Financial Instruments	'
	Commitments and Contingencies, and Derivative Financial Instruments
	Commitments Under Operating Leases
	We lease certain of our facilities and equipment under operating leases with net aggregate future lease payments of approximately $1.1 billion at September 26, 2014, payable as follows (in thousands):
	In fiscal years,
	2015	$	230,866
	2016	175,877
	2017	153,295
	2018	129,530
	2019	96,865
	Thereafter	308,890
		1,095,323
	Amounts representing sublease income	(19,259		)
	Total, net aggregate future lease payments	$	1,076,064
	We recognize rent expense, inclusive of landlord concessions and tenant allowances, over the lease term on a straight-line basis. We also recognize rent expense on a straight-line basis for leases containing fixed escalation clauses and rent holidays. Contingent rentals are included in rent expense as accruable. Operating leases relating to many of our major offices generally contain renewal options, and provide for additional rental based on escalation in operating expenses and real estate taxes.
	The following table presents rent expense and sublease income offsetting the Company’s rent expense during each of the last three fiscal years (in thousands):
			2014			2013			2012
	Rent expense		$	194,796		$	173,340		$	165,221
	Sublease income		(6,102		)	(7,914		)	(8,402		)
	Net rent		$	188,694		$	165,426		$	156,819
	Guarantee
	We are party to a synthetic lease agreement involving certain real and personal property located in Houston, Texas that we use in our operations. A synthetic lease is a type of off-balance sheet transaction which provides us with certain tax and other financial benefits. Significant terms of the lease are as follows:
	End of lease term	2015
	End of term purchase option (in thousands)	$	52,200
	Residual value guaranty (in thousands)	$	38,800
	The lease agreement gives us the right to request an extension of the lease term. We may also assist the owner in selling the property at the end of the lease term, the proceeds from which would be used to reduce our residual value guarantee. In connection with the lease, we entered into a floating-to-fixed interest rate swap agreement with a U.S. bank which fixes the amount of the Company’s lease payments. The notional amount of this hedge at September 26, 2014, was $52.2 million. This instrument allows us to receive a floating rate payment tied to the 1-month LIBOR from the counterparty in exchange for a fixed-rate payment from us. We have determined this interest rate swap to be “highly effective” according to U.S. GAAP. The minimum lease payments required by the lease agreement is included in the above lease pay-out schedule. We have determined that the estimated Fair Value of the aforementioned financial guarantee was not significant at September 26, 2014. The Company is currently exploring refinancing options with respect to the lease agreement.
	Derivative Financial Instruments
	In situations where our operations incur contract costs in currencies other than their functional currency, we attempt to have a portion of the related contract revenues denominated in the same currencies as the costs. In those situations where revenues and costs are transacted in different currencies, we sometimes enter into foreign exchange contracts in order to limit our exposure to fluctuating foreign currencies. The Company does not currently have exchange rate sensitive instruments that would have a material effect on our consolidated financial statements or results of operations.
	Letters of Credit
	Letters of credit outstanding at September 26, 2014 totaled $315.4 million. Of this amount, $2.8 million has been issued under the 2014 Facility and $312.6 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. 26, 2014
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 are subject to certain contractual guarantees and litigation. The guarantees to which we are a party generally relate to project schedules and plant performance. Most of the litigation in which we are involved has us as a defendant in workers' compensation; personal injury; environmental; employment/labor; professional liability; and other similar lawsuits.
	We maintain insurance coverage for various aspects of our business and operations. Our insurance programs have varying coverage limits and maximums, and insurance companies may seek to not pay any claims we might make. We have also elected to retain a portion of losses that occur through the use of various deductibles, limits, and retentions under our insurance programs. As a result, we may be subject to 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 our contracts. 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 and several of its agencies, we are subject to many levels of audits, investigations, and claims by, or on behalf of, the U.S. federal government with respect to our contract performance, pricing, costs, cost allocations, and procurement practices. Furthermore, our income, franchise, and similar tax returns and filings are also subject to audit and investigation by the Internal Revenue Service, most states within the U.S. as well as by various government agencies representing jurisdictions outside the U.S.
	We record in our Consolidated Balance Sheets amounts representing our estimated liability relating to such claims, guarantees, litigation, and 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, and 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.
	Management 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 any material adverse effect on our consolidated financial statements.
	On August 9, 2014, the Company received a Notice of Arbitration from Motiva Enterprises LLC.  The Arbitration is pending in Houston, Texas before the International Institute for Conflict Prevention and Resolution.  In 2006, Motiva contracted with Bechtel-Jacobs CEP Port Arthur Joint Venture (“BJJV”), a joint venture between Bechtel Corporation and Jacobs Engineering Group, Inc.  to perform professional services in connection with the expansion project at the Motiva Port Arthur, TX refinery.  In the Notice of Arbitration, Motiva asserts various causes of action and  alleges entitlement to equitable and monetary relief in excess of $7 billion.  BJJV has denied liability and is vigorously defending these claims.  The Company does not expect this matter to have a material adverse effect on its consolidated financial statements.
	The Company is a defendant in a property damage lawsuit pending in North Carolina's Superior Courts arising out of a June 9, 2009, natural gas explosion at a ConAgra Foods Inc. plant in Garner, Wake County, North Carolina. The Company has settled the personal injury claims and is vigorously defending the property damage claim and believes it has meritorious defenses. In addition, the Company believes it has adequate insurance coverage as well as a right to indemnification from ConAgra. Accordingly, the Company does not expect these matters to have any material adverse effect on its consolidated financial statements.

Common_And_Preferred_Stock

Common And Preferred Stock	12 Months Ended
	Sep. 26, 2014
Class of Stock Disclosures [Abstract]	'
Common And Preferred Stock	'
	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 Board of Directors at the time each series is issued. Except as may be provided by the 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 all other matters requiring stockholder action. The holders of shares of common stock are entitled to dividends if and when declared by the Board of Directors from whatever assets are legally available for that purpose.

Other_Financial_Information

Other Financial Information	12 Months Ended
	Sep. 26, 2014
Other Financial Information [Abstract]	'
Other Financial Information	'
	Other Financial Information
	Receivables
	The following table presents the components of “Receivables” as shown in the accompanying Consolidated Balance Sheets at September 26, 2014, and September 27, 2013 as well as certain other related information (in thousands):
			2014			2013
	Amounts billed, net		$	1,425,341		$	1,389,278
	Unbilled receivables and other		1,368,482			1,109,931
	Retentions receivable		73,732			49,781
	Total receivables, net		$	2,867,555		$	2,548,990
	Other information about receivables:
	Amounts due from the United States federal		$	324,928		$	292,698
	government included above, net of
	advanced billings
	Claims receivable		$	78,634		$	25,237
	Billed receivables, net consist of amounts invoiced to clients in accordance with the terms of the 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 retentions receivable represent reimbursable costs and amounts earned and reimbursable under contracts in progress as of the respective balance sheet dates. Such amounts become billable according to the contract terms, which usually consider the passage of time, achievement of certain milestones or completion of the project. We anticipate that substantially all of such unbilled amounts will be billed and collected over the next twelve months.
	Claims receivable are included in “Receivables” in the accompanying Consolidated Balance Sheets and represent certain costs incurred on contracts to the extent it is probable that such claims will result in additional contract revenue and the amount of such additional revenue can be reliably estimated.
	Property, Equipment, and Improvements, Net
	The following table presents the components of our property, equipment, and improvements, net at September 26, 2014, and September 27, 2013 (in thousands):
			2014			2013
	Land		$	21,497		$	22,027
	Buildings		128,584			131,690
	Equipment		634,415			537,835
	Leasehold improvements		287,814			204,940
	Construction in progress		20,059			22,678
			1,092,369			919,170
	Accumulated depreciation and amortization		(635,572		)	(539,874		)
			$	456,797		$	379,296
	Miscellaneous Noncurrent Assets
	The following table presents the components of “Miscellaneous noncurrent assets” shown in the accompanying Consolidated Balance Sheets at September 26, 2014, and September 27, 2013 (in thousands):
			2014			2013
	Deferred income taxes		$	170,649		$	197,458
	Cash surrender value of life insurance policies		116,686			100,253
	Investments		226,628			194,782
	Notes receivable		8,007			11,689
	Reimbursable pension costs (a)		77,710			84,348
	Other		38,570			26,025
	Total		$	638,250		$	614,555
	(a)	Consists of costs incurred relating to a defined benefit pension plan covering employees providing services on a contract with, and for the benefit of, the U.S. federal government pursuant to which such costs are fully reimbursable.
	Accrued Liabilities
	The following table presents the components of “Accrued liabilities” shown in the accompanying Consolidated Balance Sheets at September 26, 2014 and September 27, 2013 (in thousands):
			2014			2013
	Accrued payroll and related liabilities		$	782,615		$	688,391
	Project-related accruals		218,460			115,418
	Insurance liabilities		52,826			48,209
	Sales and other similar taxes		52,373			47,973
	Deferred rent		96,129			57,581
	Other		77,153			72,244
	Total		$	1,279,556		$	1,029,816
	Other Deferred Liabilities
	The following table presents the components of “Other deferred liabilities” shown in the accompanying Consolidated Balance Sheets at September 26, 2014 and September 27, 2013 (in thousands):
			2014			2013
	Liabilities relating to defined benefit pension		$	407,263		$	416,707
	and early retirement plans
	Liabilities relating to nonqualified deferred		114,325			101,653
	compensation arrangements
	Deferred income taxes		195,098			142,258
	Miscellaneous		117,392			62,486
	Total		$	834,078		$	723,104
	Total Accumulated Other Comprehensive Loss
	The following table presents the components of “Accumulated other comprehensive loss” shown in the accompanying Consolidated Balance Sheets at September 26, 2014, and September 27, 2013 (in thousands):
			2014			2013
	Foreign currency translation adjustments		$	(62,919	)	$	(32,853	)
	Adjustments relating to defined benefit pension plans		(299,210		)	(269,345		)
Other		(1,420		)	(1,929		)
Total		$	(363,549	)	$	(304,127	)
Supplemental Cash Flow Information
During fiscal 2014 and fiscal 2013, the Company acquired businesses for cash and stock of $1.39 billion and $39.4 million, respectively. The following table presents the non-cash adjustments relating to these acquisitions made in preparing the accompanying Consolidated Statements of Cash Flows (in thousands):
		2014			2013
Working capital		$	48,327		$	4,197
Property and equipment		59,216			386
Noncurrent assets		262,450			—
Deferred liabilities		(7,895		)	2,181
Non-controlling interests		16,572			18,589
Foreign currency translation		1,768			(3,461		)
Goodwill		1,005,923			17,537

Segment_Information

Segment Information	12 Months Ended
	Sep. 26, 2014
Segment Reporting [Abstract]	'
Segment Information	'
	Segment Information
	We provide a broad range of technical, professional, and construction services including engineering, design, and architectural services; construction and construction management services; operations and maintenance services; and process, scientific, and systems consulting services. We provide our services through offices and subsidiaries located primarily in North America, South America, Europe, the Middle East, India, Australia, Africa, and Asia. We provide our services under cost-reimbursable and fixed-price contracts.
	All of our operations share similar economic characteristics. For example, all of our operations are highly influenced by the general availability of qualified engineers and other technical professional staff. They also provide similar services as well as share similar processes for delivering our services. There is also a high degree of similarity of the workforces employed among the various categories of services we provide. For example, engineering and design services (i.e., services provided by persons who are degreed, and in certain circumstances licensed, professionals such as engineers, architects, scientists, and economists) exist in all four service categories. In addition, there is a high degree of similarity among a significant component of the workforces we employ to perform construction and operations and maintenance projects. In providing construction and operations and maintenance services, we employ a large number of skilled craft labor personnel. These include welders, pipe fitters, electricians, crane operators, and other personnel who work on very large capital projects (in the case of projects classified within the construction services category) or on smaller capital projects (in the case of maintenance projects classified within the operations and maintenance services category). In addition, the use of technology is highly similar and consistent throughout our organization, as is our client base (with the exception of our operations outside the U.S., which perform very little work for the U.S. federal government), and our quality assurance and safety programs. Furthermore, the types of information and internal reports used by the Company’s chief operating decision maker and other members of management to monitor performance, evaluate results of operations, allocate resources, and otherwise manage the business support a single reportable segment. Accordingly, based on these operational similarities and the way management monitors the Company’s results of operations, we have concluded that our operations may be aggregated into one reportable segment for purposes of this disclosure.
	The following table presents certain financial information by geographic area for fiscal 2014, 2013, and 2012 (in thousands):
			2014			2013		2012
	Revenues:
	United States		$	7,078,366		$	6,993,594	$	6,749,583
	Europe		2,402,399			2,148,504		1,681,421
	Canada		1,344,632			1,652,386		1,564,883
	Asia		299,086			204,203		156,748
	India		148,453			158,908		124,362
	Australia and New Zealand		709,379			141,507		253,932
	South America and Mexico		271,213			241,590		158,141
	Middle East and Africa		441,629			277,684		204,708
	Total		$	12,695,157		$	11,818,376	$	10,893,778
	Long-Lived Assets:
	United States		$	240,501		$	230,281	$	203,746
	Europe		58,562			47,128		46,763
	Canada		51,622			61,122		47,539
	Asia		4,063			4,272		3,580
	India		17,960			15,049		17,094
	Australia		49,436			8,329		7,859
	South America and Mexico		11,084			6,159		2,400
	Middle East and Africa		23,569			6,956		2,150
	Total		$	456,797		$	379,296	$	331,131
	Revenues were earned from unaffiliated clients located primarily within the various and respective geographic areas shown. Long-lived assets consist of property and equipment, net of accumulated depreciation and amortization.
	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 fiscal 2014, 2013, and 2012:
	2014			2013		2012
	17.8	%		19.9	%	22.1	%

Selected_Quarterly_Information

Selected Quarterly Information - Unaudited	12 Months Ended
	Sep. 26, 2014
Selected Quarterly Financial Information [Abstract]	'
Selected Quarterly Information - Unaudited	'
	Selected Quarterly Information — Unaudited
	The following table presents selected quarterly financial information for each of the last three fiscal years. Amounts are presented in thousands, except for per share amounts:
			First		Second			Third			Fourth			Fiscal
			Quarter		Quarter			Quarter			Quarter			Year
	2014
	Revenues		$	3,068,891	$	3,176,033		$	3,231,791		$	3,218,442		$	12,695,157
	Operating profit (a)		145,047		122,434			123,937			136,650			528,068
	Earnings before taxes		146,921		132,394			118,046			144,805			542,166
	Net earnings of the Group		98,949		90,800			71,309			91,054			352,112
	Net earnings attributable to		93,732		83,460		(d)	64,842		(b)	86,074		(b)	328,108
	Jacobs
	Earnings per share:
	Basic		0.72		0.64		(d)	0.5		(b)	0.66		(b)	2.51
	Diluted		0.71		0.63		(d)	0.49		(b)	0.65		(b)	2.48
	2013
	Revenues		$	2,759,641	$	2,835,084		$	3,080,995		$	3,142,656		$	11,818,376
	Operating profit (a)		160,269		165,203			168,359			175,148			668,979
	Earnings before taxes		156,311		161,908			168,423			174,906			661,548
	Net earnings of the Group		104,523		107,089			112,089			116,481			440,182
	Net earnings attributable to		99,010		104,401			108,871			110,811			423,093
	Jacobs
	Earnings per share:
	Basic		0.77		0.81			0.84			0.85			3.27
	Diluted		0.76		0.8			0.83			0.84			3.23
	2012
	Revenues		$	2,631,768	$	2,702,851		$	2,772,874		$	2,786,285		$	10,893,778
	Operating profit (a)		141,952		133,138			153,366			167,617			596,073
	Earnings before taxes		139,554		132,315			151,371			170,096			593,336
	Net earnings of the Group		91,436		87,446			100,990			111,082			390,954
	Net earnings attributable to		89,710		83,933			97,900			107,411		(c)	378,954		(c)
	Jacobs
	Earnings per share:
	Basic		0.71		0.66			0.77			0.84		(c)	2.97		(c)
	Diluted		0.7		0.65			0.76			0.83		(c)	2.94		(c)
	(a)	Operating profit represents revenues less (i) direct costs of contracts, and (ii) selling, general and administrative expenses.
	(b)	Includes costs of $47.0 million, or $0.35 per diluted share, in the third quarter of fiscal 2014, and $30.4 million, or $0.23 per diluted share, in the fourth quarter of fiscal 2014, related to the Company's restructuring activities.
	(c)	Includes an after-tax gain of $4.0 million, or $0.03 per diluted share, related to the sale of the Company's intellectual property for iron ore pelletizing and certain other related assets.
	(d)	Includes $6.4 million, or $0.05 per diluted share, increase to net earnings related to a gain on the sale of certain intellectual property in the second quarter of fiscal 2014.

Definitions

Definitions	12 Months Ended
	Sep. 26, 2014
Definitions [Abstract]	'
Definitions	'
	Definitions
	The following terms used in the accompanying Consolidated Financial Statements and these Notes to Consolidated Financial Statements have the meanings set forth below:
	“1989 ESPP” means the Jacobs Engineering Group Inc. 1989 Employee Stock Purchase Plan, as amended. The 1989 ESPP is a shareholder-approved, broad-based, employee stock purchase plan qualified under Section 423 of the U.S. IRC.
	“1999 ODSP" means the Jacobs Engineering Group Inc. 1999 Outside Director Stock Plan, as amended. The 1999 ODSP is a shareholder-approved, equity-based compensation plan covering Jacobs' non-management directors.
	“1999 SIP” means the Jacobs Engineering Group Inc. Stock Incentive Plan, as amended. The 1999 SIP is a shareholder-approved, equity-based compensation plan covering the Company's officers and key employees.
	The "2014 Restructuring" refers to a series of initiatives intended to improve operational efficiency, reduce costs, accelerate the integration of SKM, and better position the Company to drive growth of the business in the future. Actions included involuntary terminations, the abandonment of certain leased offices, and the co-location of employees. Included in the Company's consolidated results of operations for fiscal 2014 are pre-tax costs of $93.3 million relating to the 2014 Restructuring. These costs are included in selling, general, and administrative expense in the accompanying Consolidated Statements of Earnings.
	“ASC” refers to the Accounting Standards Codification as maintained by the FASB. The ASC is the primary source of U.S. GAAP to be applied by the Company and all other nongovernmental entities. The ASC organizes and presents hundreds of previously separate pieces of authoritative accounting guidance into a single on-line research database. The accounting principles promulgated by the ASC are organized therein by broad topics, and is updated by the FASB through the issuances of ASUs.
	“ASU” means Accounting Standards Updates, the primary means by which the ASC is updated by the FASB.
	“Company” (including “we”, “us” or “our”) means Jacobs Engineering Group Inc. and its consolidated subsidiaries and affiliates.
	“Consolidated EBITDA" generally means consolidated net earnings attributable to Jacobs, plus consolidated (i) interest expense, (ii) tax expense, and (iii) depreciation and amortization expense (including amortization expense relating to intangible assets).
	"Consolidated Funded Indebtedness" generally means the sum of (i) the balances outstanding under all loan, credit, and similar agreements for borrowed money (including purchase money indebtedness), (ii) all amounts representing direct obligations arising under letters of credit, (iii) indebtedness in respect of capital leases and similar financing arrangements, and (iv) the value of all guarantees issued with respect to the types of indebtedness described in (i) through (iii).
	"Consolidated Leverage Ratio" means, as of any date of determination, the ratio of (i) the Company's "Consolidated Funded Indebtedness" as of such date to (ii) the Company's "Consolidated EBITDA" for the immediately preceding four consecutive fiscal quarters.
	“EPS” means earnings-per-share. “Basic EPS” is computed by dividing the consolidated net earnings attributable to Jacobs by the weighted average number of shares of common stock outstanding during the period. “Diluted EPS” is computed in a manner similar to the computation of Basic EPS, but gives effect to all dilutive securities that were outstanding during the period. Our dilutive securities consist of nonqualified stock options and restricted stock (including restricted stock units)
	“Fair Value” means 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 (i.e., the “measurement date”). When determining fair value, U.S. GAAP requires that we consider the principal or most advantageous market in which we would transact any sale or purchase. U.S. GAAP also requires that the inputs (factors) we use (consider) to determine fair value be considered in the following order of priority:
	•	Level 1 inputs are quoted prices in active markets for identical assets or liabilities;
	•	Level 2 inputs are 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 (i.e., 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; and
	•	Level 3 inputs are unobservable inputs to the valuation methodology that are significant to the fair value measurement.
	“FASB” means the Financial Accounting Standards Board. The FASB is the designated organization within the U.S. for establishing standards of financial accounting that govern the preparation of financial reports by nongovernmental entities.
	“GESPP” means the Jacobs Engineering Group Inc. Global Employee Stock Purchase Plan, as amended. The GESPP is a shareholder-approved, broad-based, employee stock purchase plan covering employees of certain of Jacobs' non-U.S. subsidiaries.
	“Group” refers to the combined economic interests and activities of Jacobs and the persons and entities holding noncontrolling interests in the subsidiaries and affiliates that are consolidated into the accompanying Consolidated Financial Statements.
	“Jacobs” means Jacobs Engineering Group Inc.
	“U.S. GAAP” means those accounting principles and practices generally accepted in the United States.
	“U.S. IRC” means the U.S. Internal Revenue Code of 1986, as amended.
	“VIE” means a “Variable Interest Entity” as defined in U.S. GAAP. A VIE is a legal entity in which equity investors do not have sufficient equity at risk for the entity to finance its activities without additional subordinated financial support or, as a group, the holders of the equity investment at risk lack any one of the following three characteristics: (i) the power, through voting rights or similar rights, to direct the activities of a legal entity that most significantly impact the entity's economic performance; (ii) the obligation to absorb the expected losses of the legal entity; or (iii) the right to receive the expected residual returns of the legal entity. Accordingly, entities issuing consolidated financial statements (i.e., a “reporting entity”) shall consolidate a VIE if the reporting entity has a “controlling financial interest” in the VIE, as demonstrated by the reporting entity having both (i) the power to direct the activities of a VIE that most significantly impact the VIE's economic performance; and (ii) the right to receive benefits from the VIE that could potentially be significant to the VIE or the obligation to absorb losses of the VIE that could potentially be significant to the VIE.

Significant_Accounting_Policie1

Significant Accounting Policies (Policy)	12 Months Ended
	Sep. 26, 2014
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]	'
Revenue Accounting For Contracts And Use Of Joint Ventures Policy	'
	Revenue Accounting for Contracts and Use of Joint Ventures
	In general, we recognize revenues at the time we provide services. Depending on the commercial terms of the contract, we recognize revenues either when costs are incurred, or using the percentage-of-completion method of accounting by relating contract costs incurred to date to the total estimated costs at completion. Contract losses are provided for in their entirety in the period they become known, without regard to the percentage-of-completion. For multiple contracts with a single customer we account for each contract separately. We also recognize as revenues costs associated with claims and unapproved change orders to the extent it is probable that such claims and change orders will result in additional contract revenue, and the amount of such additional revenue can be reliably estimated.
	Certain cost-reimbursable contracts include incentive-fee arrangements. The incentive fees in such contracts can be based on a variety of factors but the most common are the achievement of target completion dates, target costs, and/or other performance criteria. Failure to meet these targets can result in unrealized incentive fees. We recognize incentive fees based on expected results using the percentage-of-completion method of accounting. As the contract progresses and more information becomes available, the estimate of the anticipated incentive fee that will be earned is revised as necessary. We bill incentive fees based on the terms and conditions of the individual contracts. In certain situations, we are allowed to bill a portion of the incentive fees over the performance period of the contract. In other situations, we are allowed to bill incentive fees only after the target criterion has been achieved. Incentive fees which have been recognized but not billed are included in receivables in the accompanying Consolidated Balance Sheets.
	Certain cost-reimbursable contracts with government customers as well as certain commercial clients provide that contract costs are subject to audit and adjustment. In this situation, revenues are recorded at the time services are performed based upon the amounts we expect to realize upon completion of the contracts. Revenues are not recognized for non-recoverable costs. In those situations where an audit indicates that we may have billed a client for costs not allowable under the terms of the contract, we estimate the amount of such nonbillable costs and adjust our revenues accordingly.
	When we are directly responsible for subcontractor labor or third-party materials and equipment, we reflect the costs of such items in both revenues and costs (and we refer to such costs as “pass-through” costs). On those projects where the client elects to pay for such items directly and we have no associated responsibility for such items, these amounts are not reflected in either revenues or costs.
	The following table sets forth pass-through costs included in revenues for each of the last three fiscal years (in millions):
	2014				2013			2012
	$	2,954.90			$	2,624.80		$	2,328.40
	As is common to the industry, we execute certain contracts jointly with third parties through various forms of joint ventures and consortiums. Although the joint ventures own and hold the contracts with the clients, the services required by the contracts are typically performed by us and our joint venture partners, or by other subcontractors under subcontracting agreements with the joint ventures. The assets of our joint ventures, therefore, consist almost entirely of cash and receivables (representing amounts due from clients), and the liabilities of our joint ventures consist almost entirely of amounts due to the joint venture partners (for services provided by the partners to the joint ventures under their individual subcontracts) and other subcontractors. In general, at any given time, the equity of our joint ventures represents the undistributed profits earned on contracts the joint ventures hold with clients. Very few of our joint ventures have employees. None of our joint ventures have third-party debt or credit facilities. Our joint ventures, therefore, are simply mechanisms used to deliver engineering and construction services to clients. Rarely do they, in and of themselves, present any risk of loss to us or to our partners separate from those that we would carry if we were performing the contract on our own. Under U.S. GAAP, our share of losses associated with the contracts held by the joint ventures, if and when they occur, has always been reflected in our Consolidated Financial Statements.
	Certain of our joint ventures meet the definition of a VIE. In evaluating our VIEs for possible consolidation, we perform a qualitative analysis to determine whether or not we have a “controlling financial interest” in the VIE as defined by U.S. GAAP. We consolidate only those VIEs over which we have a controlling financial interest.
	For the Company’s unconsolidated joint ventures, we use either the equity method of accounting or proportional consolidation. The Company does not currently participate in any significant VIEs in which it has a controlling financial interest that it does not consolidate.
	There were no changes in facts and circumstances during the period that caused the Company to reassess the method of accounting for its VIEs.
Fair Value Measurements	'
	Fair Value Measurements
	The net carrying amounts of cash and cash equivalents, trade receivables and payables, and notes payable approximate Fair Value due to the short-term nature of these instruments. Similarly, we believe the carrying value of long-term debt also approximates Fair Value based on the interest rates and scheduled maturities applicable to the outstanding borrowings. Certain other assets and liabilities, such as forward contracts and an interest rate swap agreement we purchased as cash-flow hedges discussed in Note 10 —Commitments and Contingencies - 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 (needed for purposes of determining whether there is an indication of possible impairment of the carrying value of goodwill) is determined using a both an income approach and a market approach. Both approaches require us to make 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 the invested capital associated with the guideline companies. In assessing whether there is an indication that the carrying value of goodwill has been impaired, we utilize the results of both valuation techniques and consider the range of Fair Values indicated. The range of values (both ends of the range) for each reporting unit, exceeded the respective book values by more than 40%.
	With respect to 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 highly 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 drastically different Fair Values to be assigned to our stock option awards. For restricted stock units containing service and market conditions, compensation expense is based on the Fair Value of such units using a Monte Carlo simulation. Due to the uncertainties inherent in the use of assumptions and the results of applying Monte Carlo simulations and because equity awards tend to vest over several years and additional equity awards may be made in the future, the amount of expense recorded in the accompanying consolidated financial statements may not be representative of the effects on our future consolidated financial statements.
	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. Debt securities are valued at the last reported sale price on the last business day applicable. Real estate consists primarily of common or collective trusts, with underlying investments in real estate. They 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. Insurance contracts, investments in infrastructure/raw goods, and hedge funds are valued using actuarial assumptions and values reported by the fund managers.
	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 its 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 Equivalents
	We consider all highly liquid investments with original maturities of less than three months to be cash equivalents. Cash equivalents at September 26, 2014 and September 27, 2013 consisted primarily of money market mutual funds and overnight bank deposits.
Receivables And Billings In Excess Of Costs	'
	Receivables and Billings in Excess of Costs
	“Receivables” include billed receivables, unbilled receivables, and retentions receivable. Billed receivables represent amounts invoiced to clients in accordance with the terms of our client contracts. They are recorded in our financial statements when they are issued. Unbilled receivables and retentions receivable represent reimbursable costs and amounts earned and reimbursable under contracts in progress as of the respective balance sheet dates. Such amounts become billable according to the contract terms, which usually consider the passage of time, achievement of certain milestones or completion of the project. We anticipate that substantially all of such unbilled amounts will be billed and collected over the next fiscal year.
	Certain contracts allow us to issue invoices to clients in advance of providing services. “Billings in excess of costs” represent billings to, and cash collected from, clients in advance of work performed. 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 4 to 10 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, we test goodwill for possible impairment. We conduct such tests annually (or more frequently if events occur or circumstances change that would more likely than not reduce the Fair Values of our reporting units below their respective carrying values). The first step in the test is to compare the Fair Value of each of the Company’s reporting units to their respective carrying amounts, including goodwill. In the event that the carrying value of a reporting unit exceeds its Fair Value, a second test is performed to measure the amount of the impairment loss, if any. In performing the annual impairment test, the Company evaluates goodwill at the reporting unit level. We have determined that our operating segment is comprised of two reporting units based on geography. Based on the results of these tests, we have determined that the Fair Value of our reporting units substantially exceeded their respective carrying values for fiscal years 2014, 2013, and 2012.
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 period(s) 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 computed 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 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 Company's Consolidated Financial Statements.
	The following table presents our stock-based compensation expense for the various types of awards made by the Company for each of the fiscal years presented (in thousands):
	Award Type		2014		2013		2012
	Restricted Stock and Restricted		$17,307		$12,836		$11,021
	Stock Units (excluding Market and
	Performance Awards)
	Stock Options		10,829		11,385		14,067
	Market and Performance Awards		15,264		15,297		7,354
	Total Expense		$43,400		$39,518		$32,442
	The Company has two incentive plans whereby eligible employees and directors of Jacobs may be granted stock options, restricted stock, and/or restricted stock units.
	Stock Options—Substantially all of the stock options granted during the year are awarded on the same date (although the date is different for employees and directors). The following table presents the assumptions used in the Black-Scholes option-pricing model during each of the last three fiscal years for awards made to employees and directors:
			Awards Made to Employees							Awards Made to Directors
			2014			2013		2012		2014		2013		2012
	Dividend yield		0	%		0	%	0	%	0	%	0	%	0	%
	Expected volatility		34.25	%		38.37	%	43.28	%	35.3	%	37.65	%	41.42	%
	Risk-free interest rate		1.79	%		1.11	%	0.95	%	1.76	%	0.95	%	1.11	%
	Expected term of options (in years)		5.82			5.82		5.82		5.82		5.82		5.82
	Performance Awards— During fiscal years 2014, 2013, and 2012, the Company granted restricted stock units containing service, performance, and market conditions. The restricted stock unit award is split equally between Relative TSR Restricted Stock Units and Net Earnings Growth Restricted Stock Units.
	The number of Relative TSR Restricted Stock Units in which the employee may ultimately vest shall be equal to the Relative TSR grant multiplied by the TSR Performance Multiplier. The TSR Performance Multiplier will be determined by comparing the Company's total stockholder return to the total stockholder return of each of the companies in a specified industry peer group over the three-year period immediately following the award date. For purposes of computing total stockholder return, the beginning stock price will be the average closing stock price over the 30 calendar day period ending on the award date ("Performance Period"), and the ending stock price will be the average closing price over the 30 calendar day period ending on the last day of the performance period. Any dividend payments made over the Performance Period will be deemed re-invested on the ex-dividend data in additional shares of the related Company.
	The following table presents the basis on which the Relative TSR Restricted Stock Units are determined:
	Company TSR Percentile Rank		TSR Performance Multiplier
	Below 30th percentile		—%
	30th percentile		50%
	50th percentile		100%
	70th percentile or above		150%
	If the Company's total stockholder return over the Performance Period falls between any of the brackets described above, the TSR Performance Multiplier will be determined using straight line interpolation based on the actual percentile ranking.
	Substantially all of the TSR restricted stock units awarded during the year are awarded on the same date. The following table presents the assumptions used to value the TSR restricted stock units:
		2014		2013		2012
	Dividend yield	—	%	—	%	—	%
	Expected volatility	24.77	%	29.18	%	36.3
	Risk-free interest rate	0.8	%	0.42	%	0.42
	Expected term (in years)	3		3		3
	The number of Net Earnings Growth Restricted Stock Units awarded in fiscal year 2012 in which an employee may ultimately vest shall be equal to the sum of the following: (1) an amount, not less than zero, equal to one-third of the earned Net Earnings Growth Restricted Stock Units grant multiplied by the Net Earnings Growth Performance Multiplier (or, "NEGPM", as defined) determined based upon the growth in the Company's Net Earnings (as defined) over the period from April 1, 2012 to March 31, 2013; plus, (2) an amount, not less than zero, equal to (A) two-thirds of the earned Net Earnings Growth Restricted Stock Units grant multiplied by the NEGPM determined based upon the average growth in the Company's Net Earnings over the period from April 1, 2012 to March 31, 2014, minus (B) the amount determined pursuant to (1) above; plus, (3) an amount, not less than zero, equal to (A) the earned Net Earnings Growth Restricted Stock Units grant multiplied by the NEGPM determined based upon the average growth in the Company's Net Earnings over the period from April 1, 2012 to March 31, 2015, minus (B) the amount determined pursuant to (1) and (2) above.
	For Net Earnings Growth Restricted Stock Units awarded in fiscal years 2013 and 2014, all of the criteria referenced in the paragraph above are the same over the three year vesting period with the exception of the performance period. The periods for fiscal years 2013 and 2014 are based upon the Company's Net Earnings (as defined) over the period starting on the first day of the Company's third quarter of fiscal 2013 and ending on the last day of the Company's second quarter of fiscal 2016 and the Company's Net Earnings (as defined) over the period starting on the first day of the Company's third quarter of fiscal 2014 and ending on the last day of the Company's second quarter of fiscal 2017, respectively.
	If the Company's average growth in Net Earnings over the applicable fiscal years during the respective performance periods is between 5% and 10%, 10% and 15%, or 15% and 20%, the Net Earnings Growth Performance Multiplier will be determined using straight line interpolation based on the actual average growth in the Company's consolidated net earnings attributable to Jacobs.
	The following table presents the basis on which the Net Earnings Growth Restricted Stock Units are determined:
	Average Net		Net Earnings Growth
	Earnings Growth		Performance
			Multiplier
	Less than 5%		—%
	5%		50%
	10%		100%
	15%		150%
	20%		200%
	Unless stated otherwise, all other awards are valued based on the closing price of the Company's common stock as reported in the NYSE Composite Price History on their respective grant dates.
Concentrations 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 primarily 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.
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.
	Earlier in these Notes to Consolidated Financial Statements we discussed three significant accounting policies that rely on the application of estimates and assumptions: revenue recognition for long-term construction contracts; the process for testing goodwill for possible impairment; and the accounting for share-based payments to employees and directors. The following is a discussion of certain other significant accounting policies that rely on the use of estimates:
	Accounting for 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.
	Accounting for 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 worldwide 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— 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. 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.
	Accounting for 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. Determining the Fair Value of contract assets and liabilities acquired often requires estimates and judgments regarding, among other things, the estimated cost to complete such contracts. The Company must also make certain estimates and judgments relating to other assets and liabilities acquired as well as any identifiable intangible assets acquired.
New Accounting Pronouncements	'
	New Accounting Pronouncements
	In May 2014, the FASB issued ASU No. 2014-09—Revenue from Contracts with Customers. The new guidance provided by ASU 2014-09 is intended to remove inconsistencies and weaknesses in the existing revenue requirements, provide a more robust framework for addressing revenue issues, improve comparability, provide more useful information and simplify the preparation of financial statements. ASU 2014-09 is effective for annual and interim reporting periods beginning after December 15, 2016. Early adoption is not permitted. The Company is currently evaluating the impact that the new guidance may have on the consolidated financial statements.
	In December 2011, the FASB adopted ASU No. 2011-11—Disclosures about Offsetting Assets and Liabilities. ASU 2011-11 amends Topic 210 of the ASC and requires entities to disclose information about offsetting and related arrangements to enable users of their financial statements to understand the effect of those arrangements on their respective financial positions. The scope of this ASU includes derivatives, sale and repurchase agreements, reverse sale and repurchase agreements, and securities borrowing and securities lending agreements. Entities are required to apply the provisions of ASU 2011-11 for annual reporting periods beginning on or after January 1, 2013. The Company does not believe that the adoption of ASU 2011-11 will have a material effect on its consolidated financial statements.

Description_Of_Business_And_Ba1

Description Of Business And Basis Of Presentation (Tables)	12 Months Ended
	Sep. 26, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Revenues Realized From Each Of These Types Of Contracts	'
	The percentage of revenues realized from each of these types of contracts for each of the last three fiscal years was as follows:
		2014		2013		2012
	Cost-reimbursable	83	%	85	%	85	%
	Fixed-price	17	%	15	%	15	%

Significant_Accounting_Policie2

Significant Accounting Policies (Tables)	12 Months Ended
	Sep. 26, 2014
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]	'
Pass-Through Costs Included In Revenues	'
	The following table sets forth pass-through costs included in revenues for each of the last three fiscal years (in millions):
	2014				2013				2012
	$	2,954.90			$	2,624.80			$	2,328.40
Schedule Of Acquired Intangible Assets	'
	The following table provides certain information related to the Company’s acquired intangible assets for each of the fiscal years presented (in thousands):
			Customer				Developed				Trade			Other				Total
			Relationships,				Technology				Names
			Contracts, and
			Backlog
	Balances, September 30, 2011		$	229,738			$	21,977			$	3,473		$	3,818			$	259,006
	Acquisitions		13,010				—				1,200			410				14,620
	Amortization		(24,406		)		(1,533		)		(1,430		)	(1,597		)		(28,966		)
	Foreign currency translation		(613		)		—				(161		)	(124		)		(898		)
	Balances, September 28, 2012		217,729				20,444				3,082			2,507				243,762
	Acquisitions		—				—				—			—				—
	Amortization		(20,731		)		(1,533		)		(614		)	(1,130		)		(24,008		)
	Foreign currency translation		(1,471		)		—				(289		)	(90		)		(1,850		)
	Balances, September 27, 2013		195,527				18,911				2,179			1,287				217,904
	Acquisitions		249,164				—				15,049			—				264,213
	Amortization		(37,737		)		(1,533		)		(3,251		)	(693		)		(43,214		)
	Foreign currency translation		1,087				—				171			31				1,289
	Balances, September 26, 2014		$	408,041			$	17,378			$	14,148		$	625			$	440,192
	Weighted average amortization period (years)		10.2				12				4			11.6				10.1
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	'
	The following table presents the preliminary allocation of the purchase price (in thousands) paid for SKM:
	Assets:
	Cash and cash equivalents	$	152,051
	Receivables and other current assets	367,580
	Property and equipment, and other	71,630
	Intangible assets	202,166
	Total assets	793,427
	Liabilities:
	Current liabilities	333,298
	Deferred tax liability	70,758
	Long-term liabilities	20,416
	Total liabilities	424,472
	Net identifiable assets acquired	$	368,955
	Goodwill	850,719
	Net assets acquired	$	1,219,674
Business Acquisition, Pro Forma Information	'
	The pro forma results are not necessarily indicative of (i) the results of operations that would have occurred had we actually acquired SKM on September 28, 2012; or (ii) future results of operations:
		2014				2013
	Revenues	$	12,944,848			$	13,064,768
	Net earnings attributable to Jacobs	$	335,658			$	488,434
	Basic earnings per share	$	2.57			$	3.78
	Diluted earnings per share	$	2.54			$	3.73
Stock-based Compensation Expense By Type of Award	'
	The following table presents our stock-based compensation expense for the various types of awards made by the Company for each of the fiscal years presented (in thousands):
	Award Type		2014		2013		2012
	Restricted Stock and Restricted		$17,307		$12,836		$11,021
	Stock Units (excluding Market and
	Performance Awards)
	Stock Options		10,829		11,385		14,067
	Market and Performance Awards		15,264		15,297		7,354
	Total Expense		$43,400		$39,518		$32,442
	The following table sets forth certain information about the 1999 Plans:
			1999 SIP			1999 ODSP			Total
	Number of shares authorized		29,850,000			800,000			30,650,000
	Number of remaining shares reserved for issuance at September 26, 2014		11,072,944			357,000			11,429,944
	Number of shares relating to outstanding stock options at September 26, 2014		3,954,272			266,875			4,221,147
	Number of shares available for future awards:
	At September 26, 2014		7,118,672			90,125			7,208,797
	At September 27, 2013		5,099,632			140,125			5,239,757
Fair Value Of Option Grant Date Award	'
	The following table presents the assumptions used in the Black-Scholes option-pricing model during each of the last three fiscal years for awards made to employees and directors:
			Awards Made to Employees									Awards Made to Directors
			2014			2013			2012			2014		2013			2012
	Dividend yield		0	%		0	%		0	%		0	%	0	%		0	%
	Expected volatility		34.25	%		38.37	%		43.28	%		35.3	%	37.65	%		41.42	%
	Risk-free interest rate		1.79	%		1.11	%		0.95	%		1.76	%	0.95	%		1.11	%
	Expected term of options (in years)		5.82			5.82			5.82			5.82		5.82			5.82
Unit Basis For Earned Relative TSR Restricted Stock	'
	The following table presents the basis on which the Relative TSR Restricted Stock Units are determined:
	Company TSR Percentile Rank		TSR Performance Multiplier
	Below 30th percentile		—%
	30th percentile		50%
	50th percentile		100%
	70th percentile or above		150%
Schedule of Fair Value Assumptions for Earned Relative TSR Restricted Stock Units	'
	The following table presents the assumptions used to value the TSR restricted stock units:
		2014		2013		2012
	Dividend yield	—	%	—	%	—	%
	Expected volatility	24.77	%	29.18	%	36.3
	Risk-free interest rate	0.8	%	0.42	%	0.42
	Expected term (in years)	3		3		3
Unit Basis for Earned Net Earnings Growth Restricted Stock Units	'
	The following table presents the basis on which the Net Earnings Growth Restricted Stock Units are determined:
	Average Net		Net Earnings Growth
	Earnings Growth		Performance
			Multiplier
	Less than 5%		—%
	5%		50%
	10%		100%
	15%		150%
	20%		200%

Stock_Purchase_And_Stock_Optio1

Stock Purchase And Stock Option Plans (Tables)	12 Months Ended
	Sep. 26, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Stock Issuance Activity Under The 1989 ESPP And The GESPP	'
	The following table summarizes the stock issuance activity under the 1989 ESPP and the GESPP during each of the last three fiscal years:
			2014				2013				2012
	Aggregate Purchase Price Paid for Shares Sold:
	Under the 1989 ESPP		$	30,354,723			$	30,012,848			$	32,236,660
	Under the GESPP		3,314,046				3,068,578				2,944,987
	Total		$	33,668,769			$	33,081,426			$	35,181,647
	Aggregate Number of Shares Sold:
	Under the 1989 ESPP		553,201				642,675				853,819
	Under the GESPP		59,883				64,963				76,360
	Total		613,084				707,638				930,179
Stock Purchase And Stock Option Plans Information On The 1999 Plans	'
	The following table presents our stock-based compensation expense for the various types of awards made by the Company for each of the fiscal years presented (in thousands):
	Award Type		2014		2013		2012
	Restricted Stock and Restricted		$17,307		$12,836		$11,021
	Stock Units (excluding Market and
	Performance Awards)
	Stock Options		10,829		11,385		14,067
	Market and Performance Awards		15,264		15,297		7,354
	Total Expense		$43,400		$39,518		$32,442
	The following table sets forth certain information about the 1999 Plans:
			1999 SIP			1999 ODSP			Total
	Number of shares authorized		29,850,000			800,000			30,650,000
	Number of remaining shares reserved for issuance at September 26, 2014		11,072,944			357,000			11,429,944
	Number of shares relating to outstanding stock options at September 26, 2014		3,954,272			266,875			4,221,147
	Number of shares available for future awards:
	At September 26, 2014		7,118,672			90,125			7,208,797
	At September 27, 2013		5,099,632			140,125			5,239,757
Fair Value Of Shares Vested	'
	The following table presents the Fair Value of shares (of restricted stock and restricted stock units) vested during each of the last three fiscal years (in thousands):
			2014				2013				2012
	Restricted Stock and Restricted Stock Units (service condition)		$	6,820			$	13,054			$	7,955
	Restricted Stock Units (service, market, and performance conditions at target)		18,675				—				—
	Total		$	25,495			$	13,054			$	7,955
Total Pre-Tax Compensation Cost Relating To Share-Based Payments Included In The Accompanying Consolidated Statements Of Earnings	'
	The following table presents the Company’s total pre-tax compensation cost relating to share-based payments included in the accompanying Consolidated Statements of Earnings (in thousands):
	2014				2013				2012
	$	43,400			$	39,518			$	32,442
Stock Options Activity	'
	The following table summarizes the stock option activity for each of the last three fiscal years:
			Number of			Weighted
			Stock			Average
			Options			Exercise
						Price
	Outstanding at September 30, 2011		6,461,510			$	43.28
	Granted		658,700			$	37.45
	Exercised		(1,281,449	)		$	22.54
	Cancelled or expired		(82,027	)		$	43.92
	Outstanding at September 28, 2012		5,756,734			$	47.23
	Granted		753,450			$	54.71
	Exercised		(1,782,371	)		$	37
	Cancelled or expired		(121,601	)		$	50.22
	Outstanding at September 27, 2013		4,606,212			$	52.33
	Granted		602,525			$	53.51
	Exercised		(718,065	)		$	47.18
	Cancelled or expired		(269,525	)		$	54.46
	Outstanding at September 26, 2014		4,221,147			$	53.23
Total Intrinsic Value Of Options Exercised	'
	The following table presents the total intrinsic value of stock options exercised during each of the last three fiscal years (in thousands):
	2014				2013				2012
	$	9,590			$	22,163			$	26,196
Information Regarding Our Stock Option Plans	'
	The following table presents certain other information regarding our 1999 Plans:
			2014				2013				2012
	At fiscal year end:
	Range of exercise prices for options outstanding		$25.87–$94.11				$20.98–$94.11				$18.49–$94.11
	Number of options exercisable		2,725,980				3,034,111				4,219,557
	For the fiscal year:
	Range of prices relating to options exercised		$20.98–$57.54				$18.49–$56.95				$13.29–$37.73
	Estimated weighted average Fair Values of options granted		$	19.04			$	20.64			$	15.55
Information Regarding Options Outstanding, And Options Exercisable	'
	The following table presents certain information regarding stock options outstanding, and stock options exercisable at September 26, 2014:
			Options Outstanding									Options Exercisable
	Range of Exercise Prices		Number			Weighted		Weighted				Number	Weighted
						Average		Average					Average
						Remaining		Price					Exercise
						Contractual							Price
						Life
						(years)
	$25.87 - $26.80		21,500			0.44		$	26.73			21,500	$	26.73
	$32.51 - $37.32		531,375			7.55		37.01				269,625	37
	$37.43 - $46.37		1,460,412			5.44		42.39				1,363,037	42.3
	$47.11 - $55.04		1,453,911			8.53		52.99				397,644	51.02
	$55.13 - $57.81		17,000			5.04		56.51				10,250	57.27
	$60.08 - $83.61		165,075			5.31		70.4				92,050	78.42
	$88.19 - $94.11		571,874			0.64		92.57				571,874	92.57
			4,221,147			6.09		$	53.23			2,725,980	$	—
Restricted Stock and Restricted Stock Units Activity	'
	The following table presents the number of shares of restricted stock and restricted stock units issued under the 1999 SIP during each of the last three fiscal years:
			2014(1)			2013(1)			2012
	Restricted stock		589,150			445,200			497,100
	Restricted stock units (service condition)		287,545			107,500			116,450
	Restricted stock units (service, market, and performance conditions at target)		432,700			471,250			525,000
	The amount of restricted stock units issued for awards with performance and market conditions in the above table are based on 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 described in Note 2 – Significant Accounting Policies.
	The following table presents the number of shares of restricted stock and restricted stock units cancelled and withheld for taxes under the 1999 SIP during each of the last three fiscal years:
			2014(1)(2)			2013(1)(2)			2012
	Restricted stock		147,221			128,923			80,460
	Restricted stock units (service condition)		12,333			3,385			5,650
	Restricted stock units (service, market, and performance conditions at target)		52,000			32,000			22,000
	The amount of restricted stock units cancelled for awards with market and performance conditions in the above table is based on the target amount.
	(1) The share amounts in the above tables for fiscal 2013 and 2014 reflect the fungible share counting of 1.92 shares for each share of restricted stock and restricted stock unit issued.
	(2) Commencing in fiscal 2013, shares withheld for withholding tax liabilities are available for awards under the 1999 SIP and have been included in the table above for fiscal 2013 and 2014 only.
	The following table provides the number of shares of restricted stock and restricted stock units outstanding at September 26, 2014 under the 1999 SIP. Shares granted prior to September 29, 2012 were granted on a 1-to-1 basis ("Not Fungible"). Shares Granted after September 28, 2012 were issued on a 1.92-to-1.00 basis ("Fungible"):
			Not Fungible			Fungible			Total
	Restricted stock		929,990			985,400			1,915,390
	Restricted stock units (service condition)		103,920			384,995			488,915
	Restricted stock units (service, market, and performance conditions at target)		475,000			871,950			1,346,950
	The following table presents the number of shares of restricted stock and restricted stock units issued under the 1999 ODSP during each of the last three fiscal years:
			2014			2013			2012
	Restricted stock units (service condition)		15,000			13,500			8,000
	The following table provides the number of shares of restricted stock and restricted stock units outstanding at September 26, 2014 under the 1999 ODSP (all shares granted under the 1999 ODSP are issued on a 1-to-1 basis):
			2014
	Restricted stock		40,000
	Restricted stock units (service condition)		62,500
	All shares granted under the 1999 ODSP are issued on a 1-to-1 basis.

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	12 Months Ended
	Sep. 26, 2014
Earnings Per Share Reconciliation [Abstract]	'
Earnings Per Share	'
	The following table (i) reconciles the denominator used to compute Basic EPS to the denominator used to compute Diluted EPS for each of the last three fiscal years, and (ii) discloses the number of antidilutive stock options, shares of restricted stock, and restricted stock units outstanding at the end of each of the fiscal years indicated (in thousands):
			2014	2013		2012
	Shares used to calculate EPS:
	Weighted average shares outstanding		130,483	129,288		127,644
	(denominator used to compute basic EPS)
	Effect of stock options and restricted stock		1,888	1,657		1,048
	Denominator used to compute diluted EPS		132,371	130,945		128,692
	Antidilutive stock options, shares of restricted stock, and restricted stock units		2,074	2,603		5,093
Class of Treasury Stock	'
	On August 19, 2014, the Company's Board of Directors authorized a new share repurchase program of up to $500 million of the Company's common stock. The following table summarizes the activity under this program during fiscal 2014 (in thousands, except per-share amounts):
		Amount Authorized		Average Price Per Share (1)			Total Shares Retired	Shares Repurchased
		(in thousands)						2014
		$	500,000	$	52.27		1,500	1,500
	-1	Includes commissions paid and calculated as the average price per share since the repurchase
	program authorization date.

Borrowings_Tables

Borrowings (Tables)	12 Months Ended
	Sep. 26, 2014
Debt Disclosure [Abstract]	'
Schedule of Long-term Debt Instruments	'
	The following table presents certain information regarding the Company’s long-term revolving credit facilities at September 26, 2014, and September 27, 2013 (dollars in thousands):
	2014						2013
	Principal				Range		Principal				Range
	Balance				of Interest		Balance				of Interest
	Outstanding				Rates		Outstanding				Rates
	$	764,075			1.0% – 1.51%		$	415,086			0.96% – 1.37%
Schedule Of Other Loan Agreements	'
	The following table presents certain additional information regarding the Company’s 2014 and 2012 Facilities for the fiscal years shown:
			2014				2013
	Maximum amount outstanding at any month-end during the fiscal year		$	1,036,066			$	526,602
	Average amount outstanding during the year		$	866,264			$	470,343
	Weighted average interest rate during the year		1.18		%		1.11		%
Schedule Of Interest Expense	'
	The following table presents the amount of interest paid by the Company during each of the last three fiscal years (in thousands):
	2014				2013				2012
	$	13,841			$	6,685			$	8,572

Pension_Plans_Tables

Pension Plans (Tables)	12 Months Ended
	Sep. 26, 2014
Schedule Of Change In Plans' Combined Net Benefit Obligation	'
	The following table sets forth the changes in the plans’ combined net benefit obligation (segregated between plans existing within and outside the U.S.) during each of the fiscal years presented (in thousands):
			U.S. Pension Plans								Non-U.S. Pension Plans
			2014				2013				2014			2013
	Net benefit obligation at the		$	468,439			$	509,605			$	1,307,331		$	1,191,345
	beginning of the year
	Service cost		12,077				13,814				25,374			30,117
	Interest cost		22,041				18,569				54,208			51,331
	Participants’ contributions		3,095				3,071				9,082			11,805
	Actuarial (gains)/losses		27,076				(42,689		)		105,838			57,764
	Benefits paid		(35,634		)		(33,960		)		(33,387		)	(34,058		)
	Curtailments and settlements		—				—				(269,580		)	(6,297		)
	Plan amendments		(1,306		)		—				—			109
	Special termination benefits		—				29				—			—
	Effect of exchange rate changes		—				—				(2,346		)	5,215
	Net benefit obligation at the end		$	495,788			$	468,439			$	1,196,520		$	1,307,331
	of the year
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.) during each of the fiscal years presented (in thousands):
			U.S. Pension Plans								Non-U.S. Pension Plans
			2014				2013				2014			2013
	Fair Value of plan assets at the		$	390,777			$	359,348			$	982,479		$	877,950
	beginning of the year
	Actual return on plan assets		45,484				53,495				130,665			72,368
	Employer contributions		11,628				8,823				57,977			53,885
	Participants’ contributions		3,095				3,071				9,082			11,805
	Gross benefits paid		(35,634		)		(33,960		)		(33,387		)	(34,058		)
	Business combinations/consolidations		—				—				—			—
	Curtailments/settlements		—				—				(268,486		)	(4,973		)
	Effect of exchange rate changes		—				—				(2,159		)	5,502
	Fair Value of plan assets at the		$	415,350			$	390,777			$	876,171		$	982,479
	end of the year
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 26, 2014, and September 27, 2013 (segregated between plans existing within and outside the U.S.) (in thousands):
			U.S. Pension Plans								Non-U.S. Pension Plans
			2014				2013				2014			2013
	Net benefit obligation at the end		$	495,788			$	468,439			$	1,196,520		$	1,307,331
	of the year
	Fair Value of plan assets at the end		415,350				390,777				876,171			982,479
	of the year
	Under-funded amount recognized		$	80,438			$	77,662			$	320,349		$	324,852
	at the end of the year
Schedule of Accumulated and Projected Benefit Obligations	'
	The following table presents the accumulated benefit obligation at September 26, 2014, and September 27, 2013 (segregated between plans existing within and outside the U.S.) (in thousands):
			U.S. Pension Plans								Non-U.S. Pension Plans
			2014				2013				2014			2013
	Accumulated benefit obligation at the		$	455,245			$	431,726			$	1,128,715		$	1,222,234
	end of the year
Schedule Of Amount Recognized In Accompanying Balance Sheets	'
	The following table presents the amounts recognized in the accompanying Consolidated Balance Sheets at September 26, 2014, and September 27, 2013 (segregated between plans existing within and outside the U.S.) (in thousands):
			U.S. Pension Plans								Non-U.S. Pension Plans
			2014				2013				2014			2013
	Prepaid benefit cost included in		$	—			$	—			$	7,123		$	15,193
	prepaid assets
	Accrued benefit cost included in		—				—				1,447			1,000
	current liabilities
	Accrued benefit cost included in		80,438				77,662				326,025			339,045
	noncurrent liabilities
	Net amount recognized at the end of		$	80,438			$	77,662			$	320,349		$	324,852
	the year
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 pension plans recorded in accumulated other comprehensive loss that have not yet been recognized as components of net periodic benefit cost at September 26, 2014, and September 27, 2013 (segregated between plans existing within and outside the U.S.) (in thousands):
			U.S. Pension Plans								Non-U.S. Pension Plans
			2014				2013				2014			2013
	Net actuarial loss		$	49,569			$	50,446			$	263,913		$	228,074
	Prior service cost		—				—				(487		)	(466		)
	Total		$	49,569			$	50,446			$	263,426		$	227,608
Schedule Of Accumulated Comprehensive Income Amortized Against Earnings In The 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 2015 based on 2014 exchange rates (segregated between plans existing within and outside the U.S.) (in thousands):
			U.S.				Non-U.S.
			Pension				Pension
			Plans				Plans
	Unrecognized net actuarial loss		$	3,756			$	18,505
	Unrecognized prior service cost		(239		)		(99		)
	Accumulated comprehensive loss to be recorded against earnings		$	3,517			$	18,406
Schedule Of Weighted Average Measurement Of Assets And Liabilities	'
	The plans’ weighted average asset allocations at September 26, 2014, and September 27, 2013 (the measurement dates used in valuing the plans’ assets and liabilities) were as follows:
			U.S. Pension Plans						Non-U.S. Pension Plans
			2014			2013			2014			2013
	Equity securities		75	%		74	%		29	%		32	%
	Debt securities		21	%		20	%		32	%		31	%
	Real estate investments		—	%		1	%		7	%		6	%
	Other		4	%		5	%		32	%		31	%
Anticipated Cash Contributions	'
	The following table presents the amount of cash contributions we anticipate making into the plans during fiscal 2015 (in thousands):
	U.S.				Non-U.S.
	Pension Plans				Pension  Plans
	$	4,000			$	38,079
Schedule Of Expected Payments To Participants In Pension Plan	'
	The following table presents the total benefit payments expected to be paid to pension plan participants during each of the next five fiscal years, and in total for the five years thereafter (in thousands):
			U.S. Pension Plans				Non-U.S.
							Pension  Plans
	2015		$	38,355			$	34,024
	2016		40,911				33,485
	2017		43,283				35,170
	2018		40,881				37,757
	2019		40,955				38,445
	For the period 2020 through 2024		208,013				242,260
Schedule Of Contribution To Multiemployer Pension Plans	'
	The following table presents the Company’s contributions to these multiemployer plans during each of the last three fiscal years (in thousands):
			2014				2013				2012
	Canada		$	56,341			$	72,660			$	72,053
	Europe and Australia		12,693				12,930				10,808
	United States		4,485				4,366				4,420
	Total		$	73,519			$	89,956			$	87,281
U.S. Pension Plans	'
Schedule Of Significant Actuarial Assumptions In Determining The 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 each fiscal year presented:
			2014			2013			2012
	Weighted average discount rates		3.9% to 4.4%			4.4% to 5.0%			3.4% to 3.9%
	Rates of compensation increases		2.95	%		2.8	%		3.25	%
	Expected long-term rates of return		7.7	%		7.7	%		7.5	%
	on plan assets
Schedule Of Pension Plans Recognized In Accumulated Other Comprehensive Loss	'
	The following table presents certain amounts relating to our U.S. pension plans recognized in accumulated other comprehensive loss at September 26, 2014, September 27, 2013 and September 28, 2012(in thousands):
			2014				2013				2012
	Arising during the period:
	Net actuarial (gain) loss		$	1,378			$	(15,850	)		$	2,756
	Reclassification adjustments:
	Net actuarial gain		(2,255		)		(2,674		)		(2,011		)
	Total		$	(877	)		$	(18,524	)		$	745
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 26, 2014, segregated by level of Fair Value measurement inputs within the Fair Value hierarchy promulgated by U.S. GAAP (in thousands):
			Fair Values By Level of
			Fair Value Measurement Inputs
			Level 1				Level 3				Total
	Domestic equities		$	268,674			$	—			$	268,674
	Overseas equities		40,587				—				40,587
	Domestic bonds		85,853				—				85,853
	Cash and equivalents		3,932				—				3,932
	Real estate		—				—				—
	Hedge funds		—				16,304				16,304
	Total		$	399,046			$	16,304			$	415,350
	The following table presents the Fair Value of the Company’s U.S. pension plan assets at September 27, 2013, segregated by level of Fair Value measurement inputs within the Fair Value hierarchy promulgated by U.S. GAAP (in thousands):
			Fair Values By Level of
			Fair Value Measurement Inputs
			Level 1				Level 3				Total
	Domestic equities		$	247,155			$	—			$	247,155
	Overseas equities		40,719				—				40,719
	Domestic bonds		79,482				—				79,482
	Cash and equivalents		3,499				—				3,499
	Real estate		—				4,411				4,411
	Hedge funds		—				15,511				15,511
	Total		$	370,855			$	19,922			$	390,777
Summary Of Changes In The Fair Value Of The Plans' Level 3 Assets	'
	The following table summarizes the changes in the Fair Value of the Company’s U.S. Pension Plans’ Level 3 assets for the year ended September 26, 2014 (in thousands):
			Real				Hedge
			Estate				Funds
	Balance, beginning of year		$	4,411			$	15,511
	Sale		(4,411		)		—
	Realized and unrealized gains (losses)		—				793
	Balance, end of year		$	—			$	16,304
	The following table summarizes the changes in the Fair Value of the Company’s U.S. Pension Plans’ Level 3 assets for the year ended September 27, 2013 (in thousands):
			Real				Hedge
			Estate				Funds
	Balance, beginning of year		$	4,841			$	14,471
	Transfers		—				—
	Realized and unrealized losses		(430		)		1,040
	Balance, end of year		$	4,411			$	15,511
Schedule Of Components Of Net Periodic Pension Cost Recognized	'
	The following table presents the components of net periodic benefit cost for the Company’s U.S. pension plans recognized in the accompanying Consolidated Statements of Earnings for each of the last three fiscal years (in thousands):
			2014				2013				2012
	Service cost		$	12,077			$	13,814			$	12,838
	Interest cost		22,041				18,569				20,923
	Expected return on plan assets		(28,495		)		(25,826		)		(23,764		)
	Actuarial loss		3,608				8,030				10,981
	Prior service cost		(103		)		(103		)		(103		)
	Net pension cost, before special items		9,128				14,484				20,875
	Special termination benefits		—				29				—
	Settlement loss		—				—				6,035
	Total net periodic pension cost recognized		$	9,128			$	14,513			$	26,910
Non-U.S. Pension Plans	'
Schedule Of Significant Actuarial Assumptions In Determining The 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. pension plans for each fiscal year presented:
			2014		2013		2012
	Weighted average discount rates		1.8% to 8.8%		0.4% to 9.3%		0.6% to 8.4%
	Rates of compensation increases		2.6% to 7.5%		2.5% to 7.5%		2.8% to 7.5%
	Expected long-term rates of return		4.5% to 8.5%		0.4% to 8.5%		2.4% to 8.5%
	on plan assets
Schedule Of Pension Plans Recognized In Accumulated Other Comprehensive Loss	'
	The following table presents certain amounts relating to our Non-U.S. pension plans recognized in accumulated other comprehensive loss at September 26, 2014, September 27, 2013 and September 28, 2012 (in thousands):
			2014				2013				2012
	Arising during the period:
	Net actuarial loss (gain)		$	48,752			$	27,417			$	83,298
	Prior service cost (benefit)		(1		)		297				(1,947		)
	Total		48,751				27,714				81,351
	Reclassification adjustments:
	Net actuarial gain		(12,914		)		(9,778		)		(6,131		)
	Prior service cost (benefit)		(19		)		41				(23		)
	Total		(12,933		)		(9,737		)		(6,154		)
	Total		$	35,818			$	17,977			$	75,197
Schedule Of Fair Value Of Pension Plan Assets	'
	The following table presents the Fair Value of the Company’s Non-U.S. pension plan assets at September 26, 2014, segregated by level of Fair Value measurement inputs within the Fair Value hierarchy promulgated by U.S. GAAP (in thousands):
			Fair Values By Level of
			Fair Value Measurement Inputs
			Level 1				Level 3				Total
	Domestic equities		$	33,842			$	—			$	33,842
	Overseas equities		218,779				—				218,779
	Domestic bonds		198,344				—				198,344
	Overseas bonds		76,349				—				76,349
	Cash and equivalents		37,487				—				37,487
	Real estate		—				59,966				59,966
	Insurance contracts		—				37,468				37,468
	Hedge funds		—				213,936				213,936
	Total		$	564,801			$	311,370			$	876,171
	The following table presents the Fair Value of the Company’s Non-U.S. pension plan assets at September 27, 2013, segregated by level of Fair Value measurement inputs within the Fair Value hierarchy promulgated by U.S. GAAP (in thousands):
			Fair Values By Level of
			Fair Value Measurement Inputs
			Level 1				Level 3				Total
	Domestic equities		$	108,261			$	—			$	108,261
	Overseas equities		207,607				—				207,607
	Domestic bonds		230,202				—				230,202
	Overseas bonds		76,372				—				76,372
	Cash and equivalents		28,185				—				28,185
	Infrastructure / raw Goods		—				7,076				7,076
	Real estate		—				57,173				57,173
	Insurance contracts		—				21,214				21,214
	Hedge funds		—				246,389				246,389
	Total		$	650,627			$	331,852			$	982,479
Summary Of Changes In The Fair Value Of The 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 year ended September 26, 2014 (in thousands):
			Infrastructure				Real				Insurance			Hedge
			/ Raw Goods				Estate				Contracts			Funds
	Balance, beginning of year		$	7,076			$	57,173			$	21,214		$	246,389
	Purchases, sales, and settlements		(8,125		)		(6,022		)		975			4,915
	Realized and unrealized gains		1,025				8,341				926			(41,096		)
	Transfers		—				—				15,756			—
	Effect of exchange rate changes		24				474				(1,403		)	3,728
	Balance, end of year		$	—			$	59,966			$	37,468		$	213,936
	The following table summarizes the changes in the Fair Value of the Company’s Non-U.S. Pension Plans’ Level 3 assets for the year ended September 27, 2013 (in thousands):
			Infrastructure				Real				Insurance			Hedge
			/ Raw Goods				Estate				Contracts			Funds
	Balance, beginning of year		$	6,111			$	49,537			$	18,291		$	93,400
	Purchases, sales, and settlements		—				—				1,646			144,441
	Realized and unrealized gains		678				7,670				1,058			4,664
	Transfers		—				—				—			—
	Effect of exchange rate changes		287				(34		)		219			3,884
	Balance, end of year		$	7,076			$	57,173			$	21,214		$	246,389
Schedule Of Components Of Net Periodic Pension Cost Recognized	'
	The following table presents the components of net periodic benefit cost for the Company’s Non-U.S. pension plans recognized in the accompanying Consolidated Statements of Earnings for each of the last three fiscal years (in thousands):
			2014				2013				2012
	Service cost		$	25,374			$	30,117			$	22,723
	Interest cost		54,208				51,331				54,287
	Expected return on plan assets		(56,394		)		(54,817		)		(50,996		)
	Actuarial loss		15,993				13,276				8,227
	Prior service cost		(28		)		(43		)		152
	Net pension cost, before special		39,153				39,864				34,393
	items
	Curtailments and settlements		(15,894		)		(383		)		1,326
	Total net periodic pension cost		$	23,259			$	39,481			$	35,719
	recognized

Other_Comprehensive_Income_Tab

Other Comprehensive Income (Tables)	12 Months Ended
	Sep. 26, 2014
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax [Abstract]	'
Reclassification out of Accumulated Other Comprehensive Income	'
	The following table presents amounts reclassified from changes in pension liabilities in other comprehensive income to direct cost of contracts and selling, general and administrative expenses in the Company's Consolidated Statements of Earnings for the periods presented related to the Company's defined benefit pension plans (in thousands):
		2014			2013			2012
	Amortization of Defined Benefit Items:
	Actuarial losses	$	(19,601	)	$	(17,554	)	$	(11,444	)
	Prior service benefit (cost)	28			43			(152		)
	Total Before Income Tax	(19,573		)	(17,511		)	(11,596		)
	Income Tax Benefit	4,385			5,859			3,955
	Total reclassifications after-tax	$	(15,188	)	$	(11,652	)	$	(7,641	)

Savings_And_Deferred_Compensat1

Savings And Deferred Compensation Plans (Tables)	12 Months Ended
	Sep. 26, 2014
Savings And Deferred Compensation Plans [Abstract]	'
Schedule Of Savings Plans Contributions	'
	The following table presents the Company’s contributions to these savings plans during each of the last three fiscal years (in thousands):
	2014		2013		2012
	$	88,951	$	74,686	$	70,211
Schedule Of Deferred Compensation Plans Expense	'
	The following table presents the amount charged to expense for the Company’s deferred compensation plans during each of the last three fiscal years (in thousands):
	2014		2013		2012
	$	5,321	$	4,470	$	4,349

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Sep. 26, 2014
Income Tax Disclosure [Abstract]	'
Components Of Consolidated Income Tax Expense	'
	The following table presents the components of our consolidated income tax expense for each of the last three fiscal years (in thousands):
			2014				2013				2012
	Current income tax expense:
	Federal		$	102,450			$	121,302			$	111,035
	State		18,698				23,246				23,303
	Foreign		38,107				74,107				69,080
	Total current tax expense		159,255				218,655				203,418
	Deferred income tax expense (benefit):
	Federal		7,561				(4,718		)		(2,505		)
	State		2,789				(582		)		(1,985		)
	Foreign		20,449				8,011				3,454
	Total deferred income tax		30,799				2,711				(1,036		)
	expense (benefit)
	Consolidated income tax expense		$	190,054			$	221,366			$	202,382
Components Of Deferred Tax Assets	'
	The following table presents the components of our net deferred tax assets at September 26, 2014, and September 27, 2013 (in thousands):
			2014				2013
	Deferred tax assets:
	Obligations relating to:
	Defined benefit pension plans		$	67,822			$	97,349
	Other employee benefit plans		215,863				198,869
	Net operating losses		64,063				41,836
	Self-insurance programs		4,672				1,758
	Contract revenues and costs		39,734				19,468
	Other		3,039				6,564
	Valuation allowance		(54,651		)		(37,300		)
	Gross deferred tax assets		340,542				328,544
	Deferred tax liabilities:
	Depreciation and amortization		(193,726		)		(127,974		)
	Residual US tax on unremitted non-US		—				(6,724		)
	earnings
	Other, net		(1,372		)		(7,560		)
	Gross deferred tax liabilities		(195,098		)		(142,258		)
	Net deferred tax assets		$	145,444			$	186,286
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 realized from the exercise of nonqualified stock options and disqualifying dispositions of stock sold under our employee stock purchase plans during each of the last three fiscal years (in millions):
	2014				2013				2012
	$	3.4			$	7.3			$	9.3
Income Tax Expense In Consolidated Statements Of Earnings	'
	The following table reconciles total income tax expense using the statutory U.S. federal income tax rate to the consolidated income tax expense shown in the accompanying Consolidated Statements of Earnings for each of the last three fiscal years (dollars in thousands):
			2014				2013				2012
	Statutory amount		$	189,758			$	231,542			$	207,668
	State taxes, net of the federal		12,750				14,892				13,538
	benefit
	Tax differential on foreign		(8,811		)		(20,253		)		(16,944		)
	earnings
	Uncertain tax positions		(9,847		)		1,553				277
	Other, net		6,204				(6,368		)		(2,157		)
	Consolidated income tax expense		$	190,054			$	221,366			$	202,382
	Rates used to compute statutory		35		%		35		%		35		%
	amount
	Consolidated effective income		35.1		%		33.5		%		34.1		%
	tax rate
Income Tax Payments	'
	The following table presents income tax payments made during each of the last three fiscal years (in millions):
	2014				2013				2012
	$	173.6			$	235.8			$	191.4
Components Of Our Consolidated Earnings Before Taxes	'
	The following table presents the components of our consolidated earnings before taxes for each of the last three fiscal years (in thousands):
			2014				2013				2012
	United States earnings		$	288,800			$	352,404			$	286,987
	Foreign earnings		253,366				309,144				306,349
			$	542,166			$	661,548			$	593,336
Schedule of Unrecognized Tax Benefits Roll Forward	'
	The following table presents the reconciliation of the beginning and ending amount of unrecognized tax benefits for the years presented (in thousands):
			2014				2013				2012
	Balance, beginning of year		$	51,770			$	53,637			$	31,130
	Additions based on tax positions related to the current year		6,528				5,447				6,110
	Additions for tax positions of prior years		—				—				21,438
	Reductions for tax positions of prior years		(16,375		)		(6,354		)		(4,441		)
	Settlement		—				(960		)		(600		)
	Balance, end of year		$	41,923			$	51,770			$	53,637

Commitments_And_Contingencies_1

Commitments And Contingencies, And Derivative Financial Instruments (Tables)	12 Months Ended
	Sep. 26, 2014
Commitments And Contingencies, And Derivative Financial Instruments [Abstract]	'
Commitment Under Operating Leases	'
	We lease certain of our facilities and equipment under operating leases with net aggregate future lease payments of approximately $1.1 billion at September 26, 2014, payable as follows (in thousands):
	In fiscal years,
	2015	$	230,866
	2016	175,877
	2017	153,295
	2018	129,530
	2019	96,865
	Thereafter	308,890
		1,095,323
	Amounts representing sublease income	(19,259		)
	Total, net aggregate future lease payments	$	1,076,064
Rent Expense And Sublease Income	'
	The following table presents rent expense and sublease income offsetting the Company’s rent expense during each of the last three fiscal years (in thousands):
			2014			2013			2012
	Rent expense		$	194,796		$	173,340		$	165,221
	Sublease income		(6,102		)	(7,914		)	(8,402		)
	Net rent		$	188,694		$	165,426		$	156,819
Significant Terms Of The Lease	'
	Significant terms of the lease are as follows:
	End of lease term	2015
	End of term purchase option (in thousands)	$	52,200
	Residual value guaranty (in thousands)	$	38,800

Other_Financial_Information_Ta

Other Financial Information (Tables)	12 Months Ended
	Sep. 26, 2014
Other Financial Information [Abstract]	'
Receivables	'
	The following table presents the components of “Receivables” as shown in the accompanying Consolidated Balance Sheets at September 26, 2014, and September 27, 2013 as well as certain other related information (in thousands):
			2014			2013
	Amounts billed, net		$	1,425,341		$	1,389,278
	Unbilled receivables and other		1,368,482			1,109,931
	Retentions receivable		73,732			49,781
	Total receivables, net		$	2,867,555		$	2,548,990
	Other information about receivables:
	Amounts due from the United States federal		$	324,928		$	292,698
	government included above, net of
	advanced billings
	Claims receivable		$	78,634		$	25,237
Property, Equipment, and Improvements, Net	'
	The following table presents the components of our property, equipment, and improvements, net at September 26, 2014, and September 27, 2013 (in thousands):
			2014			2013
	Land		$	21,497		$	22,027
	Buildings		128,584			131,690
	Equipment		634,415			537,835
	Leasehold improvements		287,814			204,940
	Construction in progress		20,059			22,678
			1,092,369			919,170
	Accumulated depreciation and amortization		(635,572		)	(539,874		)
			$	456,797		$	379,296
Miscellaneous Noncurrent Assets	'
	The following table presents the components of “Miscellaneous noncurrent assets” shown in the accompanying Consolidated Balance Sheets at September 26, 2014, and September 27, 2013 (in thousands):
			2014			2013
	Deferred income taxes		$	170,649		$	197,458
	Cash surrender value of life insurance policies		116,686			100,253
	Investments		226,628			194,782
	Notes receivable		8,007			11,689
	Reimbursable pension costs (a)		77,710			84,348
	Other		38,570			26,025
	Total		$	638,250		$	614,555
	(a)	Consists of costs incurred relating to a defined benefit pension plan covering employees providing services on a contract with, and for the benefit of, the U.S. federal government pursuant to which such costs are fully reimbursable.
Components of Accrued Liabilities	'
	The following table presents the components of “Accrued liabilities” shown in the accompanying Consolidated Balance Sheets at September 26, 2014 and September 27, 2013 (in thousands):
			2014			2013
	Accrued payroll and related liabilities		$	782,615		$	688,391
	Project-related accruals		218,460			115,418
	Insurance liabilities		52,826			48,209
	Sales and other similar taxes		52,373			47,973
	Deferred rent		96,129			57,581
	Other		77,153			72,244
	Total		$	1,279,556		$	1,029,816
Components Of Other Deferred Liabilities	'
	The following table presents the components of “Other deferred liabilities” shown in the accompanying Consolidated Balance Sheets at September 26, 2014 and September 27, 2013 (in thousands):
			2014			2013
	Liabilities relating to defined benefit pension		$	407,263		$	416,707
	and early retirement plans
	Liabilities relating to nonqualified deferred		114,325			101,653
	compensation arrangements
	Deferred income taxes		195,098			142,258
	Miscellaneous		117,392			62,486
	Total		$	834,078		$	723,104
Components Of Total Accumulated Other Comprehensive Loss	'
	The following table presents the components of “Accumulated other comprehensive loss” shown in the accompanying Consolidated Balance Sheets at September 26, 2014, and September 27, 2013 (in thousands):
			2014			2013
	Foreign currency translation adjustments		$	(62,919	)	$	(32,853	)
	Adjustments relating to defined benefit pension plans		(299,210		)	(269,345		)
	Other		(1,420		)	(1,929		)
	Total		$	(363,549	)	$	(304,127	)
Supplemental Cash Flow Information	'
	The following table presents the non-cash adjustments relating to these acquisitions made in preparing the accompanying Consolidated Statements of Cash Flows (in thousands):
			2014			2013
	Working capital		$	48,327		$	4,197
	Property and equipment		59,216			386
	Noncurrent assets		262,450			—
	Deferred liabilities		(7,895		)	2,181
	Non-controlling interests		16,572			18,589
	Foreign currency translation		1,768			(3,461		)
	Goodwill		1,005,923			17,537

Segment_Information_Tables

Segment Information (Tables)	12 Months Ended
	Sep. 26, 2014
Segment Reporting [Abstract]	'
Financial Information By Geographic Area	'
	The following table presents certain financial information by geographic area for fiscal 2014, 2013, and 2012 (in thousands):
			2014			2013		2012
	Revenues:
	United States		$	7,078,366		$	6,993,594	$	6,749,583
	Europe		2,402,399			2,148,504		1,681,421
	Canada		1,344,632			1,652,386		1,564,883
	Asia		299,086			204,203		156,748
	India		148,453			158,908		124,362
	Australia and New Zealand		709,379			141,507		253,932
	South America and Mexico		271,213			241,590		158,141
	Middle East and Africa		441,629			277,684		204,708
	Total		$	12,695,157		$	11,818,376	$	10,893,778
	Long-Lived Assets:
	United States		$	240,501		$	230,281	$	203,746
	Europe		58,562			47,128		46,763
	Canada		51,622			61,122		47,539
	Asia		4,063			4,272		3,580
	India		17,960			15,049		17,094
	Australia		49,436			8,329		7,859
	South America and Mexico		11,084			6,159		2,400
	Middle East and Africa		23,569			6,956		2,150
	Total		$	456,797		$	379,296	$	331,131
Revenues Earned Directly Or Indirectly From The U.S. Federal Government And Its Agencies	'
	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 fiscal 2014, 2013, and 2012:
	2014			2013		2012
	17.8	%		19.9	%	22.1	%

Selected_Quarterly_Information1

Selected Quarterly Information - Unaudited (Tables)	12 Months Ended
	Sep. 26, 2014
Selected Quarterly Financial Information [Abstract]	'
Schedule Of Quarterly Financial Information	'
	The following table presents selected quarterly financial information for each of the last three fiscal years. Amounts are presented in thousands, except for per share amounts:
			First		Second			Third			Fourth			Fiscal
			Quarter		Quarter			Quarter			Quarter			Year
	2014
	Revenues		$	3,068,891	$	3,176,033		$	3,231,791		$	3,218,442		$	12,695,157
	Operating profit (a)		145,047		122,434			123,937			136,650			528,068
	Earnings before taxes		146,921		132,394			118,046			144,805			542,166
	Net earnings of the Group		98,949		90,800			71,309			91,054			352,112
	Net earnings attributable to		93,732		83,460		(d)	64,842		(b)	86,074		(b)	328,108
	Jacobs
	Earnings per share:
	Basic		0.72		0.64		(d)	0.5		(b)	0.66		(b)	2.51
	Diluted		0.71		0.63		(d)	0.49		(b)	0.65		(b)	2.48
	2013
	Revenues		$	2,759,641	$	2,835,084		$	3,080,995		$	3,142,656		$	11,818,376
	Operating profit (a)		160,269		165,203			168,359			175,148			668,979
	Earnings before taxes		156,311		161,908			168,423			174,906			661,548
	Net earnings of the Group		104,523		107,089			112,089			116,481			440,182
	Net earnings attributable to		99,010		104,401			108,871			110,811			423,093
	Jacobs
	Earnings per share:
	Basic		0.77		0.81			0.84			0.85			3.27
	Diluted		0.76		0.8			0.83			0.84			3.23
	2012
	Revenues		$	2,631,768	$	2,702,851		$	2,772,874		$	2,786,285		$	10,893,778
	Operating profit (a)		141,952		133,138			153,366			167,617			596,073
	Earnings before taxes		139,554		132,315			151,371			170,096			593,336
	Net earnings of the Group		91,436		87,446			100,990			111,082			390,954
	Net earnings attributable to		89,710		83,933			97,900			107,411		(c)	378,954		(c)
	Jacobs
	Earnings per share:
	Basic		0.71		0.66			0.77			0.84		(c)	2.97		(c)
	Diluted		0.7		0.65			0.76			0.83		(c)	2.94		(c)
	(a)	Operating profit represents revenues less (i) direct costs of contracts, and (ii) selling, general and administrative expenses.
	(b)	Includes costs of $47.0 million, or $0.35 per diluted share, in the third quarter of fiscal 2014, and $30.4 million, or $0.23 per diluted share, in the fourth quarter of fiscal 2014, related to the Company's restructuring activities.
	(c)	Includes an after-tax gain of $4.0 million, or $0.03 per diluted share, related to the sale of the Company's intellectual property for iron ore pelletizing and certain other related assets.

Description_Of_Business_And_Ba2

Description Of Business And Basis Of Presentation (Details)	12 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Basis of Presentation [Line Items]	'	'	'
Cost-reimbursable	83.00%	85.00%	85.00%
Fixed-price	17.00%	15.00%	15.00%
Minimum	'	'	'
Basis of Presentation [Line Items]	'	'	'
Frequency of fiscal year with an additional week of activity (in years)	'5 years	'	'
Maximum	'	'	'
Basis of Presentation [Line Items]	'	'	'
Frequency of fiscal year with an additional week of activity (in years)	'6 years	'	'

Significant_Accounting_Policie3

Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 26, 2014
	unit
	plans
Significant Accounting Policies [Line Items]	'
Unbilled amounts billed and collected, collection period (in months)	'12 months
Number of reporting units	2
Amortization of intangible assets year one	$52.90
Amortization of intangible assets year two	51.5
Amortization of intangible assets year three	49
Amortization of intangible assets year four	47.5
Amortization of intangible assets year five	46.7
Number of incentive plans (in plans)	2
Minimum | Buildings	'
Significant Accounting Policies [Line Items]	'
Estimated useful life of assets	'20 years
Minimum | Equipment	'
Significant Accounting Policies [Line Items]	'
Estimated useful life of assets	'3 years
Minimum | Leasehold improvements	'
Significant Accounting Policies [Line Items]	'
Estimated useful life of assets	'4 years
Maximum | Buildings	'
Significant Accounting Policies [Line Items]	'
Estimated useful life of assets	'40 years
Maximum | Equipment	'
Significant Accounting Policies [Line Items]	'
Estimated useful life of assets	'10 years
Maximum | Leasehold improvements	'
Significant Accounting Policies [Line Items]	'
Estimated useful life of assets	'10 years
Earned Relative TSR Restricted Stock Units	'
Significant Accounting Policies [Line Items]	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, TSR Performance Multiplier Rule, Determination Period	'3 years
Total stockholder return, beginning stock price, number of calendar days average closing common stock price ending on award date (in days)	'30 days
Total stockholder return, ending stock price, number of calendar days average closing price ending on last day of performance period (in days)	'30 days
Earned Net Earnings Growth Restricted Stock Units	'
Significant Accounting Policies [Line Items]	'
Earned Net Earnings Growth Restricted Stock, vesting period	'3 years
April 1, 2012 to March 31, 2013 | Earned Net Earnings Growth Restricted Stock Units	'
Significant Accounting Policies [Line Items]	'
Earned Net Earnings Growth Restricted Stock, unit basis rule, percent of target RSU	33.33%
April 1, 2012 to March 31, 2014 | Earned Net Earnings Growth Restricted Stock Units	'
Significant Accounting Policies [Line Items]	'
Earned Net Earnings Growth Restricted Stock, unit basis rule, percent of target RSU	66.67%
April 1, 2012 to March 31, 2015 | Earned Net Earnings Growth Restricted Stock Units	'
Significant Accounting Policies [Line Items]	'
Earned Net Earnings Growth Restricted Stock, unit basis rule, percent of target RSU	100.00%
Between 5% and 10% | Earned Net Earnings Growth Restricted Stock Units | Minimum	'
Significant Accounting Policies [Line Items]	'
Earned Net Earnings Growth Restricted Stock, unit basis rule, net earnings average growth threshold percent for multiplier to be determined using straight line Interpolation	5.00%
Between 5% and 10% | Earned Net Earnings Growth Restricted Stock Units | Maximum	'
Significant Accounting Policies [Line Items]	'
Earned Net Earnings Growth Restricted Stock, unit basis rule, net earnings average growth threshold percent for multiplier to be determined using straight line Interpolation	10.00%
Between 10% and 15% | Earned Net Earnings Growth Restricted Stock Units | Minimum	'
Significant Accounting Policies [Line Items]	'
Earned Net Earnings Growth Restricted Stock, unit basis rule, net earnings average growth threshold percent for multiplier to be determined using straight line Interpolation	10.00%
Between 10% and 15% | Earned Net Earnings Growth Restricted Stock Units | Maximum	'
Significant Accounting Policies [Line Items]	'
Earned Net Earnings Growth Restricted Stock, unit basis rule, net earnings average growth threshold percent for multiplier to be determined using straight line Interpolation	15.00%
Between 15% and 20% | Earned Net Earnings Growth Restricted Stock Units | Minimum	'
Significant Accounting Policies [Line Items]	'
Earned Net Earnings Growth Restricted Stock, unit basis rule, net earnings average growth threshold percent for multiplier to be determined using straight line Interpolation	15.00%
Between 15% and 20% | Earned Net Earnings Growth Restricted Stock Units | Maximum	'
Significant Accounting Policies [Line Items]	'
Earned Net Earnings Growth Restricted Stock, unit basis rule, net earnings average growth threshold percent for multiplier to be determined using straight line Interpolation	20.00%
Sinclair Knight Merz	'
Significant Accounting Policies [Line Items]	'
Acquisition-related costs	16.6
Sinclair Knight Merz | Minimum	'
Significant Accounting Policies [Line Items]	'
Intangible assets useful life	'3 years
Sinclair Knight Merz | Maximum	'
Significant Accounting Policies [Line Items]	'
Intangible assets useful life	'12 years
Selling, General and Administrative Expenses | Sinclair Knight Merz	'
Significant Accounting Policies [Line Items]	'
Acquisition-related costs	$9.20

Significant_Accounting_Policie4

Significant Accounting Policies (Pass-Through Costs Included In Revenues) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]	'	'	'
Pass-through costs included in revenues	$2,954.90	$2,624.80	$2,328.40

Significant_Accounting_Policie5

Significant Accounting Policies (Schedule Of Acquired Intangible Assets) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Acquired Finite-Lived Intangible Assets [Roll Forward]	'	'	'
Acquired intangible assets beginning balance	$217,904	$243,762	$259,006
Acquisitions	264,213	0	14,620
Amortization	-46,820	-28,985	-41,934
Foreign currency translation	-1,289	1,850	898
Acquired intangible assets ending balance	440,192	217,904	243,762
Weighted average amortization period (years)	'10 years 1 month	'	'
Customer Relationships, Contracts, and Backlog	'	'	'
Acquired Finite-Lived Intangible Assets [Roll Forward]	'	'	'
Acquired intangible assets beginning balance	195,527	217,729	229,738
Acquisitions	249,164	0	13,010
Foreign currency translation	-1,087	1,471	613
Acquired intangible assets ending balance	408,041	195,527	217,729
Weighted average amortization period (years)	'10 years 2 months 12 days	'	'
Developed Technology	'	'	'
Acquired Finite-Lived Intangible Assets [Roll Forward]	'	'	'
Acquired intangible assets beginning balance	18,911	20,444	21,977
Acquisitions	0	'	'
Foreign currency translation	'	'	'
Acquired intangible assets ending balance	17,378	18,911	20,444
Weighted average amortization period (years)	'12 years	'	'
Trade Names	'	'	'
Acquired Finite-Lived Intangible Assets [Roll Forward]	'	'	'
Acquired intangible assets beginning balance	2,179	3,082	3,473
Acquisitions	15,049	0	1,200
Foreign currency translation	-171	289	161
Acquired intangible assets ending balance	14,148	2,179	3,082
Weighted average amortization period (years)	'4 years 0 months	'	'
Other	'	'	'
Acquired Finite-Lived Intangible Assets [Roll Forward]	'	'	'
Acquired intangible assets beginning balance	1,287	2,507	3,818
Acquisitions	0	0	410
Foreign currency translation	-31	90	124
Acquired intangible assets ending balance	625	1,287	2,507
Weighted average amortization period (years)	'11 years 6 months 19 days	'	'
Excluding Investment in AWE Management Ltd	'	'	'
Acquired Finite-Lived Intangible Assets [Roll Forward]	'	'	'
Amortization	-43,214	-24,008	-28,966
Excluding Investment in AWE Management Ltd | Customer Relationships, Contracts, and Backlog	'	'	'
Acquired Finite-Lived Intangible Assets [Roll Forward]	'	'	'
Amortization	-37,737	-20,731	-24,406
Excluding Investment in AWE Management Ltd | Developed Technology	'	'	'
Acquired Finite-Lived Intangible Assets [Roll Forward]	'	'	'
Amortization	-1,533	-1,533	-1,533
Excluding Investment in AWE Management Ltd | Trade Names	'	'	'
Acquired Finite-Lived Intangible Assets [Roll Forward]	'	'	'
Amortization	-3,251	-614	-1,430
Excluding Investment in AWE Management Ltd | Other	'	'	'
Acquired Finite-Lived Intangible Assets [Roll Forward]	'	'	'
Amortization	($693)	($1,130)	($1,597)

Significant_Accounting_Policie6

Significant Accounting Policies Significant Accounting Policies (Business Combination Table) (Details) (USD $)	Sep. 26, 2014	Sep. 27, 2013	Dec. 13, 2013
In Thousands, unless otherwise specified			Sinclair Knight Merz
Business Acquisition [Line Items]	'	'	'
Cash and cash equivalents	'	'	$152,051
Receivables and other current assets	'	'	367,580
Property and equipment, and other	'	'	71,630
Intangible assets	'	'	202,166
Total assets	'	'	793,427
Current liabilities	'	'	333,298
Deferred tax liability	'	'	70,758
Long-term liabilities	'	'	20,416
Total liabilities	'	'	424,472
Net identifiable assets acquired	'	'	368,955
Goodwill	3,026,349	2,022,831	850,719
Net assets acquired	'	'	$1,219,674

Significant_Accounting_Policie7

Significant Accounting Policies Significant Accounting Policies (Business Combination Narrative) (Details) (USD $)	0 Months Ended	12 Months Ended
	Dec. 13, 2013	Sep. 26, 2014	Sep. 27, 2013
Sinclair Knight Merz	'	'	'
Business Acquisition [Line Items]	'	'	'
Payments to Acquire Business	$1,200,000,000	'	'
Acquisition-related costs	'	16,600,000	'
Acquired receivables	304,600,000	'	'
Adjustment to pro-forma earnings	'	335,658,000	488,434,000
Pro-forma interest expense	'	2,100,000	5,400,000
Pro-forma intangible amortization	'	19,900,000	21,300,000
Loss from settlement related to shareholding plan provisions	'	24,000,000	'
Zamel and Turbag Consulting Engineers Company (ZATE)	'	'	'
Business Acquisition [Line Items]	'	'	'
Additional percentage of ZATE equity acquired	'	15.00%	'
Total percentage ownership of ZATE	'	75.00%	'
Selling, General and Administrative Expenses | Sinclair Knight Merz	'	'	'
Business Acquisition [Line Items]	'	'	'
Acquisition-related costs	'	9,200,000	'
Minimum | Sinclair Knight Merz	'	'	'
Business Acquisition [Line Items]	'	'	'
Intangible assets useful life (duration/period)	'	'3 years	'
Maximum | Sinclair Knight Merz	'	'	'
Business Acquisition [Line Items]	'	'	'
Intangible assets useful life (duration/period)	'	'12 years	'
Acquisition-related Costs | Sinclair Knight Merz	'	'	'
Business Acquisition [Line Items]	'	'	'
Adjustment to pro-forma earnings	'	21,400,000	-21,400,000
Intangible Asset Amortization | Sinclair Knight Merz	'	'	'
Business Acquisition [Line Items]	'	'	'
Adjustment to pro-forma earnings	'	-2,500,000	-16,100,000
Interest Expense | Sinclair Knight Merz	'	'	'
Business Acquisition [Line Items]	'	'	'
Adjustment to pro-forma earnings	'	$2,300,000	($5,400,000)

Significant_Accounting_Policie8

Significant Accounting Policies Significant Accounting Policies (Business Combination Pro Forma) (Details) (Sinclair Knight Merz, USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013
Sinclair Knight Merz	'	'
Business Acquisition [Line Items]	'	'
Revenues	$12,944,848	$13,064,768
Net earnings attributable to Jacobs	$335,658	$488,434
Basic earnings per share	$2.57	$3.78
Diluted earnings per share	$2.54	$3.73

Significant_Accounting_Policie9

Significant Accounting Policies (Stock-based Compensation) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Stock-based compensation expense	$43,400	$39,518	$32,442
Restricted Stock and Restricted Stock Units (excluding Market and Performance Awards)	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Stock-based compensation expense	17,307	12,836	11,021
Stock Options	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Stock-based compensation expense	10,829	11,385	14,067
Market and Performance Awards	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Stock-based compensation expense	$15,264	$15,297	$7,354

Recovered_Sheet1

Significant Accounting Policies (Fair Value Assumptions Of Option Grant Date Award) (Details)	12 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Awards Made to Employees	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Dividend yield (percent)	0.00%	0.00%	0.00%
Expected volatility (percent)	34.25%	38.37%	43.28%
Risk-free interest rate (percent)	1.79%	1.11%	0.95%
Expected term of options (in years)	'5 years 9 months 26 days	'5 years 9 months 26 days	'5 years 9 months 26 days
Awards Made to Directors	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Dividend yield (percent)	0.00%	0.00%	0.00%
Expected volatility (percent)	35.30%	37.65%	41.42%
Risk-free interest rate (percent)	1.76%	0.95%	1.11%
Expected term of options (in years)	'5 years 9 months 26 days	'5 years 9 months 26 days	'5 years 9 months 26 days

Recovered_Sheet2

Significant Accounting Policies (Basis to Determine Earned Relative TSR Restricted Stock Units) (Details) (Earned Relative TSR Restricted Stock Units)	12 Months Ended
	Sep. 26, 2014
Below 30th percentile	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
TSR performance multiplier (percent)	0.00%
30th percentile	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
TSR performance multiplier (percent)	50.00%
50th percentile	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
TSR performance multiplier (percent)	100.00%
70th percentile or above	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
TSR performance multiplier (percent)	150.00%

Recovered_Sheet3

Significant Accounting Policies (Fair Value Assumptions of Earned Relative TSR Restricted Stock Units) (Details) (Earned Relative TSR Restricted Stock Units)	12 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Earned Relative TSR Restricted Stock Units	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Dividend yield (percent)	0.00%	0.00%	0.00%
Expected volatility (percent)	24.77%	29.18%	36.30%
Risk-free interest rate (percent)	0.80%	0.42%	0.42%
Expected term (in years)	'3 years	'3 years	'3 years

Recovered_Sheet4

Significant Accounting Policies (Basis to Determine Earned Net Earnings Growth Restricted Stock Units) (Details) (Net Earnings Growth Performance Multiplier)	12 Months Ended
	Sep. 26, 2014
Less than 5%	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Net earnings growth performance multiplier (percent)	0.00%
5%	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Net earnings growth performance multiplier (percent)	50.00%
10%	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Net earnings growth performance multiplier (percent)	100.00%
15%	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Net earnings growth performance multiplier (percent)	150.00%
20%	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Net earnings growth performance multiplier (percent)	200.00%

Stock_Purchase_And_Stock_Optio2

Stock Purchase And Stock Option Plans (Stock Issuance Activity Under The 1989 ESPP And The GESPP) (Details) (USD $)	12 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Discount (percent) available to employees on the purchase of common stock	5.00%	'	'
Aggregate Purchase Price Paid for Shares Sold	$33,668,769	$33,081,426	$35,181,647
Aggregate Number of Shares Sold	613,084	707,638	930,179
Shares reserved for future Issuance (in shares)	11,429,944	'	'
Under the 1989 ESPP	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Aggregate Purchase Price Paid for Shares Sold	30,354,723	30,012,848	32,236,660
Aggregate Number of Shares Sold	553,201	642,675	853,819
Shares reserved for future Issuance (in shares)	1,860,820	'	'
Under the GESPP	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Aggregate Purchase Price Paid for Shares Sold	$3,314,046	$3,068,578	$2,944,987
Aggregate Number of Shares Sold	59,883	64,963	76,360
Shares reserved for future Issuance (in shares)	212,185	'	'

Stock_Purchase_And_Stock_Optio3

Stock Purchase And Stock Option Plans (Stock Purchase And Stock Option Plans Information On The 1999 Plans) (Details)	Sep. 26, 2014	Sep. 27, 2013	Sep. 26, 2014	Sep. 27, 2013	Sep. 26, 2014	Sep. 27, 2013	Sep. 26, 2014	Sep. 26, 2014	Sep. 26, 2014
			1999 SIP	1999 SIP	1999 ODSP	1999 ODSP	Stock Appreciation Rights (SARs)	Stock Options	Restricted Stock
							1999 SIP	1999 SIP	1999 SIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'	'	'	'	'
Number of shares authorized	30,650,000	'	29,850,000	'	800,000	'	'	'	'
Number of remaining shares reserved for issuance at September 26, 2014	11,429,944	'	11,072,944	'	357,000	'	'	'	'
Number of shares relating to outstanding stock options at September 26, 2014	4,221,147	'	3,954,272	'	266,875	'	'	'	'
Number of shares available for future awards (in shares)	7,208,797	5,239,757	7,118,672	5,099,632	90,125	140,125	'	'	'
Award number of shares, fungible share basis (in shares)	'	'	'	'	'	'	1	1	1.92

Stock_Purchase_And_Stock_Optio4

Stock Purchase And Stock Option Plans (Fair Value Of Shares Vested) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Fair value of shares vested	$25,495	$13,054	$7,955
Service Condition | Restricted Stock Units (RSUs)	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Fair value of shares vested	6,820	13,054	7,955
Service, Market, And Performance Conditions | Restricted Stock Units (RSUs)	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Fair value of shares vested	$18,675	$0	$0

Stock_Purchase_And_Stock_Optio5

Stock Purchase And Stock Option Plans (Total Pre-Tax Compensation Cost Relating To Share-Based Payments Included In The Accompanying Consolidated Statements Of Earnings) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'	'	'
Share-based compensation expense (pre-tax)	$43,400	$39,518	$32,442

Stock_Purchase_And_Stock_Optio6

Stock Purchase And Stock Option Plans (Stock Option Activity Under The 1999 Plans And The 1981 Plan) (Details) (USD $)	12 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012	Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]	'	'	'	'
Number of stock options outstanding, beginning balance (in shares)	4,606,212	5,756,734	6,461,510	'
Number of stock options granted (in shares)	602,525	753,450	658,700	'
Number of stock options exercised (in shares)	-718,065	-1,782,371	-1,281,449	'
Number of stock options cancelled or expired (in shares)	-269,525	-121,601	-82,027	'
Number of stock options outstanding, ending balance (in shares)	4,221,147	4,606,212	5,756,734	'
Options outstanding weighted average price (in dollars per share)	$53.23	$52.33	$47.23	$43.28
Weighted average exercise price options granted (in dollars per share)	$53.51	$54.71	$37.45	'
Weighted average exercise price options exercised (in dollars per share)	$47.18	$37	$22.54	'
Weighted average exercise price options cancelled or expired (in dollars per share)	$54.46	$50.22	$43.92	'

Stock_Purchase_And_Stock_Optio7

Stock Purchase And Stock Option Plans (Total Intrinsic Value Of Options Exercised) (Details) (USD $)	12 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'	'	'
Intrinsic value of stock options exercised	$9,590,000	$22,163,000	$26,196,000
Intrinsic value of options exercisable	$30,500,000	'	'

Stock_Purchase_And_Stock_Optio8

Stock Purchase And Stock Option Plans (Information Regarding Stock Option Plans) (Details) (USD $)	12 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
At fiscal year end:	'	'	'
Range of exercise prices for options outstanding, minimum (in dollars per share)	$25.87	$20.98	$18.49
Range of exercise prices for options outstanding, maximum (in dollars per share)	$94.11	$94.11	$94.11
Number of options exercisable (in shares)	2,725,980	3,034,111	4,219,557
For the fiscal year:	'	'	'
Range of prices relating to options exercised, minimum (in dollars per share)	$20.98	$18.49	$13.29
Range of prices relating to options exercised, maximum (in dollars per share)	$57.54	$56.95	$37.73
Estimated weighted average fair values of options granted (in dollars per share)	$19.04	$20.64	$15.55

Stock_Purchase_And_Stock_Optio9

Stock Purchase And Stock Option Plans (Information Regarding Options Outstanding, And Options Exercisable) (Details) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012	Sep. 30, 2011
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'	'	'
Range of exercise prices, minimum (in dollars per share)	$25.87	$20.98	$18.49	'
Range of exercise prices, maximum (in dollars per share)	$94.11	$94.11	$94.11	'
Options outstanding number (in shares)	4,221,147	4,606,212	5,756,734	6,461,510
Options outstanding weighted average remaining contractual life (in years)	'6 years 1 month 2 days	'	'	'
Options outstanding weighted average price (in dollars per share)	$53.23	$52.33	$47.23	$43.28
Options exercisable (in shares)	2,725,980	'	'	'
Options exercisable weighted average exercise price (in dollars per share)	$0	'	'	'
Ownership duration of common stock for incentive plan participants for exercise price of stock options, minimum (in months)	'6 months	'	'	'
Nonvested not yet recognized	$146	'	'	'
Options exercisable, weighted average remaining contractual term (in years)	'4 years 7 months 5 days	'	'	'
$25.87 - $26.80	'	'	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'	'	'
Range of exercise prices, minimum (in dollars per share)	$25.87	'	'	'
Range of exercise prices, maximum (in dollars per share)	$26.80	'	'	'
Options outstanding number (in shares)	21,500	'	'	'
Options outstanding weighted average remaining contractual life (in years)	'0 years 5 months 8 days	'	'	'
Options outstanding weighted average price (in dollars per share)	$26.73	'	'	'
Options exercisable (in shares)	21,500	'	'	'
Options exercisable weighted average exercise price (in dollars per share)	$26.73	'	'	'
$32.51 - $37.32	'	'	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'	'	'
Range of exercise prices, minimum (in dollars per share)	$32.51	'	'	'
Range of exercise prices, maximum (in dollars per share)	$37.32	'	'	'
Options outstanding number (in shares)	531,375	'	'	'
Options outstanding weighted average remaining contractual life (in years)	'7 years 6 months 18 days	'	'	'
Options outstanding weighted average price (in dollars per share)	$37.01	'	'	'
Options exercisable (in shares)	269,625	'	'	'
Options exercisable weighted average exercise price (in dollars per share)	$37	'	'	'
$37.43 - $46.37	'	'	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'	'	'
Range of exercise prices, minimum (in dollars per share)	$37.43	'	'	'
Range of exercise prices, maximum (in dollars per share)	$46.37	'	'	'
Options outstanding number (in shares)	1,460,412	'	'	'
Options outstanding weighted average remaining contractual life (in years)	'5 years 5 months 8 days	'	'	'
Options outstanding weighted average price (in dollars per share)	$42.39	'	'	'
Options exercisable (in shares)	1,363,037	'	'	'
Options exercisable weighted average exercise price (in dollars per share)	$42.30	'	'	'
$47.11 - $55.04	'	'	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'	'	'
Range of exercise prices, minimum (in dollars per share)	$47.11	'	'	'
Range of exercise prices, maximum (in dollars per share)	$55.04	'	'	'
Options outstanding number (in shares)	1,453,911	'	'	'
Options outstanding weighted average remaining contractual life (in years)	'8 years 6 months 10 days	'	'	'
Options outstanding weighted average price (in dollars per share)	$52.99	'	'	'
Options exercisable (in shares)	397,644	'	'	'
Options exercisable weighted average exercise price (in dollars per share)	$51.02	'	'	'
$55.13 - $57.81	'	'	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'	'	'
Range of exercise prices, minimum (in dollars per share)	$55.13	'	'	'
Range of exercise prices, maximum (in dollars per share)	$57.81	'	'	'
Options outstanding number (in shares)	17,000	'	'	'
Options outstanding weighted average remaining contractual life (in years)	'5 years 0 months 14 days	'	'	'
Options outstanding weighted average price (in dollars per share)	$56.51	'	'	'
Options exercisable (in shares)	10,250	'	'	'
Options exercisable weighted average exercise price (in dollars per share)	$57.27	'	'	'
$60.08 - $83.61	'	'	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'	'	'
Range of exercise prices, minimum (in dollars per share)	$60.08	'	'	'
Range of exercise prices, maximum (in dollars per share)	$83.61	'	'	'
Options outstanding number (in shares)	165,075	'	'	'
Options outstanding weighted average remaining contractual life (in years)	'5 years 3 months 21 days	'	'	'
Options outstanding weighted average price (in dollars per share)	$70.40	'	'	'
Options exercisable (in shares)	92,050	'	'	'
Options exercisable weighted average exercise price (in dollars per share)	$78.42	'	'	'
$88.19 - $94.11	'	'	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'	'	'
Range of exercise prices, minimum (in dollars per share)	$88.19	'	'	'
Range of exercise prices, maximum (in dollars per share)	$94.11	'	'	'
Options outstanding number (in shares)	571,874	'	'	'
Options outstanding weighted average remaining contractual life (in years)	'0 years 7 months 20 days	'	'	'
Options outstanding weighted average price (in dollars per share)	$92.57	'	'	'
Options exercisable (in shares)	571,874	'	'	'
Options exercisable weighted average exercise price (in dollars per share)	$92.57	'	'	'

Recovered_Sheet5

Stock Purchase And Stock Option Plans (Number Of Shares Of Restricted Stock And Restricted Stock Units Issued Under The 1999 Plans) (Details)	3 Months Ended	12 Months Ended
	Sep. 28, 2012	Sep. 26, 2014		Sep. 27, 2013		Sep. 28, 2012
Stock Option Plans 1999 ODSP	'	'		'		'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'		'		'
Share-based Compensation Arrangement by Share-based Payment Award, Award Number of Shares, Non-Fungible Share Basis	1	'		'		'
Stock Option Plans 1999 ODSP | Restricted stock, non fungible	'	'		'		'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'		'		'
Restricted stock and restricted stock units outstanding	'	40,000		'		'
Stock Option Plans 1999 ODSP | Service Condition	'	'		'		'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'		'		'
Restricted stock and restricted stock units issued	'	15,000		13,500		8,000
Stock Option Plans 1999 ODSP | Service Condition | Restricted stock units, non fungible	'	'		'		'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'		'		'
Restricted stock and restricted stock units outstanding	'	62,500		'		'
Stock Option Plans 1999 SIP | Restricted stock, non fungible	'	'		'		'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'		'		'
Restricted stock and restricted stock units outstanding	'	929,990		'		'
Stock Option Plans 1999 SIP | Restricted stock, fungible	'	'		'		'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'		'		'
Restricted stock and restricted stock units outstanding	'	985,400		'		'
Stock Option Plans 1999 SIP | Restricted Stock	'	'		'		'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'		'		'
Share-based Compensation Arrangement by Share-based Payment Award, Award Number of Shares, Non-Fungible Share Basis	1	'		'		'
Restricted stock and restricted stock units issued	'	589,150	[1]	445,200	[1]	497,100
Restricted stock and restricted stock units cancelled	'	147,221	[1],[2]	128,923	[1],[2]	80,460
Award number of shares, fungible share basis (in shares)	'	1.92		'		'
Restricted stock and restricted stock units outstanding	'	1,915,390		'		'
Stock Option Plans 1999 SIP | Restricted Stock Units (RSUs)	'	'		'		'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'		'		'
Share-based Compensation Arrangement by Share-based Payment Award, Award Number of Shares, Non-Fungible Share Basis	1	'		'		'
Award number of shares, fungible share basis (in shares)	'	1.92		'		'
Stock Option Plans 1999 SIP | Service Condition | Restricted stock units, non fungible	'	'		'		'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'		'		'
Restricted stock and restricted stock units outstanding	'	103,920		'		'
Stock Option Plans 1999 SIP | Service Condition | Restricted stock units, fungible	'	'		'		'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'		'		'
Restricted stock and restricted stock units outstanding	'	384,995		'		'
Stock Option Plans 1999 SIP | Service Condition | Restricted Stock Units (RSUs)	'	'		'		'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'		'		'
Restricted stock and restricted stock units issued	'	287,545	[1]	107,500	[1]	116,450
Restricted stock and restricted stock units cancelled	'	12,333	[1],[2]	3,385	[1],[2]	5,650
Restricted stock and restricted stock units outstanding	'	488,915		'		'
Stock Option Plans 1999 SIP | Service, Market, And Performance Conditions | Restricted stock units, non fungible	'	'		'		'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'		'		'
Restricted stock and restricted stock units outstanding	'	475,000		'		'
Stock Option Plans 1999 SIP | Service, Market, And Performance Conditions | Restricted stock units, fungible	'	'		'		'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'		'		'
Restricted stock and restricted stock units outstanding	'	871,950		'		'
Stock Option Plans 1999 SIP | Service, Market, And Performance Conditions | Restricted Stock Units (RSUs)	'	'		'		'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'		'		'
Restricted stock and restricted stock units issued	'	432,700	[1]	471,250	[1]	525,000
Restricted stock and restricted stock units cancelled	'	52,000	[1],[2]	32,000	[1],[2]	22,000
Restricted stock and restricted stock units outstanding	'	1,346,950		'		'
[1]	The share amounts in the above tables for fiscal 2013 and 2014 reflect the fungible share counting of 1.92 shares for each share of restricted stock and restricted stock unit issued.
[2]	Commencing in fiscal 2013, shares withheld for withholding tax liabilities are available for awards under the 1999 SIP and have been included in the table above for fiscal 2013 and 2014 only.

Earnings_Per_Share_Earnings_Pe

Earnings Per Share (Earnings Per Share) (Details) (USD $)	0 Months Ended		12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Aug. 19, 2014		Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012	Aug. 19, 2014
Shares used to calculate EPS:	'		'	'	'	'
Weighted average shares outstanding (denominator used to compute basic EPS)	'		130,483	129,288	127,644	'
Effect of stock options and restricted stock	'		1,888	1,657	1,048	'
Denominator used to compute diluted EPS	'		132,371	130,945	128,692	'
Antidilutive stock options, shares of restricted stock, and restricted stock units	'		2,074	2,603	5,093	'
Amount authorized to be repurchased	'		'	'	'	$500,000
Average cost per share repurchased	$52.27	[1]	'	'	'	'
Number of shares repurchased	1,500		'	'	'	'
[1]	Includes commissions paid and calculated as the average price per share since the repurchaseprogram authorization date.

Borrowings_Narrative_Details

Borrowings (Narrative) (Details) (USD $)

12 Months Ended

12 Months Ended

Sep. 26, 2014

Sep. 26, 2014

Sep. 26, 2014

Sep. 26, 2014

Sep. 26, 2014

Sep. 26, 2014

Sep. 26, 2014

Sep. 26, 2014

Sep. 26, 2014

Sep. 26, 2014

Feb. 07, 2014

Sep. 26, 2014

Sep. 26, 2014

Feb. 07, 2014

Sep. 26, 2014

Sep. 26, 2014

Sep. 27, 2013

Sep. 26, 2014

Sep. 27, 2013

Sep. 26, 2014

tranche

Minimum

Maximum

Eurocurrency Interest Rate

Eurocurrency Interest Rate

Letter of Credit

Standby Letters of Credit

Base Interest Rate

Base Interest Rate

Subfacility of Swingline Loans

2012 Facility

Revolving Credit Facility, One Billion Six Hundred Million

Revolving Credit Facility, One Billion Six Hundred Million

Revolving Credit Facility, One Billion Six Hundred Million

Revolving Credit Facility, One Billion Six Hundred Million

Line of Credit

Line of Credit

Other Loan Agreements

Other Loan Agreements

Bank Overdrafts

Minimum

Maximum

Minimum

Maximum

Revolving Credit Facility

Revolving Credit Facility

Revolving Credit Facility

Letter of Credit

2012 Facility

2012 Facility

Revolving Credit Facility

Revolving Credit Facility

Line of Credit Facility [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Overdrafts outstanding

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$36,700,000

'

'

Short-term debt interest rate (percent)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

6.40%

Short-term Debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

22,800,000

'

Maximum borrowing capacity

'

'

'

'

'

300,000,000

'

'

'

50,000,000

1,205,000,000

'

'

1,600,000,000

'

'

'

'

'

'

Potential borrwing capcity of accordion feature

'

'

'

'

'

'

'

'

'

'

'

'

'

2,100,000,000

'

'

'

'

'

'

Amount outstanding/issued - credit facility

'

'

'

'

'

'

'

'

'

'

'

'

-800,000,000

'

-2,800,000

-764,075,000

-415,086,000

'

'

'

Current available borrowing capacity

'

'

'

'

'

'

'

'

'

'

'

800,000,000

'

'

'

'

'

'

'

'

Amount outstanding/issued - letters of credit

$315,400,000

'

'

'

'

'

$312,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of tranches in revolving credit facility

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Basis spread on variable rate (percent)

'

'

'

1.00%

1.50%

'

'

0.00%

0.50%

'

'

'

'

'

'

'

'

'

'

'

Facility fee (percent)

'

0.10%

0.25%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Borrowings_Schedule_Of_LongTer

Borrowings (Schedule Of Long-Term Revolving Credit Facility) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013
Long-term Debt	$764,075	$415,086
2012 Facility | Line of Credit | Revolving Credit Facility	'	'
Line of credit facility, amount outstanding	$764,075	$415,086
Range of interest rates, minimum	1.00%	0.96%
Range of interest rates, maximum	1.51%	1.37%

Borrowings_Schedule_Of_Additio

Borrowings (Schedule Of Additional Informational 2012 Facility) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013
Debt Disclosure [Abstract]	'	'
Maximum amount outstanding at any month-end during the fiscal year	$1,036,066	$526,602
Average amount outstanding during the year	$866,264	$470,343
Weighted average interest rate during the year	1.18%	1.11%

Borrowings_Schedule_Of_Interes

Borrowings (Schedule Of Interest Paid) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Debt Disclosure [Abstract]	'	'	'
Interest paid	$13,841	$6,685	$8,572

Pension_Plans_Narrative_Detail

Pension Plans (Narrative) (Details) (U.S. Pension Plans, USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 26, 2014	Sep. 26, 2014	Sep. 27, 2013
		Other Noncurrent Assets	Other Noncurrent Assets
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Period of annual average returns used in return on plan assets simulation model (in years)	'20 years	'	'
Government Contract Receivable	'	$61.10	$58.40

Pension_Plans_Schedule_Of_Chan

Pension Plans (Schedule Of Change In Plans' Combined Net Benefit Obligation) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
U.S. Pension Plans	'	'	'
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]	'	'	'
Net benefit obligation at the beginning of the year	$468,439	$509,605	'
Service cost	12,077	13,814	12,838
Interest cost	22,041	18,569	20,923
Participants’ contributions	3,095	3,071	'
Actuarial (gains)/losses	27,076	-42,689	'
Benefits paid	-35,634	-33,960	'
Curtailments and settlements	'	'	'
Plan amendments	-1,306	'	'
Special termination benefits	'	29	'
Effect of exchange rate changes	'	'	'
Net benefit obligation at the end of the year	495,788	468,439	509,605
Non-U.S. Pension Plans	'	'	'
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]	'	'	'
Net benefit obligation at the beginning of the year	1,307,331	1,191,345	'
Service cost	25,374	30,117	22,723
Interest cost	54,208	51,331	54,287
Participants’ contributions	9,082	11,805	'
Actuarial (gains)/losses	105,838	57,764	'
Benefits paid	-33,387	-34,058	'
Curtailments and settlements	-269,580	-6,297	'
Plan amendments	'	109	'
Special termination benefits	'	'	'
Effect of exchange rate changes	-2,346	5,215	'
Net benefit obligation at the end of the year	$1,196,520	$1,307,331	$1,191,345

Pension_Plans_Schedule_Of_Chan1

Pension Plans (Schedule Of Change In Combined Fair Value Of The Plans' Assets) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013
U.S. Pension Plans	'	'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'
Fair Value of plan assets at the beginning of the year	$390,777	$359,348
Actual return on plan assets	45,484	53,495
Employer contributions	11,628	8,823
Participants’ contributions	3,095	3,071
Gross benefits paid	-35,634	-33,960
Business combinations/consolidations	'	'
Curtailments/settlements	'	'
Effect of exchange rate changes	'	'
Fair Value of plan assets at the end of the year	415,350	390,777
Non-U.S. Pension Plans	'	'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'
Fair Value of plan assets at the beginning of the year	982,479	877,950
Actual return on plan assets	130,665	72,368
Employer contributions	57,977	53,885
Participants’ contributions	9,082	11,805
Gross benefits paid	-33,387	-34,058
Business combinations/consolidations	0	'
Curtailments/settlements	-268,486	-4,973
Effect of exchange rate changes	-2,159	5,502
Fair Value of plan assets at the end of the year	$876,171	$982,479

Pension_Plans_Reconciliation_O

Pension Plans (Reconciliation Of Combined Funded Status Of Plans And Recognized In Consolidated Balance Sheet) (Details) (USD $)	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
In Thousands, unless otherwise specified
U.S. Pension Plans	'	'	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'	'
Net benefit obligation at the end of the year	$495,788	$468,439	$509,605
Fair Value of plan assets at the end of the year	415,350	390,777	359,348
Under-funded amount recognized at the end of the year	80,438	77,662	'
Non-U.S. Pension Plans	'	'	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'	'
Net benefit obligation at the end of the year	1,196,520	1,307,331	1,191,345
Fair Value of plan assets at the end of the year	876,171	982,479	877,950
Under-funded amount recognized at the end of the year	$320,349	$324,852	'

Pension_Plans_Accumulated_Bene

Pension Plans (Accumulated Benefit Obligation) (Details) (USD $)	Sep. 26, 2014	Sep. 27, 2013
In Thousands, unless otherwise specified
U.S. Pension Plans	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Accumulated benefit obligation at the end of the year	$455,245	$431,726
Non-U.S. Pension Plans	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Accumulated benefit obligation at the end of the year	$1,128,715	$1,222,234

Pension_Plans_Schedule_Of_Amou

Pension Plans (Schedule Of Amount Recognized In Accompanying Balance Sheets) (Details) (USD $)	Sep. 26, 2014	Sep. 27, 2013
In Thousands, unless otherwise specified
U.S. Pension Plans	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Prepaid benefit cost included in prepaid assets	$0	$0
Accrued benefit cost included in current liabilities	0	0
Accrued benefit cost included in noncurrent liabilities	80,438	77,662
Net amount recognized at the end of the year	80,438	77,662
Non-U.S. Pension Plans	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Prepaid benefit cost included in prepaid assets	7,123	15,193
Accrued benefit cost included in current liabilities	1,447	1,000
Accrued benefit cost included in noncurrent liabilities	326,025	339,045
Net amount recognized at the end of the year	$320,349	$324,852

Pension_Plans_Schedule_Of_Sign

Pension Plans (Schedule Of Significant Actuarial Assumptions In Determining The Funded Status and Benefit Cost) (Details)	12 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
U.S. Pension Plans	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Rates of compensation increases	2.95%	2.80%	3.25%
Expected long-term rates of return on plan assets	7.70%	7.70%	7.50%
U.S. Pension Plans | Maximum	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Weighted average discount rates	4.40%	5.00%	3.90%
U.S. Pension Plans | Minimum	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Weighted average discount rates	3.90%	4.40%	3.40%
Non-U.S. Pension Plans | Maximum	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Weighted average discount rates	8.80%	9.30%	8.40%
Rates of compensation increases	7.50%	7.50%	7.50%
Expected long-term rates of return on plan assets	8.50%	8.50%	8.50%
Non-U.S. Pension Plans | Minimum	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Weighted average discount rates	1.80%	0.40%	0.60%
Rates of compensation increases	2.60%	2.50%	2.80%
Expected long-term rates of return on plan assets	4.50%	0.40%	2.40%

Pension_Plans_Schedule_Of_Pens

Pension Plans (Schedule Of Pension Plans Recognized In Accumulated Other Comprehensive Loss) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Reclassification adjustments:	'	'	'
Total	$29,865	($547)	$75,942
U.S. Pension Plans	'	'	'
Arising during the period:	'	'	'
Net actuarial (gain) loss	1,378	-15,850	2,756
Reclassification adjustments:	'	'	'
Net actuarial gain	-2,255	-2,674	-2,011
Total	-877	-18,524	745
Non-U.S. Pension Plans	'	'	'
Arising during the period:	'	'	'
Net actuarial (gain) loss	48,752	27,417	83,298
Prior service cost (benefit)	-1	297	-1,947
Total	48,751	27,714	81,351
Reclassification adjustments:	'	'	'
Net actuarial gain	-12,914	-9,778	-6,131
Prior service cost (benefit)	-19	41	-23
Total	-12,933	-9,737	-6,154
Total	$35,818	$17,977	$75,197

Pension_Plans_Schedule_Of_Pens1

Pension Plans (Schedule Of Pension Plans Recorded In Accumulated Other Comprehensive Loss Not Yet Recognized As Component Of Net Periodic Pension Cost) (Details) (USD $)	Sep. 26, 2014	Sep. 27, 2013
In Thousands, unless otherwise specified
U.S. Pension Plans	'	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'
Net actuarial loss	$49,569	$50,446
Prior service cost	'	'
Total	49,569	50,446
Non-U.S. Pension Plans	'	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'
Net actuarial loss	263,913	228,074
Prior service cost	-487	-466
Total	$263,426	$227,608

Pension_Plans_Schedule_Of_Accu

Pension Plans (Schedule Of Accumulated Comprehensive Income Amortized Against Earnings In The Next Year) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 26, 2014
U.S. Pension Plans	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'
Unrecognized net actuarial loss	$3,756
Unrecognized prior service cost	-239
Accumulated comprehensive loss to be recorded against earnings	3,517
Non-U.S. Pension Plans	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'
Unrecognized net actuarial loss	18,505
Unrecognized prior service cost	-99
Accumulated comprehensive loss to be recorded against earnings	$18,406

Pension_Plans_Schedule_Of_Weig

Pension Plans (Schedule Of Weighted Average Measurement Of Assets And Liabilities) (Details)	Sep. 26, 2014	Sep. 27, 2013
Equity securities | U.S. Pension Plans	'	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'
Pension plan asset allocations	75.00%	74.00%
Equity securities | Non-U.S. Pension Plans	'	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'
Pension plan asset allocations	29.00%	32.00%
Debt securities | U.S. Pension Plans	'	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'
Pension plan asset allocations	21.00%	20.00%
Debt securities | Non-U.S. Pension Plans	'	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'
Pension plan asset allocations	32.00%	31.00%
Real estate investments | U.S. Pension Plans	'	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'
Pension plan asset allocations	0.00%	1.00%
Real estate investments | Non-U.S. Pension Plans	'	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'
Pension plan asset allocations	7.00%	6.00%
Other | U.S. Pension Plans	'	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'
Pension plan asset allocations	4.00%	5.00%
Other | Non-U.S. Pension Plans	'	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'
Pension plan asset allocations	32.00%	31.00%

Pension_Plans_Schedule_Of_Fair

Pension Plans (Schedule Of Fair Value Of Pension Plan Assets) (Details) (USD $)	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
In Thousands, unless otherwise specified
U.S. Pension Plans	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	$415,350	$390,777	$359,348
U.S. Pension Plans | Level 1	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	399,046	370,855	'
U.S. Pension Plans | Level 3	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	16,304	19,922	'
U.S. Pension Plans | Domestic equities	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	268,674	247,155	'
U.S. Pension Plans | Domestic equities | Level 1	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	268,674	247,155	'
U.S. Pension Plans | Domestic equities | Level 3	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
U.S. Pension Plans | Overseas equities	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	40,587	40,719	'
U.S. Pension Plans | Overseas equities | Level 1	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	40,587	40,719	'
U.S. Pension Plans | Overseas equities | Level 3	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
U.S. Pension Plans | Domestic bonds	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	85,853	79,482	'
U.S. Pension Plans | Domestic bonds | Level 1	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	85,853	79,482	'
U.S. Pension Plans | Domestic bonds | Level 3	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
U.S. Pension Plans | Cash and equivalents	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	3,932	3,499	'
U.S. Pension Plans | Cash and equivalents | Level 1	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	3,932	3,499	'
U.S. Pension Plans | Cash and equivalents | Level 3	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
U.S. Pension Plans | Real estate	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	0	4,411	'
U.S. Pension Plans | Real estate | Level 1	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
U.S. Pension Plans | Real estate | Level 3	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	0	4,411	4,841
U.S. Pension Plans | Hedge funds	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	16,304	15,511	'
U.S. Pension Plans | Hedge funds | Level 1	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
U.S. Pension Plans | Hedge funds | Level 3	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	16,304	15,511	14,471
Non-U.S. Pension Plans	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	876,171	982,479	877,950
Non-U.S. Pension Plans | Level 1	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	564,801	650,627	'
Non-U.S. Pension Plans | Level 3	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	311,370	331,852	'
Non-U.S. Pension Plans | Domestic equities	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	33,842	108,261	'
Non-U.S. Pension Plans | Domestic equities | Level 1	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	33,842	108,261	'
Non-U.S. Pension Plans | Domestic equities | Level 3	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Non-U.S. Pension Plans | Overseas equities	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	218,779	207,607	'
Non-U.S. Pension Plans | Overseas equities | Level 1	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	218,779	207,607	'
Non-U.S. Pension Plans | Overseas equities | Level 3	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Non-U.S. Pension Plans | Domestic bonds	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	198,344	230,202	'
Non-U.S. Pension Plans | Domestic bonds | Level 1	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	198,344	230,202	'
Non-U.S. Pension Plans | Domestic bonds | Level 3	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Non-U.S. Pension Plans | Overseas bonds	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	76,349	76,372	'
Non-U.S. Pension Plans | Overseas bonds | Level 1	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	76,349	76,372	'
Non-U.S. Pension Plans | Overseas bonds | Level 3	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Non-U.S. Pension Plans | Cash and equivalents	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	37,487	28,185	'
Non-U.S. Pension Plans | Cash and equivalents | Level 1	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	37,487	28,185	'
Non-U.S. Pension Plans | Cash and equivalents | Level 3	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Non-U.S. Pension Plans | Infrastructure / raw goods	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	7,076	'
Non-U.S. Pension Plans | Infrastructure / raw goods | Level 1	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Non-U.S. Pension Plans | Infrastructure / raw goods | Level 3	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	0	7,076	6,111
Non-U.S. Pension Plans | Real estate	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	59,966	57,173	'
Non-U.S. Pension Plans | Real estate | Level 1	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Non-U.S. Pension Plans | Real estate | Level 3	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	59,966	57,173	49,537
Non-U.S. Pension Plans | Insurance contracts	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	37,468	21,214	'
Non-U.S. Pension Plans | Insurance contracts | Level 1	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Non-U.S. Pension Plans | Insurance contracts | Level 3	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	37,468	21,214	18,291
Non-U.S. Pension Plans | Hedge funds	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	213,936	246,389	'
Non-U.S. Pension Plans | Hedge funds | Level 1	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Non-U.S. Pension Plans | Hedge funds | Level 3	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	$213,936	$246,389	$93,400

Pension_Plans_Summary_Of_Chang

Pension Plans (Summary Of Changes In The Fair Value Of The Plans' Level 3 Assets) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013
U.S. Pension Plans	'	'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'
Fair Value of plan assets at the beginning of the year	$390,777	$359,348
Effect of exchange rate changes	'	'
Fair Value of plan assets at the end of the year	415,350	390,777
U.S. Pension Plans | Real estate	'	'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'
Fair Value of plan assets at the end of the year	0	4,411
U.S. Pension Plans | Hedge funds	'	'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'
Fair Value of plan assets at the end of the year	16,304	15,511
U.S. Pension Plans | Significant Unobservable Inputs (Level 3)	'	'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'
Fair Value of plan assets at the end of the year	16,304	19,922
U.S. Pension Plans | Significant Unobservable Inputs (Level 3) | Real estate	'	'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'
Fair Value of plan assets at the beginning of the year	4,411	4,841
Sale	-4,411	0
Realized and unrealized gains (losses)	0	-430
Fair Value of plan assets at the end of the year	0	4,411
U.S. Pension Plans | Significant Unobservable Inputs (Level 3) | 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	15,511	14,471
Sale	0	0
Realized and unrealized gains (losses)	793	1,040
Fair Value of plan assets at the end of the year	16,304	15,511
Non-U.S. Pension Plans	'	'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'
Fair Value of plan assets at the beginning of the year	982,479	877,950
Effect of exchange rate changes	-2,159	5,502
Fair Value of plan assets at the end of the year	876,171	982,479
Non-U.S. Pension Plans | Infrastructure \ Raw Goods	'	'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'
Fair Value of plan assets at the end of the year	'	7,076
Non-U.S. Pension Plans | Real estate	'	'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'
Fair Value of plan assets at the end of the year	59,966	57,173
Non-U.S. Pension Plans | Insurance contracts	'	'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'
Fair Value of plan assets at the end of the year	37,468	21,214
Non-U.S. Pension Plans | Hedge funds	'	'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'
Fair Value of plan assets at the end of the year	213,936	246,389
Non-U.S. Pension Plans | Significant Unobservable Inputs (Level 3)	'	'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'
Fair Value of plan assets at the end of the year	311,370	331,852
Non-U.S. Pension Plans | Significant Unobservable Inputs (Level 3) | Infrastructure \ Raw Goods	'	'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'
Fair Value of plan assets at the beginning of the year	7,076	6,111
Sale	'	'
Purchases, sales, and settlements	-8,125	'
Realized and unrealized gains (losses)	1,025	678
Effect of exchange rate changes	24	287
Fair Value of plan assets at the end of the year	0	7,076
Non-U.S. Pension Plans | Significant Unobservable Inputs (Level 3) | Real estate	'	'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'
Fair Value of plan assets at the beginning of the year	57,173	49,537
Sale	0	0
Purchases, sales, and settlements	-6,022	0
Realized and unrealized gains (losses)	8,341	7,670
Effect of exchange rate changes	474	-34
Fair Value of plan assets at the end of the year	59,966	57,173
Non-U.S. Pension Plans | Significant Unobservable Inputs (Level 3) | 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	21,214	18,291
Sale	15,756	'
Purchases, sales, and settlements	975	1,646
Realized and unrealized gains (losses)	926	1,058
Effect of exchange rate changes	-1,403	219
Fair Value of plan assets at the end of the year	37,468	21,214
Non-U.S. Pension Plans | Significant Unobservable Inputs (Level 3) | 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	246,389	93,400
Sale	'	'
Purchases, sales, and settlements	4,915	144,441
Realized and unrealized gains (losses)	-41,096	4,664
Effect of exchange rate changes	3,728	3,884
Fair Value of plan assets at the end of the year	$213,936	$246,389

Pension_Plans_Anticipated_Cash

Pension Plans (Anticipated Cash Contributions) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 26, 2014
U.S. Pension Plans	'
Defined Benefit Plan Disclosure [Line Items]	'
Anticipated cash contributions	$4,000
Non-U.S. Pension Plans	'
Defined Benefit Plan Disclosure [Line Items]	'
Anticipated cash contributions	$38,079

Pension_Plans_Schedule_Of_Expe

Pension Plans (Schedule Of Expected Payments To Participants In Pension Plan) (Details) (USD $)	Sep. 26, 2014
In Thousands, unless otherwise specified
U.S. Pension Plans	'
Defined Benefit Plan Disclosure [Line Items]	'
2014	$38,355
2015	40,911
2016	43,283
2017	40,881
2018	40,955
For the period 2020 through 2024	208,013
Non-U.S. Pension Plans	'
Defined Benefit Plan Disclosure [Line Items]	'
2014	34,024
2015	33,485
2016	35,170
2017	37,757
2018	38,445
For the period 2020 through 2024	$242,260

Pension_Plans_Schedule_Of_Comp

Pension Plans (Schedule Of Components Of Net Periodic Pension Cost Recognized) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
U.S. Pension Plans	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Service cost	$12,077	$13,814	$12,838
Interest cost	22,041	18,569	20,923
Expected return on plan assets	-28,495	-25,826	-23,764
Actuarial loss	3,608	8,030	10,981
Prior service cost	-103	-103	-103
Net pension cost, before special items	9,128	14,484	20,875
Special termination benefits	'	29	'
Curtailments and settlements	0	'	6,035
Total net periodic pension cost recognized	9,128	14,513	26,910
Non-U.S. Pension Plans	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Service cost	25,374	30,117	22,723
Interest cost	54,208	51,331	54,287
Expected return on plan assets	-56,394	-54,817	-50,996
Actuarial loss	15,993	13,276	8,227
Prior service cost	-28	-43	152
Net pension cost, before special items	39,153	39,864	34,393
Curtailments and settlements	-15,894	-383	1,326
Total net periodic pension cost recognized	$23,259	$39,481	$35,719

Pension_Plans_Schedule_Of_Cont

Pension Plans (Schedule Of Contribution To Multiemployer Pension Plans) (Details) (Multiemployer Plan, Individually Insignificant Multiemployer Plans, Multiemployer Plans, Pension, USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Multiemployer Plans [Line Items]	'	'	'
Contributions to multiemployer pension plans	$73,519	$89,956	$87,281
Canada	'	'	'
Multiemployer Plans [Line Items]	'	'	'
Contributions to multiemployer pension plans	56,341	72,660	72,053
Europe and Australia	'	'	'
Multiemployer Plans [Line Items]	'	'	'
Contributions to multiemployer pension plans	12,693	12,930	10,808
United States	'	'	'
Multiemployer Plans [Line Items]	'	'	'
Contributions to multiemployer pension plans	$4,485	$4,366	$4,420

Other_Comprehensive_Income_Det

Other Comprehensive Income (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Amortization of Defined Benefit Items:	'	'	'
Income Tax Benefit	($190,054)	($221,366)	($202,382)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment	'	'	'
Amortization of Defined Benefit Items:	'	'	'
Actuarial losses	-19,601	-17,554	-11,444
Prior service benefit (cost)	28	43	-152
Total Before Income Tax	-19,573	-17,511	-11,596
Income Tax Benefit	4,385	5,859	3,955
Total reclassifications after-tax	($15,188)	($11,652)	($7,641)

Savings_And_Deferred_Compensat2

Savings And Deferred Compensation Plans (Savings Plans) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Savings And Deferred Compensation Plans [Abstract]	'	'	'
Savings plans contributions	$88,951	$74,686	$70,211

Savings_And_Deferred_Compensat3

Savings And Deferred Compensation Plans (Deferred Compensation Plans) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Savings And Deferred Compensation Plans [Abstract]	'	'	'
Deferred compensation plans expense	$5,321	$4,470	$4,349

Income_Taxes_Narrative_Details

Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012	Sep. 30, 2011
Income Tax Contingency [Line Items]	'	'	'	'
Valuation Allowance	$54,651,000	$37,300,000	'	'
Effective income tax rate (percent)	-35.10%	-33.50%	-34.10%	'
Undistributed earnings of the Company's foreign subsidiaries expected to be reinvested	26,100,000	'	'	'
Income tax payable upon repatriation of earnings	7,300,000	'	'	'
Gross unrecognized tax benefits	41,923,000	51,770,000	53,637,000	31,130,000
Accrued interest and penalties	39,200,000	44,800,000	'	'
Estimated period of unrecognized tax benefits (in months)	'12 months	'	'	'
Net operating losses	64,063,000	41,836,000	'	'
Foreign Country	'	'	'	'
Income Tax Contingency [Line Items]	'	'	'	'
Loss carry forwards of foreign subsidiaries	205,800,000	136,100,000	'	'
Gross unrecognized tax benefits	3,500,000	'	'	'
Expiring Between 2017 and 2034 | Foreign Country	'	'	'	'
Income Tax Contingency [Line Items]	'	'	'	'
Loss carry forwards of foreign subsidiaries	88,000,000	'	'	'
No Expiration Date [Member] | Foreign Country	'	'	'	'
Income Tax Contingency [Line Items]	'	'	'	'
Loss carry forwards of foreign subsidiaries	$117,800,000	'	'	'

Income_Taxes_Consolidated_Inco

Income Taxes (Consolidated Income Tax Expense) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Current income tax expense:	'	'	'
Federal	$102,450	$121,302	$111,035
State	18,698	23,246	23,303
Foreign	38,107	74,107	69,080
Total current tax expense	159,255	218,655	203,418
Deferred income tax expense (benefit):	'	'	'
Federal	7,561	-4,718	-2,505
State	2,789	-582	-1,985
Foreign	20,449	8,011	3,454
Total deferred income tax expense (benefit)	30,799	2,711	-1,036
Consolidated income tax expense	$190,054	$221,366	$202,382

Income_Taxes_Components_Of_Net

Income Taxes (Components Of Net Deferred Tax Assets) (Details) (USD $)	Sep. 26, 2014	Sep. 27, 2013
In Thousands, unless otherwise specified
Obligations relating to:	'	'
Defined benefit pension plans	$67,822	$97,349
Other employee benefit plans	215,863	198,869
Net operating losses	64,063	41,836
Self-insurance programs	4,672	1,758
Contract revenues and costs	39,734	19,468
Other	3,039	6,564
Valuation allowance	-54,651	-37,300
Gross deferred tax assets	340,542	328,544
Deferred tax liabilities:	'	'
Depreciation and amortization	-193,726	-127,974
Residual US tax on unremitted non-US earnings	0	-6,724
Other, net	-1,372	-7,560
Gross deferred tax liabilities	-195,098	-142,258
Net deferred tax assets	$145,444	$186,286

Income_Taxes_Income_Tax_Benefi

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 $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Income Tax Disclosure [Abstract]	'	'	'
Income tax benefits realized under stock plans	$3.40	$7.30	$9.30

Income_Taxes_Income_Tax_Expens

Income Taxes (Income Tax Expense In Consolidated Statements Of Earnings) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Income Tax Disclosure [Abstract]	'	'	'
Statutory amount	$189,758	$231,542	$207,668
State taxes, net of the federal benefit	12,750	14,892	13,538
Tax differential on foreign earnings	-8,811	-20,253	-16,944
Uncertain tax positions	-9,847	1,553	277
Other, net	6,204	-6,368	-2,157
Consolidated income tax expense	$190,054	$221,366	$202,382
Rates used to compute statutory amount	35.00%	35.00%	35.00%
Consolidated effective income tax rate	35.10%	33.50%	34.10%

Income_Taxes_Income_Tax_Paymen

Income Taxes (Income Tax Payments) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Income Tax Disclosure [Abstract]	'	'	'
Income tax payments	$173.60	$235.80	$191.40

Income_Taxes_Components_Of_Our

Income Taxes (Components Of Our Consolidated Earnings Before Taxes) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Income Tax Examination [Line Items]	'	'	'
Results of operations, income before income taxes	$542,166	$661,548	$593,336
United States earnings	'	'	'
Income Tax Examination [Line Items]	'	'	'
Results of operations, income before income taxes	288,800	352,404	286,987
Foreign earnings	'	'	'
Income Tax Examination [Line Items]	'	'	'
Results of operations, income before income taxes	$253,366	$309,144	$306,349

Income_Taxes_Reconciliation_of

Income Taxes (Reconciliation of Unrecognized Tax Benefits) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]	'	'	'
Balance, beginning of year	$51,770	$53,637	$31,130
Additions based on tax positions related to the current year	6,528	5,447	6,110
Additions for tax positions of prior years	0	0	21,438
Reductions for tax positions of prior years	-16,375	-6,354	-4,441
Settlement	0	-960	-600
Balance, end of year	$41,923	$51,770	$53,637

Commitments_And_Contingencies_2

Commitments And Contingencies, And Derivative Financial Instruments (Narrative) (Details) (USD $)	Sep. 26, 2014
Loss Contingencies [Line Items]	'
Net aggregate future lease payments	$1,100,000,000
Letters of credit outstanding	315,400,000
Standby Letters of Credit	'
Loss Contingencies [Line Items]	'
Letters of credit outstanding	312,600,000
Interest Rate Swap	'
Loss Contingencies [Line Items]	'
Notional amount of floating-to-fixed interest rate swap hedge	$52,200,000

Commitments_And_Contingencies_3

Commitments And Contingencies, And Derivative Financial Instruments (Commitments Under Operating Leases) (Details) (USD $)	Sep. 26, 2014
In Thousands, unless otherwise specified
Commitments And Contingencies, And Derivative Financial Instruments [Abstract]	'
2014	$230,866
2015	175,877
2016	153,295
2017	129,530
2018	96,865
Thereafter	308,890
Future minimum payments due	1,095,323
Amounts representing sublease income	-19,259
Total, net aggregate future lease payments	$1,076,064

Commitments_And_Contingencies_4

Commitments And Contingencies, And Derivative Financial Instruments (Rent Expense And Sublease Income) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Commitments And Contingencies, And Derivative Financial Instruments [Abstract]	'	'	'
Rent expense	$194,796	$173,340	$165,221
Sublease income	-6,102	-7,914	-8,402
Net rent	$188,694	$165,426	$156,819

Commitments_And_Contingencies_5

Commitments And Contingencies, And Derivative Financial Instruments (Significant Terms Of The Lease) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 26, 2014
Commitments And Contingencies, And Derivative Financial Instruments [Abstract]	'
End of lease term	'2015
End of term purchase option (in thousands)	$52,200
Residual value guaranty (in thousands)	$38,800

Contractual_Guarantees_Litigat1

Contractual Guarantees, Litigation, Investigations, And Insurance (Narrative) (Details) (USD $)	12 Months Ended	0 Months Ended
	Sep. 26, 2014	Aug. 09, 2014
	insurer	Motiva Enterprises LLC v. Bechtel-Jacobs CEP Port Arthur Joint Venture
Loss Contingencies [Line Items]	'	'
Minimum number of insurers with possible inability to fulfill insurance obligations	1	'
Claims sought in excess of	'	$7,000,000,000

Common_And_Preferred_Stock_Det

Common And Preferred Stock (Details) (USD $)	12 Months Ended
	Sep. 26, 2014	Sep. 27, 2013
	series
	class
Class of Stock Disclosures [Abstract]	'	'
Number of capital stock classes	2	'
Common stock, par value (in dollars per share)	$1	$1
Preferred stock, par value (in dollars per share)	$1	$1
Number of preferred stock series, minimum	1	'

Other_Financial_Information_Na

Other Financial Information (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013
Other Financial Information [Abstract]	'	'
Billed receivables collection period (in months)	'12 months	'
Unbilled amounts billed and collected, collection period (in months)	'12 months	'
Acquisition of business	$1,390	$39.40

Other_Financial_Information_Co

Other Financial Information (Components Of Receivables) (Details) (USD $)	Sep. 26, 2014	Sep. 27, 2013
In Thousands, unless otherwise specified
Other Financial Information [Abstract]	'	'
Amounts billed, net	$1,425,341	$1,389,278
Unbilled receivables and other	1,368,482	1,109,931
Retentions receivable	73,732	49,781
Total receivables, net	2,867,555	2,548,990
Other information about receivables:	'	'
Amounts due from the United States federal government included above, net of advanced billings	324,928	292,698
Claims receivable	$78,634	$25,237

Other_Financial_Information_Pr

Other Financial Information (Property, Equipment And Improvements, Net In The Consolidated Balance Sheets) (Details) (USD $)	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]	'	'	'
Property, equipment and improvements, gross	$1,092,369	$919,170	'
Accumulated depreciation and amortization	-635,572	-539,874	'
Property, plant and equipment, net, total	456,797	379,296	331,131
Land	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Property, equipment and improvements, gross	21,497	22,027	'
Buildings	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Property, equipment and improvements, gross	128,584	131,690	'
Equipment	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Property, equipment and improvements, gross	634,415	537,835	'
Leasehold improvements	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Property, equipment and improvements, gross	287,814	204,940	'
Construction in progress	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Property, equipment and improvements, gross	$20,059	$22,678	'

Other_Financial_Information_Mi

Other Financial Information (Miscellaneous Noncurrent Assets) (Details) (USD $)	Sep. 26, 2014		Sep. 27, 2013
In Thousands, unless otherwise specified
Other Financial Information [Abstract]	'		'
Deferred income taxes	$170,649		$197,458
Cash surrender value of life insurance policies	116,686		100,253
Investments	226,628		194,782
Notes receivable	8,007		11,689
Reimbursable pension costs	77,710	[1]	84,348	[1]
Other	38,570		26,025
Total	$638,250		$614,555
[1]	Consists of costs incurred relating to a defined benefit pension plan covering employees providing services on a contract with, and for the benefit of, the U.S. federal government pursuant to which such costs are fully reimbursable.

Other_Financial_Information_Co1

Other Financial Information (Components Of Accrued Liabilities) (Details) (USD $)	Sep. 26, 2014	Sep. 27, 2013
In Thousands, unless otherwise specified
Other Financial Information [Abstract]	'	'
Accrued payroll and related liabilities	$782,615	$688,391
Project-related accruals	218,460	115,418
Insurance liabilities	52,826	48,209
Sales and other similar taxes	52,373	47,973
Deferred rent	96,129	57,581
Other	77,153	72,244
Total	$1,279,556	$1,029,816

Other_Financial_Information_Co2

Other Financial Information (Components Of Other Deferred Liabilities) (Details) (USD $)	Sep. 26, 2014	Sep. 27, 2013
In Thousands, unless otherwise specified
Other Financial Information [Abstract]	'	'
Liabilities relating to defined benefit pension and early retirement plans	$407,263	$416,707
Liabilities relating to nonqualified deferred compensation arrangements	114,325	101,653
Deferred income taxes	195,098	142,258
Miscellaneous	117,392	62,486
Total	$834,078	$723,104

Other_Financial_Information_Co3

Other Financial Information (Components Of Total Accumulated Other Comprehensive Loss) (Details) (USD $)	Sep. 26, 2014	Sep. 27, 2013
In Thousands, unless otherwise specified
Other Financial Information [Abstract]	'	'
Foreign currency translation adjustments	($62,919)	($32,853)
Adjustments relating to defined benefit pension plans	-299,210	-269,345
Other	-1,420	-1,929
Total	($363,549)	($304,127)

Other_Financial_Information_Su

Other Financial Information (Supplemental Cash Flow Information) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013
Other Financial Information [Abstract]	'	'
Working capital	$48,327	$4,197
Property and equipment	59,216	386
Noncurrent assets	262,450	0
Deferred liabilities	-7,895	2,181
Non-controlling interests	16,572	18,589
Foreign currency translation	1,768	-3,461
Goodwill	$1,005,923	$17,537

Segment_Information_Financial_

Segment Information (Financial Information By Geographic Area) (Details) (USD $)

3 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Sep. 26, 2014

Jun. 27, 2014

Mar. 28, 2014

Dec. 27, 2013

Sep. 27, 2013

Jun. 28, 2013

Mar. 29, 2013

Dec. 28, 2012

Sep. 28, 2012

Jun. 29, 2012

Mar. 30, 2012

Dec. 30, 2011

Sep. 26, 2014

Sep. 27, 2013

Sep. 28, 2012

segments

categories

Revenues from External Customers and Long-Lived Assets [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of service categories

'

'

'

'

'

'

'

'

'

'

'

'

4

'

'

Number of reportable segments

'

'

'

'

'

'

'

'

'

'

'

'

1

'

'

Revenues

$3,218,442

$3,231,791

$3,176,033

$3,068,891

$3,142,656

$3,080,995

$2,835,084

$2,759,641

$2,786,285

$2,772,874

$2,702,851

$2,631,768

$12,695,157

$11,818,376

$10,893,778

Long-lived assets

456,797

'

'

'

379,296

'

'

'

331,131

'

'

'

456,797

379,296

331,131

United States

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revenues from External Customers and Long-Lived Assets [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

'

'

'

'

'

'

'

'

'

'

'

'

7,078,366

6,993,594

6,749,583

Long-lived assets

240,501

'

'

'

230,281

'

'

'

203,746

'

'

'

240,501

230,281

203,746

Europe

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revenues from External Customers and Long-Lived Assets [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

'

'

'

'

'

'

'

'

'

'

'

'

2,402,399

2,148,504

1,681,421

Long-lived assets

58,562

'

'

'

47,128

'

'

'

46,763

'

'

'

58,562

47,128

46,763

Canada

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revenues from External Customers and Long-Lived Assets [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

'

'

'

'

'

'

'

'

'

'

'

'

1,344,632

1,652,386

1,564,883

Long-lived assets

51,622

'

'

'

61,122

'

'

'

47,539

'

'

'

51,622

61,122

47,539

Asia

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revenues from External Customers and Long-Lived Assets [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

'

'

'

'

'

'

'

'

'

'

'

'

299,086

204,203

156,748

Long-lived assets

4,063

'

'

'

4,272

'

'

'

3,580

'

'

'

4,063

4,272

3,580

India

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revenues from External Customers and Long-Lived Assets [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

'

'

'

'

'

'

'

'

'

'

'

'

148,453

158,908

124,362

Long-lived assets

17,960

'

'

'

15,049

'

'

'

17,094

'

'

'

17,960

15,049

17,094

Australia and New Zealand

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revenues from External Customers and Long-Lived Assets [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

'

'

'

'

'

'

'

'

'

'

'

'

709,379

141,507

253,932

Long-lived assets

49,436

'

'

'

8,329

'

'

'

7,859

'

'

'

49,436

8,329

7,859

South America and Mexico

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revenues from External Customers and Long-Lived Assets [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

'

'

'

'

'

'

'

'

'

'

'

'

271,213

241,590

158,141

Long-lived assets

11,084

'

'

'

6,159

'

'

'

2,400

'

'

'

11,084

6,159

2,400

Middle East and Africa

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revenues from External Customers and Long-Lived Assets [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

'

'

'

'

'

'

'

'

'

'

'

'

441,629

277,684

204,708

Long-lived assets

$23,569

'

'

'

$6,956

'

'

'

$2,150

'

'

'

$23,569

$6,956

$2,150

Segment_Information_Revenues_E

Segment Information (Revenues Earned Directly Or Indirectly From The U.S. Federal Government And Its Agencies) (Details)	12 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Segment Reporting [Abstract]	'	'	'
Percentage of revenue earned from the U.S. federal government and its agencies	17.80%	19.90%	22.10%

Selected_Quarterly_Information2

Selected Quarterly Information - Unaudited (Details) (USD $)

3 Months Ended

12 Months Ended

Sep. 26, 2014

Jun. 27, 2014

Mar. 28, 2014

Dec. 27, 2013

Sep. 27, 2013

Jun. 28, 2013

Mar. 29, 2013

Dec. 28, 2012

Sep. 28, 2012

Jun. 29, 2012

Mar. 30, 2012

Dec. 30, 2011

Sep. 26, 2014

Sep. 27, 2013

Sep. 28, 2012

Finite-Lived Intangible Assets [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

$3,218,442,000

$3,231,791,000

$3,176,033,000

$3,068,891,000

$3,142,656,000

$3,080,995,000

$2,835,084,000

$2,759,641,000

$2,786,285,000

$2,772,874,000

$2,702,851,000

$2,631,768,000

$12,695,157,000

$11,818,376,000

$10,893,778,000

Operating profit

136,650,000

[1]

123,937,000

[1]

122,434,000

[1]

145,047,000

[1]

175,148,000

[1]

168,359,000

[1]

165,203,000

[1]

160,269,000

[1]

167,617,000

[1]

153,366,000

[1]

133,138,000

[1]

141,952,000

[1]

528,068,000

[1]

668,979,000

[1]

596,073,000

[1]

Earnings before taxes

144,805,000

118,046,000

132,394,000

146,921,000

174,906,000

168,423,000

161,908,000

156,311,000

170,096,000

151,371,000

132,315,000

139,554,000

542,166,000

661,548,000

593,336,000

Net Earnings of the Group

91,054,000

71,309,000

90,800,000

98,949,000

116,481,000

112,089,000

107,089,000

104,523,000

111,082,000

100,990,000

87,446,000

91,436,000

352,112,000

440,182,000

390,954,000

Net earnings attributable to Jacobs

86,074,000

[2]

64,842,000

[2]

83,460,000

[3]

93,732,000

110,811,000

108,871,000

104,401,000

99,010,000

107,411,000

[4]

97,900,000

83,933,000

89,710,000

328,108,000

423,093,000

378,954,000

[4]

Earnings per share:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Basic (in dollars per share)

$0.66

[2]

$0.50

[2]

$0.64

[3]

$0.72

$0.85

$0.84

$0.81

$0.77

$0.84

[4]

$0.77

$0.66

$0.71

$2.51

$3.27

$2.97

[4]

Diluted (in dollars per share)

$0.65

[2]

$0.49

[2]

$0.63

[3]

$0.71

$0.84

$0.83

$0.80

$0.76

$0.83

[4]

$0.76

$0.65

$0.70

$2.48

$3.23

$2.94

[4]

Restructuring Charges

-30,400,000

-47,000,000

'

'

'

'

'

'

'

'

'

'

-93,300,000

'

'

Effect of restructuring charge on earnings per diluted share (in dollars per share)

($0.23)

$0.35

'

'

'

'

'

'

'

'

'

'

'

'

'

Gain after tax on sale of intellectual property

'

'

'

'

'

'

'

'

'

'

'

'

'

4,000,000

'

Gain on sale of intellectual property

'

'

'

'

'

'

'

'

'

'

'

'

12,147,000

0

6,292,000

Intellectual Property

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Earnings per share:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Gain after tax on sale of intellectual property per diluted share (in dollars per share)

'

'

$0.05

'

'

'

'

'

'

'

'

'

'

$0.03

'

Gain on sale of intellectual property

'

'

$6,400,000

'

'

'

'

'

'

'

'

'

'

'

'

[1]

Operating profit represents revenues less (i) direct costs of contracts, and (ii) selling, general and administrative expenses.

[2]

Includes costs of $47.0 million, or $0.35 per diluted share, in the third quarter of fiscal 2014, and $30.4 million, or $0.23 per diluted share, in the fourth quarter of fiscal 2014, related to the Company's restructuring activities.

[3]

Includes $6.4 million, or $0.05 per diluted share, increase to net earnings related to a gain on the sale of certain intellectual property in the second quarter of fiscal 2014.

[4]

Includes an after-tax gain of $4.0 million, or $0.03 per diluted share, related to the sale of the Company's intellectual property for iron ore pelletizing and certain other related assets.

Definitions_Details

Definitions (Details) (USD $)	3 Months Ended		12 Months Ended
In Millions, unless otherwise specified	Sep. 26, 2014	Jun. 27, 2014	Sep. 26, 2014
			quarter
Definitions [Abstract]	'	'	'
Restructuring Charges	($30.40)	($47)	($93.30)
Number of consecutive fiscal quarters included In consolidated leverage ratio calculation	'	'	4