Engility Inactive 10-Q12 Nov 132013 Q3 Quarterly reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
Document and Entity Information	Sep. 27, 2013	Nov. 01, 2013
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	27-Sep-13	'
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q3	'
Entity Registrant Name	'Engility Holdings, Inc.	'
Entity Central Index Key	'0001544229	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Non-accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	17,232,246

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Sep. 27, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 27, 2013	Dec. 31, 2012
Current assets:	'	'
Cash and cash equivalents	$24,323	$27,021
Receivables, net	316,488	366,236
Other current assets	28,216	34,832
Total current assets	369,027	428,089
Property, plant and equipment, net	10,898	11,941
Goodwill	477,604	477,604
Identifiable intangible assets, net	94,386	100,929
Other assets	7,352	8,887
Total assets	959,267	1,027,450
Current liabilities:	'	'
Current portion of long-term debt	7,500	50,250
Accounts payable, trade	23,492	20,725
Accrued employment costs	62,602	63,278
Accrued expenses	59,275	76,955
Advance payments and billings in excess of costs incurred	26,238	24,855
Deferred income taxes, current and income taxes payable	8,089	10,607
Other current liabilities	17,055	19,311
Total current liabilities	204,251	265,981
Long-term debt	222,500	284,750
Income-tax payable	80,093	68,725
Other liabilities	17,473	19,683
Total liabilities	524,317	639,139
Commitments and contingencies (see Note 9)	'	'
Equity:	'	'
Preferred stock, par value $0.01 per share, 25,000 shares authorized, none issued or outstanding as of September 27, 2013 and December 31, 2012	'	'
Common stock, par value $0.01 per share, 175,000 shares authorized, 17,221 shares issued and outstanding as of September 27, 2013 and 16,703 shares issued and outstanding as of December 31, 2012	172	168
Additional paid-in capital	762,256	755,638
Accumulated deficit	-341,590	-380,438
Noncontrolling interest	14,112	12,943
Total equity	434,950	388,311
Total liabilities and equity	$959,267	$1,027,450

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 27, 2013	Dec. 31, 2012
In Thousands, except Per Share data, unless otherwise specified	Sep. 27, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]	'	'
Preferred stock, par value	$0.01	$0.01
Preferred stock, shares authorized	25,000	25,000
Preferred stock, shares issued	'	'
Preferred stock, shares outstanding	'	'
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	175,000	175,000
Common stock, shares issued	17,221	16,703
Common stock, shares outstanding	17,221	16,703

Consolidated_and_Combined_Stat

Consolidated and Combined Statements of Operations (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 27, 2013	Sep. 28, 2012	Sep. 27, 2013	Sep. 28, 2012
Income Statement [Abstract]	'	'	'	'
Revenue	$339,302	$404,496	$1,078,309	$1,159,625
Revenue from former affiliated entities	'	4,888	'	100,035
Total revenue	339,302	409,384	1,078,309	1,259,660
Costs and expenses	'	'	'	'
Cost of revenue	289,280	352,063	932,874	981,710
Cost of revenue from former affiliated entities	'	4,888	'	100,035
Total cost of revenue	289,280	356,951	932,874	1,081,745
Selling, general and administrative expenses	19,901	38,696	56,134	107,589
Goodwill impairment charge	'	426,436	'	426,436
Total costs and expenses	309,181	822,083	989,008	1,615,770
Operating income (loss)	30,121	-412,699	89,301	-356,110
Interest expense, net	7,558	4,833	19,099	5,027
Other income (expense), net	193	-7	266	-52
Income (loss) from continuing operations before income taxes	22,756	-417,539	70,468	-361,189
Provision for income taxes	8,699	1,378	27,344	24,997
Income (loss) from continuing operations	14,057	-418,917	43,124	-386,186
Loss from discontinued operations before income taxes	'	-469	'	-1,017
Benefit for income taxes	'	-161	'	-391
Loss from discontinued operations	'	-308	'	-626
Net income (loss)	14,057	-419,225	43,124	-386,812
Less: Net income attributable to noncontrolling interest	2,049	1,080	4,276	4,510
Net income (loss) attributable to Engility	$12,008	($420,305)	$38,848	($391,322)
Earnings (loss) per share allocable to Engility Holdings, Inc. common shareholders - Basic	'	'	'	'
Net income (loss) per share from continuing operations less noncontrolling interest	$0.71	($25.78)	$2.30	($24.15)
Net income (loss) per share from discontinued operations	'	($0.02)	'	($0.04)
Net income (loss) per share attributable to Engility	$0.71	($25.80)	$2.30	($24.19)
Earnings (loss) per share allocable to Engility Holdings, Inc. common shareholders - Diluted	'	'	'	'
Net income (loss) per share from continuing operations less noncontrolling interest	$0.68	($25.78)	$2.21	($24.15)
Net income (loss) per share from discontinued operations	'	($0.02)	'	($0.04)
Net income (loss) per share attributable to Engility	$0.68	($25.80)	$2.21	($24.19)
Weighted average number of shares outstanding	'	'	'	'
Basic	16,915	16,291	16,855	16,176
Diluted	17,770	16,291	17,592	16,176

Consolidated_and_Combined_Stat1

Consolidated and Combined Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 27, 2013	Sep. 28, 2012
Operating activities:	'	'
Net income (loss)	$43,124	($386,812)
Less: loss from discontinued operations, net of tax	'	-626
Income (loss) from continuing operations	43,124	-386,186
Goodwill impairment charge	'	426,436
Share-based compensation	7,282	4,552
Depreciation and amortization	9,055	12,365
Amortization of bank debt fees	5,880	645
Deferred income taxes	-2,727	-20,854
Changes in operating assets and liabilities:	'	'
Receivables	49,748	25,389
Other assets	4,145	-13,362
Accounts payable, trade	2,767	-21,832
Accrued employment costs	-676	6,224
Accrued expenses	-17,680	17,032
Advance payments and billings in excess of costs incurred	1,383	-6,727
Other liabilities	7,215	297
Net cash provided by operating activities from continuing operations	109,516	43,979
Investing activities:	'	'
Capital expenditures	-1,470	-1,640
Proceeds from sale of property, plant, and equipment	'	604
Net cash used in investing activities from continuing operations	-1,470	-1,036
Financing activities:	'	'
Borrowings from term loan	200,000	335,000
Repayments of term loan	-335,000	'
Borrowings from revolving credit facility	167,500	12,190
Repayments of revolving credit facility	-137,500	-12,190
Debt issuance costs	-2,493	-11,005
Net transfers to prior parent	'	-25,633
Dividend paid to prior parent	'	-335,000
Proceeds from share-based payment arrangements	893	484
Payment of employee withholding taxes on restricted stock units	-1,037	'
Distributions to non-controlling interest member	-3,107	-1,402
Net cash used in financing activities from continuing operations	-110,744	-37,556
Discontinued Operations:	'	'
Net cash provided by operating activities	'	25,952
Net cash used in investing activities	'	'
Net cash used in financing activities	'	-25,952
Net cash used in discontinued operations	'	'
Net change in cash and cash equivalents	-2,698	5,387
Cash and cash equivalents, beginning of period	27,021	13,688
Cash and cash equivalents, end of period	$24,323	$19,075

Basis_of_Presentation

Basis of Presentation	9 Months Ended
Basis of Presentation	Sep. 27, 2013
Organization Consolidation And Presentation Of Financial Statements [Abstract]	'
Basis of Presentation	'
	1	Basis of Presentation.
	Spin-Off from L-3: On July 17, 2012, L-3 Communications Holdings, Inc. completed the spin-off of Engility Holdings, Inc. For the periods prior to July 17, 2012, Engility Holdings and its current subsidiaries were direct or indirect subsidiaries of L-3 Communications Holdings. Unless the context indicates otherwise, (i) references to Engility, the Company, we, us or our refer to Engility Holdings, Inc. and its subsidiaries and (ii) references to L-3 refer to L-3 Communications Holdings, Inc. and its subsidiaries.
	Effective as of 5:00 p.m., New York time, on July 17, 2012 (the Distribution Date), our common stock was distributed, on a pro rata basis, to L-3’s stockholders of record as of the close of business on July 16, 2012 (the Record Date). On the Distribution Date, each holder of L-3 common stock received one share of our common stock for every six shares of L-3 common stock held on the Record Date. The spin-off was completed pursuant to a Distribution Agreement and several other agreements with L-3 related to the spin-off, including an Employee Matters Agreement, a Tax Matters Agreement, a Transition Services Agreement and two Master Supply Agreements. These agreements govern the relationship between us and L-3 following the spin-off and provide for the allocation of various assets, liabilities, rights and obligations. These agreements also include arrangements for transition services to be provided by L-3 to Engility. For a discussion of each agreement, see the section entitled “Certain Relationships and Related Party Transactions — Agreements with L-3 Related to the Spin-Off” in our Proxy Statement for the Annual Meeting of Stockholders held on May 23, 2013, as filed with the U.S. Securities and Exchange Commission (the SEC) on April 12, 2013. We paid $335 million as a cash dividend to L-3 on the Distribution Date.
	Our Registration Statement on Form 10 was declared effective by the SEC on July 2, 2012, and our common stock began “regular-way” trading on the New York Stock Exchange on July 18, 2012 under the symbol “EGL.”
	Description of Business: Engility, through its predecessors, has provided mission-critical services to the U.S. government for over four decades. Our customers include the U.S. Department of Defense (DoD), U.S. Department of Justice (DoJ), U.S. Agency for International Development (USAID), U.S. Department of State (DoS), Federal Aviation Administration (FAA), Department of Homeland Security (DHS), and allied foreign governments. We attribute the strength of our customer relationships to our singular focus on services, our industry-leading capabilities in program planning and management, superior past performance, and the experience of our people and their commitment to our customers’ missions. As of September 27, 2013, we employed approximately 7,000 individuals globally and operated in over 40 countries. We are led by a seasoned executive team, which is composed of industry and government veterans.
	We provide our service offerings in six key areas: (i) specialized technical consulting; (ii) program and business support services; (iii) engineering and technology lifecycle support; (iv) information technology modernization and sustainment; (v) supply chain services and logistics management; and (vi) training and education.
	Principles of Consolidation and Combination and Basis of Presentation: The unaudited consolidated and combined financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) for interim financial information and in accordance with Article 10 of Regulation S-X of the SEC and reflect the financial position, results of operations and cash flows of our businesses. Accordingly, they do not include all of the disclosures required by U.S. GAAP for a complete set of annual audited financial statements.
	The accompanying financial information should be read in conjunction with the consolidated financial statements and notes contained in our Annual Report on Form 10-K filed with the SEC for the year ended December 31, 2012 (2012 Form 10-K). In the opinion of management, all adjustments (consisting of normal and recurring adjustments) considered necessary for a fair statement of the results for the interim periods presented have been included. The results of operations for the interim periods are not necessarily indicative of results for the full year.
	Our accompanying unaudited consolidated and combined financial statements, for the periods prior to the spin-off, were derived from the accounting records of L-3 as if we operated on a stand-alone basis. The unaudited combined statements of operations include expense allocations for the corporate functions provided to us by L-3 prior to the Distribution Date, including, but not limited to, executive management, finance, legal, human resources, employee benefits administration, treasury, tax, internal audit, information technology, communications, ethics and compliance, insurance, and stock-based compensation. These expenses were allocated to us on the basis of direct usage when identifiable, with the remainder allocated on the basis of revenue or headcount. We believe that these allocations have been made on a consistent basis and are a reasonable reflection of the utilization of the services received by, or benefits provided to, us during the periods presented.
	Following our spin-off from L-3, we perform these functions using internal resources and purchased services, some of which are provided by L-3 during a transitional period pursuant to the Transition Services Agreement.
	Transactions prior to the spin-off between us and L-3 were considered to be effectively settled for cash at the time the transaction was recorded, and therefore are included as financing activities in the unaudited consolidated and combined statements of cash flows.
	Consistent with L-3’s centralized approach to cash management and financing its operations, prior to the spin-off, the majority of our cash receipts were transferred to L-3 daily and L-3 funded our working capital and capital expenditure requirements as needed. Cash transfers to and from L-3’s cash management accounts were reflected as a component of prior parent company investment in the unaudited consolidated and combined balance sheets. Net changes to the prior parent company investment for the period are reflected in the net transfers from prior parent in cash flows from financing activities section of the accompanying statement of cash flows. Following the spin-off, we have financed our operations primarily through operating cash flow and the revolving portion of the 2012 Credit Facility, and currently, the 2013 Credit Facility (each as defined in Note 6 below), as needed.
	See Note 4 for a further description of the transactions between us and L-3.
	Non-controlling Interest: Engility holds a 50.1% majority interest in Forfeiture Support Associates J.V. (FSA). The results of operations of FSA are included in Engility’s Consolidated and Combined Statements of Operations from the date control was obtained. The non-controlling interest reported on the Consolidated and Combined Balance Sheets represents the portion of FSA’s equity that is attributable to the non-controlling interest.

	Accounting Estimates: The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates using assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting periods. The most significant of these estimates relate to the recoverability, useful lives and valuation of identifiable intangible assets and goodwill, income tax contingencies and revenue and expenses for certain revenue arrangements. Actual amounts will differ from these estimates and could differ materially.
	Change in Operating and Reportable Segments: Prior to 2013, we operated in two segments. Effective January 1, 2013, we operate as one segment. Accordingly, all segment disclosure has been eliminated as it is no longer relevant based on the Company’s current operating and reporting structure.
	Reporting Periods: Our fiscal year begins on January 1 and ends on December 31. Our first three fiscal quarters end on the 13th Friday after the first day of the quarter and the fourth quarter ends on December 31.
	Revision to Costs and Expenses: As previously disclosed, during the process of finalizing the financial statements for the fiscal year ended December 31, 2012, we determined that during the three months ended March 30, 2012, June 29, 2012 and September 28, 2012, we improperly classified certain amounts in cost of revenue that were selling, general and administrative in nature. We have therefore adjusted the presentation in this Form 10-Q to correctly present these amounts as selling, general and administrative expenses. We have assessed the impact of the adjustments on the statements of operations and determined that the periods were not materially misstated. These changes did not impact the balance sheets or statements of cash flows. The revision decreased cost of revenue, with a corresponding increase to selling, general and administrative expenses of $2,498, $2,195 and $2,084 for the three months ended March 30, 2012, June 29, 2012 and September 28, 2012, respectively. There was no impact to operating income due to this revision.
	Earnings per Share: For periods prior to the spin-off, basic and diluted earnings per share (EPS) was calculated using 16 million shares of our common stock that were distributed to L-3 shareholders on July 17, 2012. For periods after the spin-off, basic EPS is computed by dividing net income by the weighted average number of common shares outstanding for the period. Diluted EPS reflects potential dilution that could occur if securities to issue common stock were exercised or converted into common stock. Diluted EPS includes the effect of the employee stock purchase plan, restricted stock units, and stock options calculated using the treasury stock method. For the three and nine months ended September 27, 2013, 0 shares and 12,355 shares, respectively, were not included in diluted EPS due to their anti-dilutive effects. For the three and nine months ended September 28, 2012, 552,667 shares and 184,222 shares, respectively, were not included in diluted EPS due to their anti-dilutive effects.


			Three Months Ended					Nine Months Ended
			September 27,		September 28,			September 27,		September 28,
			2013		2012			2013		2012
			(amounts in thousands, except per share amounts)
	Net income (loss) attributable to Engility from continuing operations less noncontrolling interest		$	12,008	$	(419,997	)	$	38,848	$	(390,696	)

	Net loss attributable to Engility from discontinued operations			—		(308	)		—		(626	)

	Net income (loss) attributable to Engility		$	12,008	$	(420,305	)	$	38,848	$	(391,322	)

	Weighted average number of shares outstanding – Basic			16,915		16,291			16,855		16,176
	Dilutive effect of share-based compensation outstanding after application of the treasury stock method			855		—			737		—

	Weighted average number of shares – Diluted			17,770		16,291			17,592		16,176

	Earnings (loss) per share allocable to Engility Holdings, Inc. common shareholders – Basic
	Net income (loss) per share from continuing operations less noncontrolling interest		$	0.71	$	(25.78	)	$	2.3	$	(24.15	)

	Net loss per share from discontinued operations		$	—	$	(0.02	)	$	—	$	(0.04	)

	Net income (loss) per share attributable to Engility		$	0.71	$	(25.80	)	$	2.3	$	(24.19	)

	Earnings (loss) per share allocable to Engility Holdings, Inc. common shareholders – Diluted
	Net income (loss) per share from continuing operations less noncontrolling interest		$	0.68	$	(25.78	)	$	2.21	$	(24.15	)

	Net loss per share from discontinued operations		$	—	$	(0.02	)	$	—	$	(0.04	)

	Net income (loss) per share attributable to Engility		$	0.68	$	(25.80	)	$	2.21	$	(24.19	)

Receivables

Receivables	9 Months Ended
Receivables	Sep. 27, 2013
Receivables [Abstract]	'
Receivables	'
	2	Receivables
	Our receivables principally relate to contracts with the U.S. government and prime contractors or subcontractors of the U.S. government. The components of contract receivables are presented in the table below.


			As of			As of
			September 27,			December 31,
			2013			2012
	Billed receivables		$	153,313		$	172,042
	Unbilled receivables			164,870			198,248
	Allowance for doubtful accounts			(1,695	)		(4,054	)

	Total receivables, net		$	316,488		$	366,236

Goodwill_and_Identifiable_Inta

Goodwill and Identifiable Intangible Assets	9 Months Ended
Goodwill and Identifiable Intangible Assets	Sep. 27, 2013
Goodwill And Intangible Assets Disclosure [Abstract]	'
Goodwill and Identifiable Intangible Assets	'
	3	Goodwill and Identifiable Intangible Assets
	Goodwill: In accordance with the accounting standards for business combinations, we record the assets acquired and liabilities assumed based on their estimated fair values at the date of acquisition (commonly referred to as the purchase price allocation). Goodwill was $478 million at September 27, 2013 and December 31, 2012.
	Identifiable Intangible Assets: Information on our identifiable intangible assets that are subject to amortization is presented in the table below.


						September 27, 2013						December 31, 2012
			Weighted			Gross		Accumulated		Net		Gross		Accumulated		Net
			Average			Carrying		Amortization		Carrying		Carrying		Amortization		Carrying
			Amortization			Amount				Amount		Amount				Amount
			Period
				(in years	)
	Customer contractual relationships			28		$	178,630	$	84,268	$	94,362	$	178,630	$	77,762	$	100,868
	Technology			—			29,259		29,259		—		29,259		29,259		—
	Favorable leasehold interests			10			1,827		1,803		24		1,827		1,766		61

	Total					$	209,716	$	115,330	$	94,386	$	209,716	$	108,787	$	100,929

	Our amortization expense recorded for our identifiable intangible assets is presented in the table below.


			Three Months Ended					Nine Months Ended
			September 27,			September 28,		September 27,		September 28,
			2013			2012		2013		2012
	Amortization expense		$	2,181		$	3,276	$	6,542	$	9,828

Related_Party_Transactions_and

Related Party Transactions and Parent Company Investment	9 Months Ended
Related Party Transactions and Parent Company Investment	Sep. 27, 2013
Related Party Transactions [Abstract]	'
Related Party Transactions and Parent Company Investment	'
	4	Related Party Transactions and Parent Company Investment
	Allocation of General Corporate Expenses: There were no corporate allocations for the three and nine months ended September 27, 2013 as we were not affiliated with L-3 during these periods. Selling, general and administrative expenses for the three months ended September 28, 2012 include a total of $1,322 of corporate allocations from our prior parent, L-3, consisting of $1,322 of allocations for corporate functions provided to the Company. Selling, general and administrative expenses for the nine months ended September 28, 2012 include a total of $37,748 of corporate allocations from our prior parent, L-3, consisting of (i) $15,322 of allocations for corporate functions provided to the Company and (ii) $22,426 of direct corporate expenses. Direct corporate expenses include employee benefits, stock-based compensation, insurance, and treasury expenses that have been allocated based on our direct usage of these items.
	Related Party Revenue and Cost of Revenue: We had no related party revenue or purchases for the three and nine months ended September 27, 2013 as we were not affiliated with L-3 during these periods. Prior to the spin-off, we were party to transactions to purchase and sell products and services to and from other L-3 subsidiaries and divisions. For the three and nine months ended September 28, 2012, revenue earned from these affiliated entities, and corresponding purchases of products and services from these affiliates, were $4,888 and $100,035, respectively. Purchases of products and services from these affiliated entities for the three and nine months ended September 28, 2012 were included within revenue and cost of revenue in the unaudited consolidated and combined statements of operations.

	Parent Company Investment: The components of our net transfers (to)/from prior parent are presented in the table below.


			Three Months Ended				Nine Months Ended
			September 27,		September 28,		September 27,		September 28,
			2013		2012		2013		2012
	Intercompany revenue and purchases, net		$	—	$	—	$	—	$	(86,019	)
	Cash pooling and general financing activities			—		—		—		(34,404	)
	Corporate allocations			—		1,322		—		37,748
	Income taxes			—		—		—		33,282
	Net transfers related to discontinued operations			—		14,535		—		23,760

	Total net transfers from prior parent		$	—	$	15,857	$	—	$	(25,633	)

ShareBased_Compensation

Share-Based Compensation	9 Months Ended
	Sep. 27, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Share-Based Compensation	'
	5	Share-Based Compensation
	Immediately prior to the spin-off, certain of our employees participated in the following L-3 stock based compensation plans: 2008 Long Term Performance Plan (2008 LTPP), 1999 Long Term Performance Plan and 1997 Stock Option Plan. Since our spin-off from L-3, certain of our employees have participated in our Amended and Restated 2012 Long Term Performance Plan (2012 LTPP), which is substantially similar to the 2008 LTPP. In connection with the spin-off, we assumed under the 2012 LTPP each outstanding option to purchase L-3 common stock and each L-3 restricted stock unit (L-3 RSUs) held by our employees. These assumed equity awards converted into 284,594 options to purchase Engility common stock and 684,895 Engility restricted stock units (RSUs), respectively, having the same intrinsic value as the corresponding converted L-3 award.
	Upon vesting of RSUs, we permit employees to have the Company withhold vested shares of Engility common stock in order to meet minimum statutory tax withholding requirements, and we remit the withholding taxes to the appropriate taxing jurisdiction. We present these withholdings as cash outflows from financing activities in our statement of cash flows.
	For the nine months ended September 28, 2012
	Stock Options: L-3 granted certain of our employees 53,057 options to purchase L-3 common stock with an exercise price equal to the closing price of L-3 common stock on the date of grant. The options expire 10 years from the date of grant and vest ratably over a three-year period on the annual anniversary of the date of grant. The weighted average grant date fair value for the options awarded on the grant date was $11.49 per option and was estimated using the Black-Scholes option-pricing model.
	Restricted Stock Units: For the nine months ended September 28, 2012, L-3 granted certain of our employees 154,066 L-3 RSUs with a weighted average grant date fair value of $16.83 per share. As a result of our assuming these equity awards in connection with the spin-off, these L-3 RSUs automatically convert into shares of Engility common stock upon vesting, and are subject to forfeiture until certain restrictions have lapsed, including a three-year cliff vesting period for employees.
	Following our spin-off from L-3, we granted 362,274 RSUs to certain employees and directors with a weighted average grant date fair value of $17.68 per share. RSUs automatically convert into shares of Engility common stock upon vesting, and are subject to forfeiture until certain restrictions have lapsed, including a three-year cliff vesting period for employees. For directors, the RSUs vest after one year, but will not be converted to shares until the earlier of (i) the date on which the person ceases to be a director of the company or (ii) a change of control of our company.
	For the nine months ended September 27, 2013
	Stock Options: For the nine months ended September 27, 2013, there were no stock options granted.
	Restricted Stock Units: For the nine months ended September 27, 2013, we granted certain of our employees 200,745 RSUs with a weighted average grant date fair value of $24.04 per share. These RSUs automatically convert into shares of Engility common stock upon vesting, and are subject to forfeiture until certain restrictions have lapsed. 101,670 of these RSUs vest ratably over a term of three years from the grant date, 25% on the first anniversary of the grant date, 25% on the second anniversary of the grant date and 50% on the third anniversary of the grant date. 99,075 of the RSUs granted to our employees during this period cliff vest on the third anniversary of the date of grant.
	For the nine months ended September 27, 2013, we granted 18,498 RSUs to the non-management members of the board of directors with a weighted average grant date fair value of $24.32 per share. These RSUs are subject to forfeiture until certain restrictions have lapsed. These RSUs vest after one year, but will not be converted to shares until the earlier of (i) the date on which the person ceases to be a director of the Company or (ii) a change of control of the Company.
	Performance Shares: During the nine months ended September 27, 2013, we granted 305,020 performance shares with a weighted average grant date fair value of $28.24 to certain of our employees. Performance shares are grants of restricted stock that generally cliff vest after three years based on our performance at the end of a three-year period beginning January 1, 2013. The number of shares of our common stock that are ultimately vested and delivered in respect of these performance shares will range from 0% to 200% of the target amount depending on the Company’s performance against a peer group, as approved by the Compensation Committee of the Board of Directors, based on the following two metrics, each of which are weighted equally: relative revenue (based on a compounded annual growth rate) and relative total stockholder return (TSR). No shares will vest or be delivered to holders of performance shares, including with respect to relative revenue, if we do not achieve at least the threshold level of performance for TSR.

Debt

Debt	9 Months Ended
	Sep. 27, 2013
Debt Disclosure [Abstract]	'
Debt	'
	6	Debt
	2012 Credit Facility
	In connection with our spin-off from L-3, on July 17, 2012, we, through our wholly owned subsidiary, Engility Corporation, entered into a credit facility that provided for total aggregate borrowings of $400 million under a $335 million senior secured term loan facility and a $65 million senior secured revolving credit facility with Bank of America, N.A., as administrative agent, and the other lenders party thereto (the 2012 Credit Facility). On July 17, 2012, we borrowed $335 million under the 2012 Credit Facility which was used to pay a cash dividend to L-3. On August 9, 2013, we terminated the 2012 Credit Facility and entered into a new credit facility, as described below.
	Maturity, Interest Rate and Fees. The loans under the 2012 Credit Facility were due and payable on July 17, 2017 and bore interest at a rate per annum equal to an applicable margin, plus, at our option (other than with respect to swingline loans, which must be base rate loans), either (a) a base rate determined by reference to the highest of (1) the prime rate of Bank of America, N.A., (2) the federal funds effective rate plus 0.5%, (3) a London Interbank Offer Rate (LIBOR) determined by reference to the costs of funds for U.S. dollar deposits for an interest period of one month adjusted for certain additional costs which could not be less than 1.25%, plus 1.00% and (4) 2.25% or (b) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for the interest period relevant to such borrowing adjusted for certain additional costs which could be no less than 1.25%.
	Amortization and Final Maturity. Beginning April 1, 2013, we were required to make scheduled quarterly payments equal to 3.75% of the original principal amount of the term loan, or approximately $12.6 million per quarter, with the balance to be due and payable on the fifth anniversary of the closing date, July 17, 2017. The 2012 Credit Facility was terminated and repaid in full upon entering the 2013 Credit Facility.
	2013 Credit Facility
	On August 9, 2013, we, through our wholly owned subsidiary, Engility Corporation, entered into a credit facility among the Company, Engility Corporation, Bank of America, N.A. (as administrative agent, swing line lender and letter of credit issuer) and each of the several lenders from time to time party thereto (the 2013 Credit Facility). The 2013 Credit Facility, which replaced the 2012 Credit Facility, provides for (1) a $200 million term loan facility maturing on August 9, 2018, and (2) a $250 million revolving credit facility that terminates on August 9, 2018, with a $50 million letter of credit sublimit and a $25 million swing line loan sublimit. The 2013 Credit Facility also contains an accordion feature that permits us to arrange with the lenders for the provision of up to $150 million in additional commitments. In conjunction with replacing our 2012 Credit Facility, we expensed $4 million in previously capitalized bank fees relating to the 2012 Credit Facility.
	Maturity, Interest Rate and Fees. All borrowings under the 2013 Credit Facility bear interest at a variable rate per annum equal to an applicable margin, plus, at our option (other than for swing line loans), either (1) a base rate determined by reference to the highest of (a) the prime rate of Bank of America, N.A., (b) the federal funds effective rate plus 0.50% and (c) a LIBOR rate determined by reference to the cost of funds for U.S. dollar deposits for the interest period of one month plus 1.00% or (2) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for the interest period relevant to such borrowing. All swing line loans bear interest at a variable rate per annum equal to an applicable margin, plus a base rate determined as described in the immediately preceding sentence. The applicable margins for the borrowings under the 2013 Credit Facility depend on the consolidated leverage ratio of Engility Holdings, Inc., Engility Corporation and its subsidiaries. The applicable LIBOR margin varies between 2.25% and 3.25%, and the applicable base rate margin varies between 1.25% and 2.25%.
	Amortization and Final Maturity. Beginning December 31, 2013, we are required to make scheduled quarterly payments equal to 1.25% of the original principal amount of the term loan facility, or $2.5 million per quarter, with the balance to be due and payable on the fifth anniversary of the closing date, August 9, 2018.
	Guarantees and Security. All obligations under the 2013 Credit Facility are unconditionally guaranteed by Engility Holdings, Inc. and certain of our direct or indirect wholly owned domestic subsidiaries. All obligations under the 2013 Credit Facility, and the guarantees of those obligations, are secured, subject to certain exceptions, by substantially all of the assets of Engility Corporation and the assets of Engility Holdings, Inc. and Engility Corporation’s subsidiary guarantors.
	Covenants and Events of Default. The 2013 Credit Facility contains a number of covenants that, among other things and subject to certain exceptions, restrict our ability to incur additional indebtedness; pay dividends on our capital stock or redeem, repurchase or retire our capital stock or other indebtedness; make investments, loans and acquisitions; create restrictions on the payment of dividends or other amounts by Engility Corporation’s subsidiaries to Engility Corporation or to any guarantor; engage in transactions with Engility Corporation’s affiliates; sell assets; materially alter the business Engility Corporation conducts; consolidate, merge, dissolve or wind up our business; incur liens; and prepay or amend subordinated or unsecured debt. Engility Holdings, Inc. is also subject to a passive holding company covenant that limits our ability to engage in certain activities. In addition, the 2013 Credit Facility requires that Engility Corporation maintain a minimum consolidated debt service coverage ratio of no less than 1.25:1.00 as of the end of any fiscal quarter of Engility Corporation, and a maximum consolidated leverage ratio of no greater than 3.50:1.00 as of the end of any fiscal quarter of Engility Corporation, with step-downs to 3.25:1.00 beginning with the fiscal quarter ending December 31, 2014 and 3.00:1.00 beginning with the fiscal quarter ending December 31, 2015. We believe our most restrictive covenant under the 2013 Credit Facility is the maximum consolidated leverage ratio, which as of September 27, 2013 was 1.60:1.00. The 2013 Credit Facility also contains customary provisions relating to the events of default. As of September 27, 2013, we were in compliance with the covenants under the 2013 Credit Facility.
	The carrying value of the principal amount outstanding under term loan, which approximates fair value, is $200 million. The fair value of the term loan is based on interest rates prevailing on debt with substantially similar risks, terms and maturities and is considered to be a Level 3 input. measured under U.S. GAAP hierarchy. We currently have $30 million outstanding on our revolving line of credit and our availability under the revolving portion of the 2013 Credit Facility was $218 million as of September 27, 2013, with $2 million outstanding under letters of credit.

Discontinued_Operations

Discontinued Operations	9 Months Ended
	Sep. 27, 2013
Discontinued Operations And Disposal Groups [Abstract]	'
Discontinued Operations	'
	7	Discontinued Operations
	The Global Security Solutions (GSS) business unit, which had been historically managed by us, was retained by L-3 as part of its National Security Solutions business in connection with the spin-off. The GSS results of operations are presented as discontinued operations in the unaudited consolidated and combined financial statements for the three and nine months ended September 28, 2012.

Realignment_Costs

Realignment Costs	9 Months Ended
Realignment Costs	Sep. 27, 2013
Restructuring And Related Activities [Abstract]	'
Realignment Costs	'
	8	Realignment Costs
	On September 12, 2012, we announced a strategic realignment of our organizational structure and a streamlining of our operations, effective January 1, 2013. This strategic realignment included a reduction of our workforce through a voluntary separation of employment program and additional reductions in our workforce.
	The activity and balance of the strategic realignment liability accounts for the nine months ended September 27, 2013 were as follows:


			Severance			Professional			Total
			and Related			and Other
			Costs			Fees
	Balance as of January 1, 2013		$	4,234		$	1,036		$	5,270
	Additions			—			—			—
	Adjustments			(544	)		—			(544	)
	Cash payments			(3,690	)		(1,036	)		(4,726	)

	Balance as of September 27, 2013		$	—		$	—		$	—

	These expenses are contained within the selling, general and administrative expense line in the accompanying unaudited consolidated and combined statement of operations for the nine months ended September 27, 2013.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 27, 2013
Commitments And Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	9	Commitments and Contingencies
	Procurement Regulations: Most of our revenue is generated from providing services and products under legally binding agreements or contracts with U.S. government and foreign government customers. U.S. government contracts are subject to extensive legal and regulatory requirements, and from time to time, agencies of the U.S. government investigate whether such contracts were and are being conducted in accordance with these requirements.
	We are currently cooperating with the U.S. government on several investigations from which civil or administrative proceedings have or could result and give rise to fines, penalties, compensatory and treble damages, restitution and/or forfeitures. We do not currently anticipate that any of these investigations will have a material adverse effect, individually or in the aggregate, on our consolidated financial position, results of operations or cash flows. However, under U.S. government regulations, our indictment by a federal grand jury, or an administrative finding against us as to our present responsibility to be a U.S. government contractor or subcontractor, could result in our suspension for a period of time from eligibility for awards of new government contracts or task orders or in a loss of export privileges. A conviction, or an administrative finding against us that satisfies the requisite level of seriousness, could result in debarment from contracting with the U.S. government for a specified term, which would have a materially adverse effect on our consolidated financial position, results of operations and cash flows.
	In addition, all of our U.S. government contracts: (1) are subject to audit and various pricing and cost controls, (2) include standard provisions for termination for the convenience of the U.S. government or for default, and (3) are subject to cancellation if funds for contracts become unavailable. Foreign government contracts generally include comparable provisions relating to terminations for convenience and default, as well as other procurement clauses relevant to the foreign government.
	Litigation Matters: We are also subject to litigation, proceedings, claims or assessments and various contingent liabilities incidental to our businesses. Furthermore, in connection with certain business acquisitions, we have assumed some or all claims against, and liabilities of, such acquired businesses, including both asserted and unasserted claims and liabilities.
	In accordance with the accounting standard for contingencies, we record a liability when management believes that it is both probable that a liability has been incurred and we can reasonably estimate the amount of the loss. Generally, the loss is recorded for the amount we expect to resolve the liability. The estimated amounts of liabilities recorded for pending and threatened litigation are recorded in other current liabilities in the balance sheets. Amounts recoverable from insurance contracts or third parties are recorded as assets when deemed probable. At September 27, 2013 and December 31, 2012, we did not record any amounts for recoveries from insurance contracts or third parties in connection with the amount of liabilities recorded for pending and threatened litigation. Legal defense costs are expensed as incurred. We believe we have recorded adequate provisions for our litigation matters. We review these provisions quarterly and adjust these provisions to reflect the effect of negotiations, settlements, rulings, advice of legal counsel and other information and events pertaining to a particular matter.
	Afghanistan Civil Investigation. On August 30, 2010, the Defense Criminal Investigative Service executed a warrant for documents related to the billing of travel time by certain of our employees working in Afghanistan. The supporting affidavit indicated that this was related to a civil qui tam action filed in the U.S. District Court for the Southern District of Ohio, which alleged that these employees improperly charged their travel time in connection with paid time off and weekend leave. On June 26, 2013, we reached an agreement in principle with the DOJ and the Relator to settle the matter for approximately $3 million plus the Relator’s reasonable attorney’s fees, with no admission of liability by the Company.

Income_Taxes

Income Taxes	9 Months Ended
	Sep. 27, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	10	Income Taxes
	The effective tax rate for the three and nine months ended September 27, 2013 was 38.2% and 38.8%, respectively.
	During the three months and nine months ended September 28, 2012, we treated certain nondeductible spin-off-related transaction costs as discrete charges for income tax purposes, which resulted in $1 million and $2 million of discrete income tax expense, respectively, for those periods.
	Our effective income tax rate including the impact of the goodwill impairment charge prior to discrete items was (0.3%) and (6.5%) for the three months and nine months ended September 28, 2012, respectively. Income tax expense including discrete items and the goodwill impairment charge was $1 million and $25 million for the three months and nine months ended September 28, 2012, respectively

Basis_of_Presentation_Policies

Basis of Presentation (Policies)	9 Months Ended
Basis of Presentation (Policies)	Sep. 27, 2013
Organization Consolidation And Presentation Of Financial Statements [Abstract]	'
Spin-Off from L-3	'
	Spin-Off from L-3: On July 17, 2012, L-3 Communications Holdings, Inc. completed the spin-off of Engility Holdings, Inc. For the periods prior to July 17, 2012, Engility Holdings and its current subsidiaries were direct or indirect subsidiaries of L-3 Communications Holdings. Unless the context indicates otherwise, (i) references to Engility, the Company, we, us or our refer to Engility Holdings, Inc. and its subsidiaries and (ii) references to L-3 refer to L-3 Communications Holdings, Inc. and its subsidiaries.
	Effective as of 5:00 p.m., New York time, on July 17, 2012 (the Distribution Date), our common stock was distributed, on a pro rata basis, to L-3’s stockholders of record as of the close of business on July 16, 2012 (the Record Date). On the Distribution Date, each holder of L-3 common stock received one share of our common stock for every six shares of L-3 common stock held on the Record Date. The spin-off was completed pursuant to a Distribution Agreement and several other agreements with L-3 related to the spin-off, including an Employee Matters Agreement, a Tax Matters Agreement, a Transition Services Agreement and two Master Supply Agreements. These agreements govern the relationship between us and L-3 following the spin-off and provide for the allocation of various assets, liabilities, rights and obligations. These agreements also include arrangements for transition services to be provided by L-3 to Engility. For a discussion of each agreement, see the section entitled “Certain Relationships and Related Party Transactions — Agreements with L-3 Related to the Spin-Off” in our Proxy Statement for the Annual Meeting of Stockholders held on May 23, 2013, as filed with the U.S. Securities and Exchange Commission (the SEC) on April 12, 2013. We paid $335 million as a cash dividend to L-3 on the Distribution Date.
	Our Registration Statement on Form 10 was declared effective by the SEC on July 2, 2012, and our common stock began “regular-way” trading on the New York Stock Exchange on July 18, 2012 under the symbol “EGL.”
Description of Business	'
	Description of Business: Engility, through its predecessors, has provided mission-critical services to the U.S. government for over four decades. Our customers include the U.S. Department of Defense (DoD), U.S. Department of Justice (DoJ), U.S. Agency for International Development (USAID), U.S. Department of State (DoS), Federal Aviation Administration (FAA), Department of Homeland Security (DHS), and allied foreign governments. We attribute the strength of our customer relationships to our singular focus on services, our industry-leading capabilities in program planning and management, superior past performance, and the experience of our people and their commitment to our customers’ missions. As of September 27, 2013, we employed approximately 7,000 individuals globally and operated in over 40 countries. We are led by a seasoned executive team, which is composed of industry and government veterans.
	We provide our service offerings in six key areas: (i) specialized technical consulting; (ii) program and business support services; (iii) engineering and technology lifecycle support; (iv) information technology modernization and sustainment; (v) supply chain services and logistics management; and (vi) training and education.
Principles of Consolidation and Combination and Basis of Presentation	'
	Principles of Consolidation and Combination and Basis of Presentation: The unaudited consolidated and combined financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) for interim financial information and in accordance with Article 10 of Regulation S-X of the SEC and reflect the financial position, results of operations and cash flows of our businesses. Accordingly, they do not include all of the disclosures required by U.S. GAAP for a complete set of annual audited financial statements.
	The accompanying financial information should be read in conjunction with the consolidated financial statements and notes contained in our Annual Report on Form 10-K filed with the SEC for the year ended December 31, 2012 (2012 Form 10-K). In the opinion of management, all adjustments (consisting of normal and recurring adjustments) considered necessary for a fair statement of the results for the interim periods presented have been included. The results of operations for the interim periods are not necessarily indicative of results for the full year.
	Our accompanying unaudited consolidated and combined financial statements, for the periods prior to the spin-off, were derived from the accounting records of L-3 as if we operated on a stand-alone basis. The unaudited combined statements of operations include expense allocations for the corporate functions provided to us by L-3 prior to the Distribution Date, including, but not limited to, executive management, finance, legal, human resources, employee benefits administration, treasury, tax, internal audit, information technology, communications, ethics and compliance, insurance, and stock-based compensation. These expenses were allocated to us on the basis of direct usage when identifiable, with the remainder allocated on the basis of revenue or headcount. We believe that these allocations have been made on a consistent basis and are a reasonable reflection of the utilization of the services received by, or benefits provided to, us during the periods presented.
	Following our spin-off from L-3, we perform these functions using internal resources and purchased services, some of which are provided by L-3 during a transitional period pursuant to the Transition Services Agreement.
	Transactions prior to the spin-off between us and L-3 were considered to be effectively settled for cash at the time the transaction was recorded, and therefore are included as financing activities in the unaudited consolidated and combined statements of cash flows.
	Consistent with L-3’s centralized approach to cash management and financing its operations, prior to the spin-off, the majority of our cash receipts were transferred to L-3 daily and L-3 funded our working capital and capital expenditure requirements as needed. Cash transfers to and from L-3’s cash management accounts were reflected as a component of prior parent company investment in the unaudited consolidated and combined balance sheets. Net changes to the prior parent company investment for the period are reflected in the net transfers from prior parent in cash flows from financing activities section of the accompanying statement of cash flows. Following the spin-off, we have financed our operations primarily through operating cash flow and the revolving portion of the 2012 Credit Facility, and currently, the 2013 Credit Facility (each as defined in Note 6 below), as needed.
	See Note 4 for a further description of the transactions between us and L-3.
Non-controlling Interest	'
Non-controlling Interest	Non-controlling Interest: Engility holds a 50.1% majority interest in Forfeiture Support Associates J.V. (FSA). The results of operations of FSA are included in Engility’s Consolidated and Combined Statements of Operations from the date control was obtained. The non-controlling interest reported on the Consolidated and Combined Balance Sheets represents the portion of FSA’s equity that is attributable to the non-controlling interest.
Accounting Estimates	'
Accounting Estimates	Accounting Estimates: The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates using assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting periods. The most significant of these estimates relate to the recoverability, useful lives and valuation of identifiable intangible assets and goodwill, income tax contingencies and revenue and expenses for certain revenue arrangements. Actual amounts will differ from these estimates and could differ materially.
Change in Operating and Reportable Segments	'
Change in Operating and Reportable Segments	Change in Operating and Reportable Segments: Prior to 2013, we operated in two segments. Effective January 1, 2013, we operate as one segment. Accordingly, all segment disclosure has been eliminated as it is no longer relevant based on the Company’s current operating and reporting structure.
Reporting Periods	'
Reporting Periods	Reporting Periods: Our fiscal year begins on January 1 and ends on December 31. Our first three fiscal quarters end on the 13th Friday after the first day of the quarter and the fourth quarter ends on December 31.
Revision to Costs and Expenses	'
Revision to Costs and Expenses	Revision to Costs and Expenses: As previously disclosed, during the process of finalizing the financial statements for the fiscal year ended December 31, 2012, we determined that during the three months ended March 30, 2012, June 29, 2012 and September 28, 2012, we improperly classified certain amounts in cost of revenue that were selling, general and administrative in nature. We have therefore adjusted the presentation in this Form 10-Q to correctly present these amounts as selling, general and administrative expenses. We have assessed the impact of the adjustments on the statements of operations and determined that the periods were not materially misstated. These changes did not impact the balance sheets or statements of cash flows. The revision decreased cost of revenue, with a corresponding increase to selling, general and administrative expenses of $2,498, $2,195 and $2,084 for the three months ended March 30, 2012, June 29, 2012 and September 28, 2012, respectively. There was no impact to operating income due to this revision.
Earnings Per Share	'

	Earnings per Share: For periods prior to the spin-off, basic and diluted earnings per share (EPS) was calculated using 16 million shares of our common stock that were distributed to L-3 shareholders on July 17, 2012. For periods after the spin-off, basic EPS is computed by dividing net income by the weighted average number of common shares outstanding for the period. Diluted EPS reflects potential dilution that could occur if securities to issue common stock were exercised or converted into common stock. Diluted EPS includes the effect of the employee stock purchase plan, restricted stock units, and stock options calculated using the treasury stock method. For the three and nine months ended September 27, 2013, 0 shares and 12,355 shares, respectively, were not included in diluted EPS due to their anti-dilutive effects. For the three and nine months ended September 28, 2012, 552,667 shares and 184,222 shares, respectively, were not included in diluted EPS due to their anti-dilutive effects.

Basis_of_Presentation_Tables

Basis of Presentation (Tables)	9 Months Ended
Basis of Presentation (Tables)	Sep. 27, 2013
Organization Consolidation And Presentation Of Financial Statements [Abstract]	'
Earnings Per Share	'
	For the three and nine months ended September 27, 2013, 0 shares and 12,355 shares, respectively, were not included in diluted EPS due to their anti-dilutive effects. For the three and nine months ended September 28, 2012, 552,667 shares and 184,222 shares, respectively, were not included in diluted EPS due to their anti-dilutive effects.


		Three Months Ended					Nine Months Ended
		September 27,		September 28,			September 27,		September 28,
		2013		2012			2013		2012
		(amounts in thousands, except per share amounts)
	Net income (loss) attributable to Engility from continuing operations less noncontrolling interest	$	12,008	$	(419,997	)	$	38,848	$	(390,696	)

	Net loss attributable to Engility from discontinued operations		—		(308	)		—		(626	)

	Net income (loss) attributable to Engility	$	12,008	$	(420,305	)	$	38,848	$	(391,322	)

	Weighted average number of shares outstanding – Basic		16,915		16,291			16,855		16,176
	Dilutive effect of share-based compensation outstanding after application of the treasury stock method		855		—			737		—

	Weighted average number of shares – Diluted		17,770		16,291			17,592		16,176

	Earnings (loss) per share allocable to Engility Holdings, Inc. common shareholders – Basic
	Net income (loss) per share from continuing operations less noncontrolling interest	$	0.71	$	(25.78	)	$	2.3	$	(24.15	)

	Net loss per share from discontinued operations	$	—	$	(0.02	)	$	—	$	(0.04	)

	Net income (loss) per share attributable to Engility	$	0.71	$	(25.80	)	$	2.3	$	(24.19	)

	Earnings (loss) per share allocable to Engility Holdings, Inc. common shareholders – Diluted
	Net income (loss) per share from continuing operations less noncontrolling interest	$	0.68	$	(25.78	)	$	2.21	$	(24.15	)

	Net loss per share from discontinued operations	$	—	$	(0.02	)	$	—	$	(0.04	)

	Net income (loss) per share attributable to Engility	$	0.68	$	(25.80	)	$	2.21	$	(24.19	)

Receivables_Tables

Receivables (Tables)	9 Months Ended
Receivables (Tables)	Sep. 27, 2013
Receivables [Abstract]	'
Components of Contract Receivables	'
	The components of contract receivables are presented in the table below.


		As of			As of
		September 27,			December 31,
		2013			2012
	Billed receivables	$	153,313		$	172,042
	Unbilled receivables		164,870			198,248
	Allowance for doubtful accounts		(1,695	)		(4,054	)

	Total receivables, net	$	316,488		$	366,236

Goodwill_and_Identifiable_Inta1

Goodwill and Identifiable Intangible Assets (Tables)	9 Months Ended
Goodwill and Identifiable Intangible Assets (Tables)	Sep. 27, 2013
Goodwill And Intangible Assets Disclosure [Abstract]	'
Information on Identifiable Intangible Assets	'
	Information on our identifiable intangible assets that are subject to amortization is presented in the table below.


					September 27, 2013						December 31, 2012
		Weighted			Gross		Accumulated		Net		Gross		Accumulated		Net
		Average			Carrying		Amortization		Carrying		Carrying		Amortization		Carrying
		Amortization			Amount				Amount		Amount				Amount
		Period
			(in years	)
	Customer contractual relationships		28		$	178,630	$	84,268	$	94,362	$	178,630	$	77,762	$	100,868
	Technology		—			29,259		29,259		—		29,259		29,259		—
	Favorable leasehold interests		10			1,827		1,803		24		1,827		1,766		61

	Total				$	209,716	$	115,330	$	94,386	$	209,716	$	108,787	$	100,929

Amortization Expense Recorded for Identifiable Intangible Assets	'
	Our amortization expense recorded for our identifiable intangible assets is presented in the table below.


		Three Months Ended					Nine Months Ended
		September 27,			September 28,		September 27,		September 28,
		2013			2012		2013		2012
	Amortization expense	$	2,181		$	3,276	$	6,542	$	9,828

Related_Party_Transactions_and1

Related Party Transactions and Parent Company Investment (Tables)	9 Months Ended
	Sep. 27, 2013
Related Party Transactions [Abstract]	'
Components of Net Transfers (to)/from Prior Parent	'
	The components of our net transfers (to)/from prior parent are presented in the table below.


		Three Months Ended				Nine Months Ended
		September 27,		September 28,		September 27,		September 28,
		2013		2012		2013		2012
	Intercompany revenue and purchases, net	$	—	$	—	$	—	$	(86,019	)
	Cash pooling and general financing activities		—		—		—		(34,404	)
	Corporate allocations		—		1,322		—		37,748
	Income taxes		—		—		—		33,282
	Net transfers related to discontinued operations		—		14,535		—		23,760

	Total net transfers from prior parent	$	—	$	15,857	$	—	$	(25,633	)

Realignment_Costs_Tables

Realignment Costs (Tables)	9 Months Ended
Realignment Costs (Tables)	Sep. 27, 2013
Restructuring And Related Activities [Abstract]	'
Summary of Realignment Cost	'
	The activity and balance of the strategic realignment liability accounts for the nine months ended September 27, 2013 were as follows:


		Severance			Professional			Total
		and Related			and Other
		Costs			Fees
	Balance as of January 1, 2013	$	4,234		$	1,036		$	5,270
	Additions		—			—			—
	Adjustments		(544	)		—			(544	)
	Cash payments		(3,690	)		(1,036	)		(4,726	)

	Balance as of September 27, 2013	$	—		$	—		$	—

Basis_of_Presentation_Addition

Basis of Presentation - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended				9 Months Ended		12 Months Ended
	Jul. 17, 2012	Sep. 27, 2013	Sep. 28, 2012	Jun. 29, 2012	Mar. 30, 2012	Sep. 27, 2013	Sep. 28, 2012	Dec. 31, 2012
		Country				Segment		Segment
		Employees				Country
						Employees
Debt Disclosure [Abstract]	'	'	'	'	'	'	'	'
Description of exchange of common shares ratio	'On the Distribution Date, each holder of L-3 common stock received one share of our common stock for every six shares of L-3 common stock held on the Record Date	'	'	'	'	'	'	'
Cash dividend paid to L-3	$335,000,000	'	'	'	'	'	'	'
Number of individuals employed	'	7,000	'	'	'	7,000	'	'
Number of countries operating in over	'	40	'	'	'	40	'	'
Increase in non-controlling interest ownership	'	50.10%	'	'	'	50.10%	'	'
Number of segments	'	'	'	'	'	1	'	2
Decrease in Cost of Revenue	'	'	2,084,000	2,195,000	2,498,000	'	'	'
Increase to selling, general and administrative expenses	'	'	$2,084,000	$2,195,000	$2,498,000	'	'	'
Number of shares used to calculate shares outstanding prior to spin-out	'	'	'	'	'	'	16,000,000	'
Anti-dilutive shares	'	0	552,667	'	'	12,355	184,222	'

Basis_of_Presentation_Earnings

Basis of Presentation - Earnings Per Share (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 27, 2013	Sep. 28, 2012	Sep. 27, 2013	Sep. 28, 2012
Earnings Per Share [Abstract]	'	'	'	'
Net income (loss) attributable to Engility from continuing operations less noncontrolling interest	$12,008	($419,997)	$38,848	($390,696)
Net loss attributable to Engility from discontinued operations	'	-308	'	-626
Net income (loss) attributable to Engility	$12,008	($420,305)	$38,848	($391,322)
Weighted average number of shares outstanding - Basic	16,915	16,291	16,855	16,176
Dilutive effect of share-based compensation outstanding after application of the treasury stock method	855	'	737	'
Weighted average number of shares - Diluted	17,770	16,291	17,592	16,176
Earnings (loss) per share allocable to Engility Holdings, Inc. common shareholders - Basic	'	'	'	'
Net income (loss) per share from continuing operations less noncontrolling interest	$0.71	($25.78)	$2.30	($24.15)
Net loss per share from discontinued operations	'	($0.02)	'	($0.04)
Net income (loss) per share attributable to Engility	$0.71	($25.80)	$2.30	($24.19)
Earnings (loss) per share allocable to Engility Holdings, Inc. common shareholders - Diluted	'	'	'	'
Net income (loss) per share from continuing operations less noncontrolling interest	$0.68	($25.78)	$2.21	($24.15)
Net loss per share from discontinued operations	'	($0.02)	'	($0.04)
Net income (loss) per share attributable to Engility	$0.68	($25.80)	$2.21	($24.19)

Receivables_Components_of_Cont

Receivables - Components of Contract Receivables (Detail) (USD $)	Sep. 27, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 27, 2013	Dec. 31, 2012
Receivables [Abstract]	'	'
Billed receivables	$153,313	$172,042
Unbilled receivables	164,870	198,248
Allowance for doubtful accounts	-1,695	-4,054
Total receivables, net	$316,488	$366,236

Goodwill_and_Identifiable_Inta2

Goodwill and Identifiable Intangible Assets - Additional Information (Detail) (USD $)	Sep. 27, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 27, 2013	Dec. 31, 2012
Goodwill And Intangible Assets Disclosure [Abstract]	'	'
Goodwill	$477,604	$477,604

Goodwill_and_Identifiable_Inta3

Goodwill and Identifiable Intangible Assets - Information on Identifiable Intangible Assets (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 27, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	$209,716	$209,716
Accumulated Amortization	115,330	108,787
Net Carrying Amount	94,386	100,929
Customer Contractual Relationships [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Weighted Average Amortization Period (in years)	'28 years	'
Gross Carrying Amount	178,630	178,630
Accumulated Amortization	84,268	77,762
Net Carrying Amount	94,362	100,868
Technology [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Weighted Average Amortization Period (in years)	'0 years	'
Gross Carrying Amount	29,259	29,259
Accumulated Amortization	29,259	29,259
Net Carrying Amount	'	'
Favorable Leasehold Interests [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Weighted Average Amortization Period (in years)	'10 years	'
Gross Carrying Amount	1,827	1,827
Accumulated Amortization	1,803	1,766
Net Carrying Amount	$24	$61

Goodwill_and_Identifiable_Inta4

Goodwill and Identifiable Intangible Assets - Amortization Expense Recorded for Identifiable Intangible Assets (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 27, 2013	Sep. 28, 2012	Sep. 27, 2013	Sep. 28, 2012
Goodwill And Intangible Assets Disclosure [Abstract]	'	'	'	'
Amortization expense	$2,181	$3,276	$6,542	$9,828

Related_Party_Transactions_and2

Related Party Transactions and Parent Company Investment - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 27, 2013	Sep. 28, 2012	Sep. 27, 2013	Sep. 28, 2012
Related Party Transactions [Abstract]	'	'	'	'
Corporate expenses	'	$1,322	'	$15,322
Direct corporate expenses	'	'	'	22,426
Corporate allocations	'	1,322	'	37,748
Revenue earned from affiliated entities	'	$4,888	'	$100,035

Related_Party_Transactions_and3

Related Party Transactions and Parent Company Investment - Components of Net Transfers (to)/from Prior Parent (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 27, 2013	Sep. 28, 2012	Sep. 27, 2013	Sep. 28, 2012
Related Party Transactions [Abstract]	'	'	'	'
Intercompany revenue and purchases, net	'	'	'	($86,019)
Cash pooling and general financing activities	'	'	'	-34,404
Corporate allocations	'	1,322	'	37,748
Income taxes	'	'	'	33,282
Net transfers related to discontinued operations	'	14,535	'	23,760
Total net transfers from prior parent	'	$15,857	'	($25,633)

ShareBased_Compensation_Additi

Share-Based Compensation - Additional Information (Detail) (USD $)

9 Months Ended

Sep. 27, 2013

Jul. 17, 2012

Sep. 27, 2013

Jul. 17, 2012

Sep. 28, 2012

Sep. 27, 2013

Sep. 28, 2012

Sep. 27, 2013

2013 Long Term Incentive Plan [Member]

Stock Options [Member]

Restricted Stock Units [Member]

Stock Option [Member]

Restricted Stock Units Rsus Cliff Vest [Member]

Performance Shares [Member]

Employees [Member]

Employees and Director [Member]

Director [Member]

2013 Long Term Incentive Plan [Member]

Minimum [Member]

Maximum [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Equity awards converted into options

284,594

Equity awards converted into RSUs

684,895

Options granted

53,057

Expiration period of options granted from date of grant

'10 years

Vesting period

'1 year

'3 years

'1 year

'3 years

Weighted average grant date fair value

$11.49

Share-based compensation issued

18,498

154,066

362,274

200,745

305,020

Weighted average grant date fair value

$24.32

$16.83

$17.68

$24.04

$28.24

Options granted

RSUs granted that vest ratably over the term of three years from the grant date

101,670

RSUs granted that cliff vest on the third anniversary of the grant date.

99,075

Restricted stock vest ratable term

'3 years

Stock vest on first anniversary

25.00%

Stock vest on second anniversary

25.00%

Stock vest on third anniversary

50.00%

Common stock vested and delivered

0.00%

200.00%

Debt_Additional_Information_De

Debt - Additional Information (Detail) (USD $)	1 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Aug. 09, 2013	Jul. 17, 2012	Sep. 27, 2013
Debt Instrument [Line Items]	'	'	'
Total Credit Facility	'	$400	'
Term loan	'	335	200
Consolidated debt service coverage ratio financial maintenance covenant	'	'	3.25
Consolidated debt service coverage ratio financial maintenance covenant	'	'	3
Consolidated debt leverage ratio	'	'	1.6
Line of credit outstanding	'	'	30
Amount outstanding under letters of credit	'	'	2
Minimum [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Consolidated debt service coverage ratio financial maintenance covenant	'	'	1.25
Maximum [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Consolidated debt service coverage ratio financial maintenance covenant	'	'	3.5
2013 Credit Facility [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Total Credit Facility	'	'	218
Federal funds effective rate	0.50%	0.50%	'
LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits	'Plus 1.00%	'Not less than 1.25% plus 1.00%	'
Debt Instrument, Interest Rate, Increase (Decrease)	'	2.25%	'
Quarterly payment of term loan, percentage	1.25%	3.75%	'
Debt Instrument, Periodic Payment	2.5	12.6	'
Letter of credit sublimit	50	'	'
Swing line loan sublimit	25	'	'
Additional commitments	150	'	'
Amount of previously capitalized bank fees expensed	'	'	4
2013 Credit Facility [Member] \| Minimum [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
LIBOR margin	2.25%	'	'
Base rate margin	1.25%	'	'
2013 Credit Facility [Member] \| Maximum [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
LIBOR margin	3.25%	'	'
Base rate margin	2.25%	'	'
Senior Secured Term Loan Facility [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Total Credit Facility	'	335	'
Senior Secured Term Loan Facility [Member] \| 2013 Credit Facility [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Total Credit Facility	200	'	'
Maturity period of term loan	'	'	9-Aug-18
Senior Secured Revolving Credit Facility [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Total Credit Facility	'	65	'
Senior Secured Revolving Credit Facility [Member] \| 2013 Credit Facility [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Total Credit Facility	$250	'	'
Maturity period of term loan	'	'	9-Aug-18

Realignment_Costs_Summary_of_R

Realignment Costs - Summary of Realignment Cost (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 27, 2013
Restructuring Cost and Reserve [Line Items]	'
Beginning Balance	$5,270
Additions	'
Adjustments	-544
Cash payments	-4,726
Ending Balance	'
Severance and Related Costs [Member]	'
Restructuring Cost and Reserve [Line Items]	'
Beginning Balance	4,234
Additions	'
Adjustments	-544
Cash payments	-3,690
Ending Balance	'
Professional and Other Fees [Member]	'
Restructuring Cost and Reserve [Line Items]	'
Beginning Balance	1,036
Additions	'
Adjustments	'
Cash payments	-1,036
Ending Balance	'

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Detail) (USD $)	1 Months Ended
In Millions, unless otherwise specified	Jun. 26, 2013
Commitments And Contingencies Disclosure [Abstract]	'
Settlement expense	$3

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Sep. 27, 2013	Sep. 28, 2012	Sep. 27, 2013	Sep. 28, 2012
Income Tax Disclosure [Abstract]	'	'	'	'
Effective income tax rate	38.20%	0.30%	38.80%	6.50%
Discrete income tax expense	'	$1,000,000	'	$2,000,000
Income tax expense including discrete items	$8,699,000	$1,378,000	$27,344,000	$24,997,000