Document and Entity Information (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 25, 2011	Nov. 30, 2012	Jun. 26, 2011
Document and Entity Information
Entity Registrant Name	KRATOS DEFENSE & SECURITY SOLUTIONS, INC.
Entity Central Index Key	0001069258
Document Type	10-K
Document Period End Date	Dec. 25, 2011
Amendment Flag	true
Amendment Description	This amendment (the “Amendment”) to the Annual Report on Form 10-K for the year ended December 25, 2011 (the “Original Form 10-K”), of Kratos Defense & Security Solutions, Inc. (the “Company”) which was originally filed with the Securities and Exchange Commission (“SEC”) on March 7, 2012, is being filed for the purpose of adding Note 17 - Condensed Consolidating Financial Statements (the “Guarantor Footnote”) to the consolidated financial statements filed with the Original Form 10-K in order to conform to the disclosure requirements of Rule 3-10 of Regulation S-X under the Securities Exchange Act of 1934, as amended (the “Exchange Act”). The purpose of the Guarantor Footnote is to provide additional supplementary financial information to the holders of the Company’s publicly-traded debt instruments. The addition of the footnote does not affect any other portion of the Company’s consolidated financial statements, including the Consolidated Balance Sheets, Statements of Operations, Statements of Stockholders’ Equity and Statements of Cash Flows. In addition, because the Company is reissuing its consolidated financial statements in order to add the Guarantor Footnote, SEC rules require that the Company retrospectively revise its consolidated financial statements to reflect certain events that occurred after the end of the fiscal year covered by the consolidated financial statements. Accordingly, the Company has revised its consolidated financial statements in accordance with FASB ASC Topic 205, Presentation of Financial Statements (“Topic 205”) to reflect the discontinuation of certain non-core businesses in June of 2012, an event which has already been reported in the Company’s Quarterly Reports on Form 10-Q for the fiscal quarters ended June 24, 2012 and September 30, 2012. As required by Rule 12b-15 under the Exchange Act, new certifications by the Company’s principal executive officer and principal financial officer are filed as exhibits to this Amendment under Item 15 of Part IV hereof. This Amendment solely modifies the following portions of the Original Form 10-K: Part II - Items 6, 7 and 9A; and Part IV - Item 15, and does not reflect any events occurring after December 25, 2011 or modify or update the disclosures in the Original Form 10-K that may have been affected by subsequent events, except as required to reflect the effects of the Company’s retrospective application of Topic 205 to reflect the discontinued operations and the addition of the Guarantor Footnote. All other Items of the Original Form 10-K are unaffected by this Amendment and such Items have not been included in this Amendment. This filing should be read in conjunction with the Original Form 10-K and the filings made by the Company with the SEC subsequent to the filing of the Original Form 10-K. The Company’s management has considered whether the addition of the Guarantor Footnote to conform to the requirements of Rule 3-10 of Regulation S-X under the Exchange Act, affects management’s conclusion, set forth in the Form 10-K, regarding the effectiveness, as of December 25, 2011, of the Company’s disclosure controls and procedures (as defined in Rule 13a-15(e) under the Exchange Act) and the Company’s internal control over financial reporting, (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act). Management continues to believe that, as of December 25, 2011: • The Company’s disclosure controls and procedures were functioning effectively to provide reasonable assurance that information required to be disclosed by the Company in its reports filed or submitted under the Exchange Act is (i) recorded, processed, summarized and reported within the time periods specified in SEC’s rules and forms and (ii) accumulated and communicated to the Company’s management, including its principal executive and principal financial officers, or persons performing similar functions, as appropriate to allow timely decisions regarding required disclosure; and • The Company’s internal control over financial reporting was effective based on the criteria on which it was evaluated, as described in the Form 10-K. Management’s Annual Report on Internal Control over Financial Reporting is included in this Form 10-K/A.
Current Fiscal Year End Date	--12-25
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float			$ 269.2
Entity Common Stock, Shares Outstanding		56,604,000
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	FY