Summary of Significant Accounting Policies	9 Months Ended
Summary of Significant Accounting Policies	Sep. 25, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies All references to the “Company” and “Kratos” refer to Kratos Defense & Security Solutions, Inc., a Delaware corporation, and its subsidiaries. (a) Basis of Presentation The information as of September 25, 2022 and for the three and nine months ended September 25, 2022 and September 26, 2021 is unaudited. The condensed consolidated balance sheet as of December 26, 2021 was derived from the Company’s audited consolidated financial statements at that date. In the opinion of management, these unaudited condensed consolidated financial statements include all adjustments, consisting of normal recurring adjustments, necessary for a fair presentation of the Company’s financial position, results of operations and cash flows for the interim periods presented. The results have been prepared in accordance with the instructions to Form 10-Q and do not necessarily include all information and footnotes necessary for presentation in accordance with accounting principles generally accepted in the U.S. (“GAAP”). These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and the related notes included in the Company’s audited annual consolidated financial statements for the fiscal year ended December 26, 2021, included in the Company’s Annual Report on Form 10-K filed with the U.S. Securities and Exchange Commission (the “SEC”) on February 22, 2022 (the “Form 10-K”). Interim operating results are not necessarily indicative of operating results expected in subsequent periods or for the year as a whole. (b) Principles of Consolidation The condensed consolidated financial statements include the accounts of the Company, its 100% owned subsidiaries and its majority owned subsidiary, KTT CORE, Inc., a Delaware corporation formerly known as KTT CORE, LLC (“KTT Core”), which is 90.05% owned by the Company. All inter-company transactions have been eliminated in consolidation. Noncontrolling interest consists of the remaining 9.95% interest in KTT Core. See Note 12 for further information related to the redeemable noncontrolling interest. (c) Fiscal Year The Company has a 52/53 week fiscal year ending on the last Sunday of the calendar year. The three month periods ended September 25, 2022 and September 26, 2021 consisted of 13-week periods. The nine month periods ended September 25, 2022 and September 26, 2021 consisted of 39-week periods. There are 52 calendar weeks in the fiscal years ending on December 25, 2022 and December 26, 2021. (d) Accounting Estimates There have been no significant changes in the Company’s accounting estimates for the nine months ended September 25, 2022 as compared to the accounting estimates described in the Annual Report on Form 10-K. (e) Fair Value of Financial Instruments The Company uses forward exchange contracts to manage foreign currency risks associated with certain transactions, specifically forecasted materials and salaries paid in foreign currencies. These derivative instruments are measured at fair value using observable market inputs such as forward rates. Based on these inputs, the derivative instruments are classified within Level 2 of the valuation hierarchy. At September 25, 2022, the derivative instruments were included in other current assets and other current liabilities on the Company's Condensed Consolidated Balance Sheets. The carrying amounts and the related fair values of the Company’s derivative instruments measured at fair value on a recurring basis at September 25, 2022, are presented in Note 15. There were no derivative instruments for forward exchange contracts at December 26, 2021. The carrying amounts and the related estimated fair values of the Company’s long-term debt financial instruments not measured at fair value on a recurring basis at September 25, 2022 and December 26, 2021 are presented in Note 10. The carrying value of all other financial instruments, including cash equivalents, accounts receivable, unbilled receivables, accounts payable, accrued expenses, billings in excess of cost and earnings on uncompleted contracts, income taxes payable and short-term debt, approximated their estimated fair values at September 25, 2022 and December 26, 2021 due to the short-term nature of these instruments.