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Nature of Operations and Basis of Presentation	12 Months Ended
	Jan. 03, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations and Basis of Presentation	Note 1—Nature of Operations and Basis of Presentation NATURE OF OPERATIONS AND BASIS OF PRESENTATION Leidos Holdings, Inc. (“Leidos”), a Delaware corporation, is a holding company whose direct 100%-owned subsidiary and principal operating company is Leidos, Inc. Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 48,000 global employees, Leidos’ customers include the U.S. Department of Defense (“DoD”), the U.S. Intelligence Community, the U.S. Department of Homeland Security, the Federal Aviation Administration, the Department of Veterans Affairs and many other U.S. civilian, state and local government agencies, foreign government agencies and commercial businesses. Unless indicated otherwise, references to “we,” “us” and “our” refer collectively to Leidos Holdings, Inc. and its consolidated subsidiaries. During fiscal 2024, we completed a realignment of our segment and reporting structure, which resulted in the identification of four reportable segments: National Security & Digital, Health & Civil, Commercial & International and Defense Systems. We commenced operating and reporting under the new organizational structure effective the first day of fiscal 2024. In addition, we separately present the unallocated costs associated with corporate functions as Corporate. As a result of this change, prior year segment results and disclosures have been recast to reflect the current reportable segment structure. We have an 88% controlling interest in Mission Support Alliance, LLC (“MSA”), a joint venture with Centerra Group, LLC. MSA’s contract ended on January 24, 2021. We also have a 53% controlling interest in Hanford Mission Integration Solutions, LLC (“HMIS”), the legal entity for the follow-on contract to MSA’s contract and a joint venture with Centerra Group, LLC and Parsons Government Services, Inc. We consolidate the financial results for MSA and HMIS into our consolidated financial statements. The consolidated financial statements also include the balances of all voting interest entities in which Leidos has a controlling voting interest (“subsidiaries”) and a variable interest entity (“VIE”) in which Leidos is the primary beneficiary. The consolidated balances of the VIE are not material to the consolidated financial statements for the periods presented. Intercompany accounts and transactions between consolidated companies have been eliminated in consolidation. Certain amounts in the prior year financial statements have been reclassified to conform to the current year presentation. We combined "Deferred tax liabilities" into "Other long-term liabilities" on the consolidated balance sheets.

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- Definition

The entire disclosure for the business description and basis of presentation concepts. Business description describes the nature and type of organization including but not limited to organizational structure as may be applicable to holding companies, parent and subsidiary relationships, business divisions, business units, business segments, affiliates and information about significant ownership of the reporting entity. Basis of presentation describes the underlying basis used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS).

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