Subsequent Events (Notes)	11 Months Ended
Subsequent Events (Notes)	Jan. 01, 2016
Subsequent Event [Line Items]
Subsequent Events	Subsequent Events: Lockheed Martin Transaction On January 26, 2016, Leidos Holdings, Inc. announced that it had entered into a definitive agreement (the "Merger Agreement"), dated January 26, 2016, with Lockheed Martin Corporation ("Lockheed Martin"), Abacus Innovations Corporation, a Delaware corporation and a wholly owned subsidiary of Lockheed Martin ("Spinco"), and Lion Merger Co., a Delaware corporation and a wholly owned subsidiary of Leidos ("Merger Sub"), pursuant to which Leidos will combine with Lockheed Martin’s realigned Information Systems & Global Solutions business ("IS&GS") (collectively, the "ISGS Business") in a Reverse Morris Trust transaction (the "Lockheed Martin Transaction"). In connection with the Merger Agreement, Lockheed Martin and Spinco entered into a Separation Agreement dated January 26, 2016 (the "Separation Agreement"), pursuant to which Lockheed Martin will separate the ISGS Business. In the transactions contemplated by the Merger Agreement and the Separation Agreement, (i) Lockheed Martin will transfer the ISGS Business to Spinco, (ii) Lockheed Martin will distribute Spinco’s stock to Lockheed Martin’s stockholders, at Lockheed Martin’s option, by way of a pro rata dividend or an exchange offer (the "Distribution"), and (iii) Merger Sub will merge with and into Spinco, with Spinco as the surviving corporation (the "Merger") and a wholly owned subsidiary of Leidos. Upon consummation of the transactions contemplated by the Merger Agreement and the Separation Agreement, Lockheed Martin shareholders will receive approximately 77 million shares of Leidos common stock, which represent approximately 50.5% of the outstanding shares of Leidos common stock. Leidos’ existing stockholders will continue to hold the remaining approximately 49.5% of the outstanding shares of Leidos common stock. Prior to the Distribution, Spinco will incur third-party debt financing in an aggregate principal amount of approximately of $1.8 billion (the “Spinco Debt”) and immediately thereafter, Lockheed Martin will transfer the Spinco Assets to Spinco and Spinco will make a special cash payment to Lockheed Martin of $1.8 billion, subject to adjustment based on Spinco’s cash and working capital at the time of the Distribution (the "Special Cash Payment"). Spinco has entered into commitment letters with certain financial institutions to provide for the Spinco Debt. The Merger Agreement also provides that, prior to the Merger and subject to applicable law, Leidos shall declare and pay a special dividend of approximately $1.03 billion to its stockholders, conditioned on completion of the Merger. The special dividend will be funded by a combination of new borrowing and cash on hand. On January 26, 2016, the Company and certain financial institutions executed commitment letters pursuant to which the financial institutions have agreed to provide financing to Spinco to finance the amount of the Spinco Debt and to provide financing to Leidos to fund the special dividend of approximately $1.03 billion to its stockholders. The Company expects to incur significant integration and transaction costs in connection with the Lockheed Martin Transaction and related transactions during fiscal 2016 and fiscal 2017. Completion of the Lockheed Martin Transaction is expected in 2016. Consummation of the Lockheed Martin Transaction is subject to customary closing conditions, including, among others, (1) the consummation of the Separation and the Distribution in accordance with the Separation Agreement, (2) the expiration or termination of any applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, and the receipt of any necessary regulatory approvals in other jurisdictions, (3) the effectiveness of registration statements to be filed with the U.S. Securities and Exchange Commission ("SEC"), (4) the approval by Leidos’ stockholders of the issuance of Leidos common stock in the Merger (the "Share Issuance"), (5) the receipt by Lockheed Martin of an opinion of tax counsel as to the tax-free nature of the Distribution to Lockheed Martin and its stockholders and the receipt by Leidos and Lockheed Martin of opinions of their respective tax counsel regarding the treatment of the Merger as a "reorganization" for U.S. federal income tax purposes, and (6) the receipt by Leidos, Lockheed Martin and Spinco of solvency opinions customary in transactions of this type. There can be no assurance the Lockheed Martin Transaction will be consummated. See "Item 1A Risk Factors - We may be unable to satisfy the conditions or obtain the approvals required to complete the Lockheed Martin Transaction or such approvals may contain material restrictions or conditions." The Merger Agreement contains certain termination rights for both Lockheed Martin and Leidos and further provides that Leidos must pay to Lockheed Martin a termination fee of $150 million under certain circumstances. In addition, if the Merger Agreement is terminated because approval is not obtained at the Leidos stockholder meeting called for such purpose, Leidos has agreed to reimburse Lockheed Martin for its expenses up to a maximum amount of $37.5 million. In connection with the transactions contemplated by the Merger Agreement and the Separation Agreement, certain additional agreements have been or will be entered into, including, among others an employee matters agreement, a tax matters agreement, a transition services agreements, an intellectual property matters agreement, agreements relating to certain government contracts matters, supply agreements and certain real estate related agreements.
Leidos, Inc.
Subsequent Event [Line Items]
Subsequent Events	Subsequent Events: Lockheed Martin Transaction On January 26, 2016, Leidos Holdings, Inc. announced that it had entered into a definitive agreement (the "Merger Agreement"), dated January 26, 2016, with Lockheed Martin Corporation ("Lockheed Martin"), Abacus Innovations Corporation, a Delaware corporation and a wholly owned subsidiary of Lockheed Martin ("Spinco"), and Lion Merger Co., a Delaware corporation and a wholly owned subsidiary of Leidos ("Merger Sub"), pursuant to which Leidos will combine with Lockheed Martin’s realigned Information Systems & Global Solutions business ("IS&GS") (collectively, the "ISGS Business") in a Reverse Morris Trust transaction (the "Lockheed Martin Transaction"). In connection with the Merger Agreement, Lockheed Martin and Spinco entered into a Separation Agreement dated January 26, 2016 (the "Separation Agreement"), pursuant to which Lockheed Martin will separate the ISGS Business. In the transactions contemplated by the Merger Agreement and the Separation Agreement, (i) Lockheed Martin will transfer the ISGS Business to Spinco, (ii) Lockheed Martin will distribute Spinco’s stock to Lockheed Martin’s stockholders, at Lockheed Martin’s option, by way of a pro rata dividend or an exchange offer (the "Distribution"), and (iii) Merger Sub will merge with and into Spinco, with Spinco as the surviving corporation (the "Merger") and a wholly owned subsidiary of Leidos. Upon consummation of the transactions contemplated by the Merger Agreement and the Separation Agreement, Lockheed Martin shareholders will receive approximately 77 million shares of Leidos common stock, which represent approximately 50.5% of the outstanding shares of Leidos common stock. Leidos’ existing stockholders will continue to hold the remaining approximately 49.5% of the outstanding shares of Leidos common stock. Prior to the Distribution, Spinco will incur third-party debt financing in an aggregate principal amount of approximately of $1.8 billion (the “Spinco Debt”) and immediately thereafter, Lockheed Martin will transfer the Spinco Assets to Spinco and Spinco will make a special cash payment to Lockheed Martin of $1.8 billion, subject to adjustment based on Spinco’s cash and working capital at the time of the Distribution (the "Special Cash Payment"). Spinco has entered into commitment letters with certain financial institutions to provide for the Spinco Debt. The Merger Agreement also provides that, prior to the Merger and subject to applicable law, Leidos shall declare and pay a special dividend of approximately $1.03 billion to its stockholders, conditioned on completion of the Merger. The special dividend will be funded by a combination of new borrowing and cash on hand. On January 26, 2016, the Company and certain financial institutions executed commitment letters pursuant to which the financial institutions have agreed to provide financing to Spinco to finance the amount of the Spinco Debt and to provide financing to Leidos to fund the special dividend of approximately $1.03 billion to its stockholders. The Company expects to incur significant integration and transaction costs in connection with the Lockheed Martin Transaction and related transactions during fiscal 2016 and fiscal 2017. Completion of the Lockheed Martin Transaction is expected in 2016. Consummation of the Lockheed Martin Transaction is subject to customary closing conditions, including, among others, (1) the consummation of the Separation and the Distribution in accordance with the Separation Agreement, (2) the expiration or termination of any applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, and the receipt of any necessary regulatory approvals in other jurisdictions, (3) the effectiveness of registration statements to be filed with the U.S. Securities and Exchange Commission ("SEC"), (4) the approval by Leidos’ stockholders of the issuance of Leidos common stock in the Merger (the "Share Issuance"), (5) the receipt by Lockheed Martin of an opinion of tax counsel as to the tax-free nature of the Distribution to Lockheed Martin and its stockholders and the receipt by Leidos and Lockheed Martin of opinions of their respective tax counsel regarding the treatment of the Merger as a "reorganization" for U.S. federal income tax purposes, and (6) the receipt by Leidos, Lockheed Martin and Spinco of solvency opinions customary in transactions of this type. There can be no assurance the Lockheed Martin Transaction will be consummated. See "Item 1A Risk Factors - We may be unable to satisfy the conditions or obtain the approvals required to complete the Lockheed Martin Transaction or such approvals may contain material restrictions or conditions." The Merger Agreement contains certain termination rights for both Lockheed Martin and Leidos and further provides that Leidos must pay to Lockheed Martin a termination fee of $150 million under certain circumstances. In addition, if the Merger Agreement is terminated because approval is not obtained at the Leidos stockholder meeting called for such purpose, Leidos has agreed to reimburse Lockheed Martin for its expenses up to a maximum amount of $37.5 million. In connection with the transactions contemplated by the Merger Agreement and the Separation Agreement, certain additional agreements have been or will be entered into, including, among others an employee matters agreement, a tax matters agreement, a transition services agreements, an intellectual property matters agreement, agreements relating to certain government contracts matters, supply agreements and certain real estate related agreements.