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Nature of Operations and Basis of Presentation (Details)
employee in Thousands
 12 Months Ended
Jan. 03, 2025
employee
segment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Number of employees in global workforce | employee 48
Number of reportable segments | segment 4
Leidos, Inc.  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Controlling ownership interest (as percent) 100.00%
Mission Support Alliance, LLC  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Controlling ownership interest (as percent) 88.00%
Hanford Mission Integration Solutions  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Controlling ownership interest (as percent) 53.00%