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Stock-Based Compensation - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 1 Months Ended 8 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Jun. 14, 2013
Nov. 01, 2013
Sep. 27, 2013
Oct. 31, 2014
Nov. 01, 2013
Mar. 31, 2013
Oct. 31, 2014
Stock Options
Nov. 01, 2013
Stock Options
Oct. 31, 2014
Performance-Based Stock Awards
Nov. 01, 2013
Performance-Based Stock Awards
Oct. 31, 2014
Vesting Stock Awards
Oct. 31, 2014
Outside Directors
Nov. 01, 2013
Outside Directors
Jan. 31, 2014
2006 Equity Incentive Plan
Oct. 31, 2014
2015 Equity Incentive Plan
Oct. 31, 2014
Group One
2006 Equity Incentive Plan
Oct. 31, 2014
Group Two
2006 Equity Incentive Plan
Sep. 19, 2013
SAIC
Sep. 19, 2013
SAIC
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                      
Stock issued to Leidos shareholder upon divestiture of SAIC, ratio                                   1.4285 1.4523
Percentage of stock awards vest or exercisable after one year                           20.00% 25.00%        
Percentage of stock awards vest or exercisable after two years                             25.00%        
Percentage of stock awards vest or exercisable after three years                             25.00%        
Percentage of stock awards vest or exercisable after four years                           40.00% 25.00%        
Vesting period       3 years     4 years 4 years 3 years   4 years 1 year 1 year     4 years 7 years    
Expected term   5 years 5 years 4 years 8 months 12 days     7 years 7 years                      
Special cash dividends per share           $ 4                          
Payments of special dividend, aggregate $ 342     $ 72 $ 452                            
Unvested stock option not recognized             $ 7   $ 1   $ 55                
Unvested stock option not recognized, period for recognition             1 year 7 months 6 days   2 years   1 year 8 months 12 days                
Maximum percentage that will ultimately be awarded       150.00%                              
Grants during the period (shares)                 50,000 0 700,000                
Weighted average grant date fair value (usd per share)                 $ 36.88   $ 36.92                
Performance period                 3 years