Reconciliation of Income used in Calculating Earnings per Share (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended																12 Months Ended
	Jan. 31, 2014		Nov. 01, 2013		Aug. 02, 2013		May 03, 2013		Jan. 31, 2013		Oct. 31, 2012		Jul. 31, 2012		Apr. 30, 2012		Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Basic EPS:
Income (loss) from continuing operations, as reported	$ 47	[1],[2]	$ (8)	[1],[2]	$ 5	[1],[2]	$ 40	[1],[2]	$ 148	[1]	$ 58	[1]	$ 61	[1]	$ 57	[1]	$ 84	$ 324	$ (235)
Less: allocation of distributed and undistributed earnings to participating securities																	(3)	(7)	0
Income (loss) from continuing operations, for computing basic EPS																	81	317	(235)
Net income, as reported	44	[1],[2]	(3)	[1],[2]	42	[1],[2]	81	[1],[2]	186	[1]	112	[1]	110	[1]	117	[1]	164	525	59
Less: allocation of distributed and undistributed earnings to participating securities																	(3)	(11)	(2)
Net income, for computing basic EPS																	161	514	57
Diluted EPS:
Income (loss) from continuing operations, as reported	47	[1],[2]	(8)	[1],[2]	5	[1],[2]	40	[1],[2]	148	[1]	58	[1]	61	[1]	57	[1]	84	324	(235)
Less: allocation of distributed and undistributed earnings to participating securities																	(3)	(7)	0
Income (loss) from continuing operations, for computing diluted EPS																	81	317	(235)
Net income, as reported	44	[1],[2]	(3)	[1],[2]	42	[1],[2]	81	[1],[2]	186	[1]	112	[1]	110	[1]	117	[1]	164	525	59
Less: allocation of distributed and undistributed earnings to participating securities																	(3)	(11)	(2)
Net income, for computing diluted EPS																	$ 161	$ 514	$ 57

[1] Income from continuing operations and net income relate to Leidos Holdings, Inc. only, see Leidos, Inc.'s amounts detailed below

[2] Fiscal 2014 quarterly results include increased charges related to intangible asset impairment charges (second quarter charge was $30 million and another charge in the third quarter of $19 million), bad debt expense (third quarter expense was $42 million) and separation transaction and restructuring expenses (approximately $33 million in the first and second quarters combined, $25 million in the third quarter, and $7 million in the fourth quarter). For further information see, Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations.