Reconciliation of Income used in Calculating Earnings per Share (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended																12 Months Ended
	Jan. 30, 2015		Oct. 31, 2014		Aug. 01, 2014		May 02, 2014		Jan. 31, 2014		Nov. 01, 2013		Aug. 02, 2013		May 03, 2013		Jan. 30, 2015	Jan. 31, 2014	Jan. 31, 2013
Basic EPS:
Income (loss) from continuing operations, as reported	$ 26	[1],[2]	$ 38	[1],[2]	$ (439)	[1],[2]	$ 45	[1],[2]	$ 47	[1]	$ (8)	[1]	$ 4	[1]	$ 41	[1]	$ (330)	$ 84	$ 323
Less: allocation of distributed and undistributed earnings to participating securities																	0	3	7
Income (loss) from continuing operations, for computing basic EPS																	(330)	81	316
Net income, as reported	44	[1],[2]	34	[1],[2]	(438)	[1],[2]	37	[1],[2]	44	[1]	(3)	[1]	42	[1]	81	[1]	(323)	164	525
Less: allocation of distributed and undistributed earnings to participating securities																	0	(3)	(11)
Net income, for computing basic EPS																	(323)	161	514
Diluted EPS:
Income (loss) from continuing operations, as reported	26	[1],[2]	38	[1],[2]	(439)	[1],[2]	45	[1],[2]	47	[1]	(8)	[1]	4	[1]	41	[1]	(330)	84	323
Less: allocation of distributed and undistributed earnings to participating securities																	0	(3)	(7)
Income (loss) from continuing operations, for computing diluted EPS																	(330)	81	316
Net income, as reported	44	[1],[2]	34	[1],[2]	(438)	[1],[2]	37	[1],[2]	44	[1]	(3)	[1]	42	[1]	81	[1]	(323)	164	525
Less: allocation of distributed and undistributed earnings to participating securities																	0	(3)	(11)
Net income, for computing diluted EPS																	$ (323)	$ 161	$ 514

[1] Income (loss) 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 the following charges: 1) intangible asset impairment charges of $30 million and $19 million in the second and third quarter, respectively; 2) bad debt expense for certain receivables related to two energy design-build construction projects of $42 million in the third quarter; and 3) separation transaction and restructuring expenses in each of the quarters of approximately $14 million, $19 million, $25 million, and $7 million, respectively. For further information see,