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Separation Transaction Expenses (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. 30, 2015	Jan. 31, 2014	Jan. 31, 2013
Accounting Policies [Abstract]
Strategic advisory services					$ 0ldos_StrategicAdvisoryServicesExpense	$ 7ldos_StrategicAdvisoryServicesExpense	$ 1ldos_StrategicAdvisoryServicesExpense
Legal and accounting services					0ldos_LegalAndAccountingServicesExpense	2ldos_LegalAndAccountingServicesExpense	0ldos_LegalAndAccountingServicesExpense
Lease termination and facility consolidation expenses					3	46	2
Severance costs					0us-gaap_SeveranceCosts1	10us-gaap_SeveranceCosts1	8us-gaap_SeveranceCosts1
Separation transaction expenses in operating income					3	65	11
Less: income tax benefit					(1)	(25)	(4)
Separation transaction expenses, net of tax	$ 7	$ 25	$ 19	$ 14	$ 2	$ 40	$ 7

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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