Schedule Of Deferred Tax Assets (Liabilities) (Detail) (USD $) In Millions, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013
Income Tax Disclosure [Abstract]
Accrued vacation and bonuses	$ 62	$ 55
Investments	3	5
Deferred compensation	38	40
Vesting stock awards	34	38
Credits and net operating losses carryovers	27	34
Employee benefit contributions	3	1
Reserves	51	37
Other	23	29
Total deferred tax assets	241	239
Valuation allowance	(7)	(7)
Deferred Tax Assets, Net of Valuation Allowance	234	232
Deferred revenue	(31)	(71)
Fixed asset basis differences	(27)	(12)
Purchased intangible assets	(138)	(135)
Total deferred tax liabilities	(196)	(218)
Net deferred tax assets	$ 38	$ 14