Income Taxes Schedule of Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Components of Deferred Tax Assets [Abstract]
Deferred revenue	$ 111,979	$ 116,812
Loss carryforwards	210,292	176,679
Stock-based and other compensation	25,749	43,610
Tax credits	59,626	63,440
Other	26,114	40,655
Total deferred tax assets	433,760	441,196
Valuation allowance	(340,579)	(319,679)	(319,789)
Net deferred income tax (liability) assets	(51,937)	(6,204)
Components of Deferred Tax Liabilities [Abstract]
Deferred cost of revenue	(68,715)	(61,302)
Investment in affiliates	(23,717)	(14,937)
Goodwill and other intangible assets	(51,782)	(50,865)
Other	(904)	(617)
Total deferred tax liabilities	(145,118)	(127,721)
Deferred Tax Assets (Liabilities), Net [Abstract]
Current deferred income tax assets	23,555	39,644
Noncurrent deferred income tax assets	19,321	20,766
Current deferred income tax liabilities	(9,798)	(13,661)
Noncurrent deferred income tax liabilities	(85,015)	(52,953)
Net deferred income tax (liability) assets	$ (51,937)	$ (6,204)