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Summary of Business and Significant Accounting Policies (Policy)
3 Months Ended
Apr. 30, 2011
Summary of Business and Significant Accounting Policies  
Basis of Presentation
Use of Estimates
Principles of Consolidation
Segments
Foreign Currency Translation
Concentrations of Credit Risk and Significant Customers
Cash and Cash Equivalents
Marketable Securities
Fair Value Measurement
Strategic Investments
Derivative Financial Instruments
Investment Income
Comprehensive Income (loss)
Net Income Per Share
Income Taxes
Effective Tax Rate
Unrecognized Tax Benefits and Other Considerations
Revenue Recognition
Deferred Revenue
Deferred Commissions
Business Combinations
Accounting for Stock-Based Compensation
Goodwill, Intangible Assets and Impairment Assessments
Warranties and Indemnification
Subsequent Events