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Stock-Based Compensation Stock Compensation Expense (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Share-based Compensation $ 10,278us-gaap_ShareBasedCompensation $ 8,129us-gaap_ShareBasedCompensation
Cost of Sales [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Share-based Compensation 708us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 535us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
Research and Development Expense [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Share-based Compensation 4,318us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember		 3,241us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
Selling and Marketing Expense [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Share-based Compensation 2,480us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingAndMarketingExpenseMember		 2,178us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingAndMarketingExpenseMember
General and Administrative Expense [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Share-based Compensation $ 2,772us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember		 $ 2,175us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember