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Stock Based Compensation (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 3,091 $ 2,941 [1]
Number of shares authorized for grant 4,000,000  
Number of shares available for grant 3,000,000  
Contractual term (in years) 10 years  
Minimum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards vesting period, (in years) 1 year  
Maximum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards vesting period, (in years) 4 years  
[1] (1) See Note 2 - Restatement of Consolidated Financial Statements.