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Employee Stock and Savings Plans and Stockholders Equity Employee Stock and Savings Plans Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jan. 31, 2014
Restricted Stock
 
Share-based Compensation Arrangement by Share-based Payment Award  
Unrecognized compensation cost period of recognition 1 year 5 months 21 days
Unrecognized compensation cost $ 58,964
Stock Option
 
Share-based Compensation Arrangement by Share-based Payment Award  
Award expiry period from date of grant 10 years 0 months 0 days
Stock Options
 
Share-based Compensation Arrangement by Share-based Payment Award  
Unrecognized compensation cost period of recognition 1 year 0 months 25 days
Unrecognized compensation cost $ 3,580
Omnibus Incentive Plan
 
Share-based Compensation Arrangement by Share-based Payment Award  
Award requisite service period 4 years 0 months 0 days
Number of shares available for grant under incentive plan 3,993
Defined Contribution Pension
 
Share-based Compensation Arrangement by Share-based Payment Award  
Employer matching contribution percent 50.00%
Employer matching contribution, percent of employees' gross pay 6.00%
Plan vesting term 5 years 0 months 0 days
Employers matching contribution, annual vesting percentage 20.00%
Description of defined contribution pension and other postretirement plans We have an employee savings plan (the Savings Plan) that qualifies as a deferred salary arrangement under Section 401(k) of the Internal Revenue Code. Under the Savings Plan, participating U.S. employees may defer a portion of their pretax earnings, up to the Internal Revenue Service annual contribution limit. We currently match 50% of eligible employee's contributions, up to a maximum of 6% of the employee's earnings. Employer matching contributions vest over five years, 20% for each year of service completed.
Employee Stock Purchase Plans
 
Share-based Compensation Arrangement by Share-based Payment Award  
Maximum number of shares that may be purchased by eligible participants 6
Eligible employee stock purchase price 85.00%
Shares available for future purchase under ESPPs 2,547