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Employee Stock and Savings Plans Employee Stock and Savings Plans Additional Information (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Jan. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares available for grant under incentive plan 5,392
Shares available for future purchase under ESPPs 4,101
Employer matching contribution percent 50.00%
Maximum annual contribution per employee percent 6.00%
Defined Contribution Plan Vesting Term 5 years 0 months 0 days
Defined Contribution Plan, 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.
Restricted Stock [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation cost period of recognition 1 year 7 months 6 days
Unrecognized compensation cost 44,668
Employee Options Exchange [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price lower limit 11.00
Options exchanged 6,945
Restricted stock units received in exchange 557
Incremental compensation cost 491
Unrecognized compensation cost period of recognition 2 years 0 months 0 days
Stock Option [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Award Requisite Service Period 4 years 0 months 0 days
Award Expiry Period From Date Of Grant 10 years 0 months 0 days
Stock Options [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation cost period of recognition 1 year 4 months 24 days
Unrecognized compensation cost 6,061
Acquired Company Options Exchange [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Award Requisite Service Period 4 years 0 months 0 days
Award Expiry Period From Date Of Grant 10 years 0 months 0 days
Shares authorized and issued 2,160
Employee Stock Purchase Plans
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Employee Stock Purchase Plan Maximum Number Of Shares That May Be Purchased By Eligible Participants 6
Eligible employee stock purchase price 85.00%