Equity Award Plans - Summary of Cumulative Minimum, Target and Maximum Restricted Stock Units Award Activity (Details) - Executive Officer - Restricted Stock Units (RSUs)	Apr. 30, 2016 shares
2016 Awards | Performance Period January 31, 2016 to February 3, 2018
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Minimum cumulative restricted stock units available for future declaration	9,806
Target cumulative restricted stock units available for future declaration	39,220
Maximum cumulative restricted stock units available for future declaration	58,831
2015 Awards | Performance Period February 2, 2015 to January 28, 2017
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Minimum cumulative restricted stock units available for future declaration	15,218
Target cumulative restricted stock units available for future declaration	30,436
Maximum cumulative restricted stock units available for future declaration	45,655