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401(k) Plan - Additional Information (Details) | 12 Months Ended
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Jan. 31, 2016
Compensation And Retirement Disclosure [Abstract] |
Maximum allowed percentage of employee's pre-tax salary contributed to the 401(k) plan | 100.00%

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- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration