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401(k) Plan - Additional Information (Details)	12 Months Ended
	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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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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

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration