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Summary of Significant Accounting Policies - Additional Information (Details) - Segment	9 Months Ended	12 Months Ended
	Oct. 31, 2015	Jan. 31, 2015
Accounting Policies [Abstract]
Fiscal period duration	364 days	364 days
Number of reportable segment	1

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- Definition

Duration of a fiscal period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but not limited to, weeks in a year or quarter.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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