Segment Information, Significant Customers and Geographic Information - Additional Information (Detail) - Segment |
12 Months Ended | ||
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Jan. 31, 2018 |
Jan. 31, 2017 |
Jan. 31, 2016 |
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| Segment Reporting Information [Line Items] | |||
| Number of reportable segment | 1 | ||
| Total Revenue [Member] | Customer Concentration Risk [Member] | |||
| Segment Reporting Information [Line Items] | |||
| Concentration risk percentage | 10.00% | 10.00% | 10.00% |
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition 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. No definition available.
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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