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Segment Information, Significant Customers and Geographic Information - Schedule of Revenue by Major Customers by Reporting Segments (Detail) (Sales [Member])
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3 Months Ended | 6 Months Ended | ||
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Jul. 31, 2014
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Jul. 31, 2013
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Jul. 31, 2014
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Jul. 31, 2013
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Customer A [Member]
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| Revenue, Major Customer [Line Items] | ||||
| % of total revenue | 19.00% | 15.00% | 19.00% | 15.00% |
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Customer B [Member]
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| Revenue, Major Customer [Line Items] | ||||
| % of total revenue | 13.00% | 22.00% | 15.00% | 27.00% |
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Customer C [Member]
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| Revenue, Major Customer [Line Items] | ||||
| % of total revenue | 11.00% | 14.00% | 11.00% | 11.00% |