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 | 9 Months Ended | ||
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Oct. 31, 2014
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Oct. 31, 2013
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Oct. 31, 2014
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Oct. 31, 2013
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Customer A [Member]
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Revenue, Major Customer [Line Items] | ||||
% of total revenues | 18.00% | 15.00% | 19.00% | 15.00% |
Customer B [Member]
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Revenue, Major Customer [Line Items] | ||||
% of total revenues | 15.00% | 20.00% | 15.00% | 25.00% |
Customer C [Member]
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Revenue, Major Customer [Line Items] | ||||
% of total revenues | 10.00% |