Segment Information, Significant Customers and Geographic Information (Details)
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12 Months Ended | ||
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Jan. 31, 2013
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Jan. 31, 2012
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Jan. 31, 2011
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Customer A [Member]
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Entity-Wide Revenue, Major Customer, Percentage | 18.00% | 24.00% | 27.00% |
Customer B [Member]
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Entity-Wide Revenue, Major Customer, Percentage | 12.00% | 11.00% | 11.00% |
Customer C [Member]
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Entity-Wide Revenue, Major Customer, Percentage | 11.00% |
X | ||||||||||
- Definition
Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. No definition available.
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