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Summary of Significant Accounting Policies (Details) (Total revenue, Customer concentration risk)
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3 Months Ended | 6 Months Ended |
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Jul. 31, 2011
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Jul. 31, 2011
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| Concentration of credit risk | ||
| Number of customers that accounted for a specified percentage of the total revenue | 1 | 1 |
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One customer
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| Concentration of credit risk | ||
| Concentration risk (as a percent) | 16.00% | 14.00% |
| X | ||||||||||
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- Definition
Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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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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