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Description of the Business and Basis of Presentation (Details Textual)	6 Months Ended	12 Months Ended
	Jul. 31, 2012	Jan. 31, 2012 Entity
Description of Business and Basis of Presentation (Textual) [Abstract]
Minimum percentage of net revenue	90.00%
Number of variable interest entity		2

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- Definition

Minimum percentage of net revenue.

+ References

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- Definition

Number of Variable Interest Entities.

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