Geographic Information And Concentration Of Risk (Narrative) (Details) (Minimum [Member])	6 Months Ended
Jul. 31, 2011
Minimum [Member]
Percentage of sales activity of major class customer	10

- 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).

+ References+ Details