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Stock options Options by grant price (Tables)	12 Months Ended
Stock options Options by grant price (Tables)	Jan. 31, 2013
Options by grant price [Abstract]
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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