Derivative Financial Instruments (Details Textual)	3 Months Ended
	Apr. 30, 2013 USD ($)	Apr. 30, 2012 USD ($)	Apr. 30, 2013 CHF
Derivative Financial Instruments (Textual) [Abstract]
Net forward contracts hedging portfolio			31,000,000
Expiry dates ranging	Oct. 17, 2013
Derivative financial instruments net losses	0	1,000,000
Tax portion of derivative financial instruments net losses		1,000,000
Length of time of the company hedges	24 months
Charge related to its assessment derivative hedge portfolio	$ 0	$ 0