Financial Instruments (Details) (USD $)	3 Months Ended		6 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012
Disclosure Text Block Supplement [Abstract]
Gain (Loss) on Derivative Instruments, Net, Pretax	$ (10,000)	$ (79,000)	$ (6,000)	$ (226,000)