Stock Based Compensation (Schedule Of Stock Options Activity) (Details)	6 Months Ended
	Jul. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares, Outstanding at January 31, 2013	502,225
Shares, Exercised	(169,246)
Shares, Canceled	(1,514)
Shares, Outstanding at July 31, 2013	331,465