Stock Based Compensation (Schedule Of Restricted Stock Units Activity) (Details)	6 Months Ended
	Jul. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Shares, Outstanding at January 31, 2013	284,204
Shares, Granted	446,364
Shares, Vested	(150,974)
Shares, Canceled	(9,438)
Shares, Outstanding at July 31, 2013	570,156