Employee Benefit Plans (Schedule Of Stock Options Activity) (Details)	12 Months Ended
	Jan. 31, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at January 31, 2015 | shares	42,110
Shares, Exercised | shares	(9,700)
Outstanding at January 31, 2016 | shares	32,410
Vested and expected to vest at January 31, 2015, Shares | shares	32,410
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted-average exercise price, Outstanding at January 31, 2015 | $ / shares	33.97
Weighted-average exercise price, Exercised | $ / shares	37.04
Weighted-average exercise price, Outstanding at January 31, 2016 | $ / shares	33.06
Weighted-average exercise price, vested and expected to vest at January 31, 2015 | $ / shares	33.06
Share Based Compensation Arrangement By Share Based Payment Award Options And Stock Settled SAR Vested And Expected To Vest Weighted Average Remaining Contractual Term	2 years 8 months
Weighted-Average remaining contractual term (in years), Outstanding at January 31, 2015	2 years 8 months
Weighted-Average remaining contractual term (in years), Exercisable at January 31, 2015	2 years 8 months
Aggregate intrinsic value, Outstanding | $	$ 951,000
Aggregate intrinsic value, Vested and expected to vest at January 31, 2015 | $	951,000
Aggregate intrinsic value, Exercisable at January 31, 2015 | $	$ 951,000