Share-Based Compensation (Stock Option Activity) (Details)	9 Months Ended
	Oct. 31, 2015 USD ($) $ / shares shares
Stock Option Activity, Number of Underlying Shares
Outstanding, Number of Underlying Shares, Beginning Balance | shares	328,100
Granted, Number of Underlying Shares | shares	0
Exercised, Number of Underlying Shares | shares	0
Forfeited or expired, Number of Underlying Shares | shares	(34,300)
Outstanding, Number of Underlying Shares, Ending Balance | shares	293,800
Stock Option Activity, Weighted Average Exercise Price
Outstanding, Weighted-Average Exercise Price, Beginning Balance	$ 64.64
Granted, Weighted-Average Exercise Price	0.00
Exercised, Weighted-Average Exercise Price	0.00
Forfeited or expired, Weighted-Average Exercise Price	69.71
Outstanding, Weighted-Average Exercise Price, Ending Balance	$ 64.05
Outstanding, Aggregate Intrinsic Value | $	$ 0
Outstanding, Weighted-Average Remaining Contractual Life (in years)	1 year 11 months
Stock options exercisable, Number of Underlying Shares | shares	293,800
Stock options exercisable, Weighted-Average Exercise Price	$ 64.05
Stock options exercisable, Aggregate Intrinsic Value | $	$ 0
Stock options exercisable, Weighted-Average Remaining Contractual Life (in years)	1 year 11 months