Share-Based Compensation (Stock Option Activity) (Details)	3 Months Ended
	Apr. 30, 2016 USD ($) $ / shares shares
Stock Option Activity, Number of Underlying Shares
Number of Underlying Shares, Beginning Balance at January 30, 2016 | shares	271,000
Number of Underlying Shares, Granted | shares	0
Number of Underlying Shares, Exercised | shares	(2,000)
Number of Underlying Shares, Forfeited or expired | shares	(17,700)
Number of Underlying Shares, Ending Balance at April 30, 2016 | shares	251,300
Number of Underlying Shares, Stock options exercisable | shares	251,300
Stock Option Activity, Weighted Average Exercise Price
Weighted-Average Exercise Price, Beginning Balance at January 30, 2016 | $ / shares	$ 63.05
Weighted-Average Exercise Price, Granted | $ / shares	0.00
Weighted-Average Exercise Price, Exercised | $ / shares	22.87
Weighted-Average Exercise Price, Forfeited or expired | $ / shares	67.13
Weighted-Average Exercise Price, Ending Balance at April 30, 2016 | $ / shares	63.08
Weighted-Average Exercise Price, Stock options exercisable | $ / shares	$ 63.08
Aggregate Intrinsic Value, Outstanding | $	$ 377,400
Aggregate Intrinsic Value, Stock options exercisable | $	$ 377,400
Weighted-Average Remaining Contractual Life (in years), Outstanding	1 year 8 months
Weighted-Average Remaining Contractual Life (in years), Stock options exercisable	1 year 8 months