Share Based Compensation (Stock Option Activity) (Details) (USD $)	12 Months Ended
	Jan. 31, 2015
Number of Underlying Shares Outstanding [Roll Forward]
Number of Underlying Shares, Outstanding, Beginning Balance (in shares)	532,400
Number of Underlying Shares, Exercised (in shares)	(7,500)
Number of Underlying Shares, Forfeited or expired (in shares)	(196,800)
Number of Underlying Shares, Outstanding, Ending Balance (in shares)	328,100
Weighted Average Exercise Price [Roll Forward]
Weighted-Average Exercise Price, Outstanding, Beginning Balance (in dollars per share)	$ 65.37
Weighted-Average Exercise Price, Exercised (in dollars per share)	$ 33.74
Weighted-Average Exercise Price, Forfeited or expired (in dollars per share)	$ 67.79
Weighted-Average Exercise Price, Outstanding, Ending Balance (in dollars per share)	$ 64.64
Number of Shares Outstanding, Aggregate Intrinsic Value	$ 310,100
Weighted- Average Remaining Contractual Life, Outstanding	2 years 7 months
Number of Underlying Shares, Stock options exercisable (in shares)	328,100
Weighted-Average Exercise Price, Stock options exercisable (in dollars per share)	$ 64.64
Aggregate Intrinsic Value, Stock options exercisable	$ 310,100
Weighted-Average Remaining Contractual Life, Stock options exercisable	2 years 7 months