Share-Based Compensation (Outstanding Stock Units) (Details) - Director [Member]	12 Months Ended
	Jan. 31, 2016 $ / shares shares
Number of stock units
Outstanding, beginning of period (in shares) | shares	69,347
Granted (in shares) | shares	18,721
Deferred retainers (in shares) | shares	3,120
Dividends (in shares) | shares	2,546
Outstanding, end of period (in shares) | shares	93,734
Weighted average price
Outstanding, beginning of period (in usd per share) | $ / shares	$ 21.44
Vested (in usd per share) | $ / shares	19.23
Deferred retainers (in usd per share) | $ / shares	19.23
Dividends (in usd per share) | $ / shares	17.67
Outstanding, end of period (in usd per share) | $ / shares	$ 20.82