Earnings per Share - Basic and Diluted Weighted Average Common Shares Used in Earnings Per Share Calculation (Detail) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	12,051	12,476	12,035	12,631
Stock options		194	17	267
Unvested restricted stock	54	21	42	27
Total weighted average common share equivalents	54	215	59	294
Diluted weighted average common shares outstanding	12,105	12,691	12,094	12,925