Summary of Activity for Non-vested Shares (Restricted Shares) (Parenthetical) (Detail) (Employee Stock Plan, 2006 Plan, USD $)	12 Months Ended
	Jan. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares granted during the period, fair value	$ 58,643
Share-based compensation arrangement by share-based payment award, vesting period	3 years
Deferred Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares granted	11,238	[1]

[1] During fiscal 2014, the Company granted 11,238 shares of deferred stock, with a fair value of approximately $58,643, to a director as compensation in lieu of cash and in accordance with his irrevocable election. The shares of deferred stock, which have no continued service requirement, will vest three years from the date of grant. The Company recognized compensation expense in full on the date of grant.