Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended		0 Months Ended
	Jan. 31, 2015 Subsidiaries vendor Store state	Feb. 01, 2014	Jan. 31, 2015	Dec. 23, 2014	Dec. 22, 2014	Jul. 19, 2013	Jul. 18, 2013	Aug. 21, 2012	Jun. 05, 2014	Jun. 04, 2014
Summary Of Significant Accounting Policies [Line Items]
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic	$ 200,000
Goodwill, Gross	1,200,000		1,200,000
Number of book stores company operated	256		256
Number of states	32		32
Number of wholly owned subsidiaries	10
Breakage income	1,500,000	1,600,000
Number of vendors (over)	3,000
Replacement and current cost of inventory over stated LIFO value	4,600,000		4,600,000
FIFO measurement of inventory which is recorded at LIFO	192,605,000	204,220,000	192,605,000
Accruals for inventory shortages	5,600,000	5,400,000	5,600,000
Property, Plant and Equipment, Net	84,757,000	77,396,000	84,757,000
Property and equipment as percentage of aggregate assets	28.80%		28.80%
Impairment charges	400,000	700,000
Deferred rent	7,700,000	9,200,000	7,700,000
Store closing cost	600,000	500,000
Advertising costs, net of applicable vendor reimbursements	2,500,000	1,100,000
Advertising costs charged to operating, selling and administrative expenses	3,200,000	4,300,000
Net receivables	3,500,000	3,700,000	3,500,000
Cash equivalents related to debit card, credit card and electronic check transaction	3,000,000	2,700,000	3,000,000
Maturity period of investment	90 days
Stock repurchase plan, Authorized amount								5,000,000.0
Number of shares repurchased	0	384,000
Shares repurchased amount		1,000,000
Pre-tax compensation cost for stock-based employee compensation	900,000	800,000
Pre-tax compensation cost for stock based compensation, net of taxes	$ 500,000	$ 500,000
Yogurt Mountain Holding LLC [Member]
Summary Of Significant Accounting Policies [Line Items]
Additional ownership interest acquired to consolidate entity as VIE				0.001%
Ownership percentage in consolidated VIE			50.001%	50.001%	50.00%	50.00%	40.00%
IF [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of equity method investment owned by company	25.00%		25.00%
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Discount on Millionaire's Club Card	10.00%
Minimum [Member] | Furniture and fixtures
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life long-lived assets	2 years
Minimum [Member] | Buildings and Leasehold Improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life long-lived assets	2 years
Maximum [Member] | Furniture and fixtures
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life long-lived assets	10 years
Maximum [Member] | Buildings and Leasehold Improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life long-lived assets	40 years
June 2014 Repurchase Program [Member] | Common Stock [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased									655,596	309,200
Stock Repurchase Program, Price Per Share										$ 2.15
Stock Repurchased Program, Discount on Closing Price Per Share										$ 0.03
Top Five Vendors [Member] | Cost of Goods, Total [Member] | Supplier Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of concentration	49.10%	46.60%
One Vendor [Member] | Cost of Goods, Total [Member] | Supplier Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of concentration	16.10%	13.30%