Summary of Significant Components of Net Deferred Tax Assets (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2013	Jan. 31, 2012
Deferred tax assets
Compensation	$ 1,800	$ 1,995
Provision for bad debts and sales allowances	8,661	7,474
Inventory write-downs	1,801	1,964
Other	600
Deferred tax assets, current	12,862	11,433
Compensation	4,480	2,859
Straight-line lease	3,310	2,596
Supplemental employee retirement plan	494	405
Net operating loss	354	242
Other	1,491	193
Deferred tax assets, non-current	10,129	6,295
Total deferred tax assets	22,991	17,728
Deferred tax liabilities
Prepaid expenses and other, current	(2,577)	(1,874)
Depreciation and amortization, non-current	(3,127)	(1,140)
Intangibles, non-current	(21,382)	(6,444)
Other	(62)
Total deferred tax liabilities	(27,148)	(9,458)
Net deferred tax assets (liabilities)	$ (4,157)	$ 8,270