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Summary of Significant Components of Net Deferred Tax Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2014
Jan. 31, 2013
Deferred tax assets    
Compensation $ 3,125 $ 1,800
Provision for bad debts and sales allowances 11,822 8,661
Inventory write-downs 3,745 1,801
Other 254 600
Deferred tax assets, current 18,946 12,862
Compensation 5,876 4,480
Straight-line lease 4,494 3,310
Supplemental employee retirement plan 477 494
Net operating loss 1,779 354
Other 81 1,491
Deferred tax assets, non-current 12,707 10,129
Total deferred tax assets 31,653 22,991
Deferred tax liabilities    
Prepaid expenses and other, current (2,615) (2,577)
Depreciation and amortization, non-current (7,955) (3,127)
Intangibles, non-current (26,061) (21,382)
Other (791) (62)
Total deferred tax liabilities (37,422) (27,148)
Net deferred tax assets $ (5,769) $ (4,157)