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Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Jan. 31, 2016
Jan. 31, 2015
Components Of Deferred Tax Assets And Liabilities [Line Items]    
Prepaid expense $ (4,645) $ (3,732)
Depreciation (66,936) (51,774)
Other temporary differences (2,604) (1,728)
Gross deferred tax liabilities (74,185) (57,234)
Deferred rent 72,253 70,023
Inventory 11,031 8,137
Accounts receivable 3,953 2,844
Net operating loss carryforwards 4,941 4,003
Tax uncertainties 2,972 3,363
Accrued salaries and benefits 27,660 31,747
Income tax credits 4,287 114
Other temporary differences 7,896 5,725
Gross deferred tax assets, before valuation allowances 134,993 125,956
Valuation allowances (6,560) (45)
Net deferred tax assets $ 54,248 $ 68,677