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Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Jan. 31, 2020
Jan. 31, 2019
Income Tax Disclosure [Abstract]    
Prepaid expense $ (2,393) $ (1,729)
Depreciation (32,311) (39,303)
Operating lease right-of-use assets (260,706)  
Other temporary differences (1,129) (1,258)
Gross deferred tax liabilities (296,539) (42,290)
Operating lease liabilities 310,209  
Deferred rent   52,409
Inventory 11,436 10,579
Accounts receivable 1,475 2,198
Net operating loss carryforwards 4,547 1,945
Tax uncertainties 1,336 953
Accrued salaries and benefits 17,534 20,216
Income tax credits 4,511 4,659
Other temporary differences 10,050 6,119
Gross deferred tax assets, before valuation allowances 361,098 99,078
Valuation allowances (13,459) (3,906)
Net deferred tax assets $ 51,100 $ 52,882