Balance Sheets [Abstract] Assets [Abstract] Assets Assets, Current [Abstract] Current assets: Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of period Cash and cash equivalents at beginning of period Cash and Cash Equivalents, at Carrying Value, Total Cash and cash equivalents Inventory, Finished Goods Inventory, Finished Goods, Total Merchandise inventories, net Prepaid Taxes Prepaid income taxes Assets, Current Total current assets Property, Plant and Equipment, Net Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net, Beginning Balance Property and equipment, net Assets Total assets Liabilities and Stockholders' Equity [Abstract] Liabilities and stockholders' equity Liabilities, Current [Abstract] Current liabilities: Accounts Payable, Current Accounts Payable, Current, Total Accounts payable Accrued Liabilities, Current Accrued Liabilities, Current, Total Accrued liabilities Accrued Income Taxes, Current Accrued income taxes Liabilities, Current Total current liabilities Deferred Rent Credit, Noncurrent Deferred rent Deferred Tax Liabilities, Noncurrent Deferred income taxes Liabilities Total liabilities Total liabilities Stockholders' Equity Attributable to Parent [Abstract] Stockholders' equity: Treasury Stock, Value Treasury stock-common, at cost Treasury Stock, Value, Ending Balance Treasury Stock, Value, Beginning Balance Treasury stock-common, at cost Retained Earnings (Accumulated Deficit) Retained Earnings (Accumulated Deficit), Ending Balance Retained Earnings (Accumulated Deficit), Beginning Balance Retained earnings Stockholders' Equity Attributable to Parent Ending Balance Beginning Balance Total stockholders' equity Liabilities and Stockholders' Equity Total liabilities and stockholders' equity Common Stock, Par or Stated Value Per Share Common Stock, Par Value Common Stock, Shares Authorized Common Stock, Shares Authorized Common Stock, Shares, Issued Common Stock, Shares, Issued, Total Common Stock, Shares Issued Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding, Beginning Balance Common Stock, Shares Outstanding Statements of Income [Abstract] Sales Revenue, Net Sales Revenue, Net, Total Net sales Gross Profit Gross profit Selling, General and Administrative Expense Selling, General and Administrative Expense, Total Selling, general and administrative expenses Pre-Opening Costs Pre-opening expenses Pre-opening expenses Operating Income (Loss) Operating income Operating income Interest Expense Interest expense Interest expense Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Cumulative Effects of Changes in Accounting Principles, Noncontrolling Interest Income before income taxes Income before income taxes Income Tax Expense (Benefit) Income tax expense Income tax expense Earnings Per Share, Basic Earnings Per Share, Basic, Total Basic Earnings Per Share, Diluted Earnings Per Share, Diluted, Total Diluted Weighted Average Number of Shares Outstanding, Basic Denominator for basic net income per share - weighted-average common shares Basic Weighted Average Number of Shares Outstanding, Diluted Denominator for diluted net income per share Denominator for diluted net income per share Diluted Statement of Cash Flows [Abstract] Net Cash Provided by (Used in) Operating Activities [Abstract] Operating activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Depreciation, Depletion and Amortization Depreciation, Depletion and Amortization, Total Depreciation and amortization Excess Tax Benefit from Share-based Compensation, Operating Activities Excess tax benefits from stock-based compensation Gain (Loss) on Sale of Property Plant Equipment Loss on disposal of property and equipment Gain (Loss) on Sale of Property Plant Equipment, Total Increase (Decrease) in Operating Capital [Abstract] Change in operating assets and liabilities: Increase (Decrease) in Finished Goods and Work in Process Inventories Merchandise inventories Increase (Decrease) in Accounts Payable Increase (Decrease) in Accounts Payable, Total Accounts payable Increase (Decrease) in Accrued Liabilities Increase (Decrease) in Accrued Liabilities, Total Accrued liabilities Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Net cash provided by operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] Investing activities Payments to Acquire Property, Plant, and Equipment Purchases of property and equipment Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment, Total Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities Net cash used in investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Financing activities Excess Tax Benefit from Share-based Compensation, Financing Activities Excess tax benefits from stock-based compensation Excess tax benefits from stock-based compensation Net Cash Provided by (Used in) Financing Activities Supplemental Cash Flow Information [Abstract] Supplemental cash flow information Common Stock [Member] Common Stock Statement of Stockholders' Equity [Abstract] Statement [Table] Statement, Equity Components [Axis] Equity Component [Domain] Parent [Member] Parent Treasury Stock [Member] Treasury - Common Stock Additional Paid-in Capital [Member] Additional Paid-in Capital Retained Earnings [Member] Retained Earnings Statement [Line Items] Shares, Issued Ending Balance, Shares Beginning Balance, Shares Stock Issued During Period, Value, Stock Options Exercised Common stock options exercised Stock Issued During Period, Shares, Stock Options Exercised Common stock options exercised, Shares Adjustments to Additional Paid in Capital, Tax Effect from Share-based Compensation Excess tax benefits from stock-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Value Stock compensation charge Business and basis of presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Summary of significant accounting policies Significant Accounting Policies [Text Block] Commitments and Contingencies Disclosure [Text Block] Fair Value Disclosures [Text Block] Fair Value Measurements Net Income Per Common Share [Abstract] Net income per common share Earnings Per Share [Text Block] Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Volatility rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Average risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Average expected life (in years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Dividend yield Summary of Significant Accounting Policies (Textuals) [Abstract] Summary of Significant Accounting Policies (Textuals) [Abstract] Summary Of Significant Accounting Policies. Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period Number of shares granted in stock option Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Weighted average fair value of stock option Document and Entity Information [Abstract] Document and Entity Information Abstract. Deferred Tax Assets, Net, Current Deferred Tax Assets, Net, Current, Ending Balance Deferred Tax Assets, Net, Current, Beginning Balance Deferred income taxes Additional Paid in Capital, Common Stock Additional Paid in Capital, Common Stock, Ending Balance Additional Paid in Capital, Common Stock, Beginning Balance Additional paid-in capital Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted average common shares outstanding: Share-based Compensation Stock compensation expenses Share-based Compensation, Total Non-cash stock compensation charges Increase Decrease In Deferred Rent Deferred rent Deferred rent Increase Decrease In Deferred Rent. Increase (Decrease) in Accrued Income Taxes Payable Income taxes Proceeds from Stock Options Exercised Proceeds from issuance of common stock under stock plans Income Taxes Paid, Net Cash paid for income taxes Cash paid for income taxes Other Noncash Investing and Financing Items [Abstract] Noncash investing and financing activities: Capital Expenditures Incurred but Not yet Paid Change in property and equipment included in accrued liabilities Change in property and equipment included in accrued liabilities Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Document Fiscal Year Focus Document Fiscal Period Focus Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Public Float Entity Common Stock, Shares Outstanding Commitments And Contingencies (Textuals) [Abstract] Commitments and contingencies (Textuals) [Abstract] Commitments and contingencies. Non Cancelable Operating Lease Terms Minimum Non-cancelable operating lease terms, minimum Non cancelable operating lease terms minimum. Non Cancelable Operating Lease Terms Maximum Non cancelable operating lease terms maximum. Non-cancelable operating lease terms, maximum Operating Leases, Rent Expense Total rent expense under operating leases Notes Payable (Textuals) [Abstract] Notes Payable (Textuals) [Abstract] Notes Payable. Line of Credit Facility, Maximum Borrowing Capacity Letters of credit subfacility, maximum borrowing capacity Line of credit facility, maximum borrowing capacity Line of Credit Facility, Interest Rate Description Interest rate on outstanding borrowing under facility Incremental Common Shares Attributable to Share-based Payment Arrangements Dilutive effect of stock options and non-vested stock Net income per common share (Textuals) [Abstract] Net income per common share (Textuals) [Abstract] Net income per common share. Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive stock option excluded from computation of net income per common share Notes Payable Additional (Textuals) [Abstract] Notes Payable (Additional) (Textuals) [Abstract] Notes Payable Additional Textuals Abstract. Percentage Of Unused Line Of Credit Facility Fee Percentage of unused Line of Credit Facility Fee Percentage of Unused Line of Credit Facility Fee. Net Income Per Basic And Diluted Share [Abstract] Net income per common share reconciliation Net income per common share reconciliation. Line of Credit Facility [Table] Line of Credit Facility [Axis] Line of Credit Facility, Lender [Domain] Line of Credit Facility [Line Items] Receivables, Net, Current Receivables, Net, Current, Total Receivables, net Increase (Decrease) in Accounts and Other Receivables Receivables Debt Instrument, Maturity Date Line of credit expiration date Standby Letters of Credit [Member] Fair Value Measurements (Textuals) [Abstract] Fair Value Measurements (Textuals) [Abstract] Fair Value Measurements. Financial Liabilities Related To Non Qualified Deferred Compensation Plan Financial liabilities related to non-qualified deferred compensation plan. Financial liabilities related to non-qualified deferred compensation plan Fair Value, Inputs, Level 2 [Member] Deferred Income Tax Expense (Benefit) Deferred Income Tax Expense (Benefit), Total Deferred income taxes Commitments and Contingencies Commitments and contingencies (note 3) Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized Summary of significant accounting policies Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Net income per common share: Net Income (Loss) Attributable to Parent Net income for the six months ended July 30, 2011 Net income Net income Tangible Net Worth Tangible Net Worth Tangible net worth Line of Credit Facility, Covenant Terms Credit facility restrictive financial covenant Maximum Borrowing Under Facility Maximum borrowing under facility Maximum borrowing under facility. Commitments and contingencies Notes payable Debt Disclosure [Text Block] Fair Value Measurements [Abstract] Unrecognized compensation expense related to unvested options and restricted stock Prepaid Expense and Other Assets, Current Prepaid Expense and Other Assets, Current, Total Prepaid expenses and other current assets Net income per basic and diluted share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Cash and Cash Equivalents, Period Increase (Decrease) Net increase in cash and cash equivalents Net increase in cash and cash equivalents Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Fair value of stock option using a Black-Scholes valuation model Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Fair value of stock option using a Black-Scholes valuation model Earnings Per Share, Basic and Diluted [Abstract] Net income per common share: Increase (Decrease) in Prepaid Expense Prepaid expenses and other assets Common Stock, Value, Issued Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Total Common stock, $.01 par value, 400,000 shares authorized; 61,693, 60,707 and 59,365 shares issued; 61,188, 60,202 and 58,860 shares outstanding; at July 30, 2011 (unaudited), January 29, 2011 and July 31, 2010 (unaudited), respectively Business And Basis Of Presentation [Table] Business and basis of presentation [Table] Business and basis of presentation. Business And Basis Of Presentation [Axis] Business and basis of presentation [Axis] Business and basis of presentation. Business And Basis Of presentation [Line Items] Business and basis of presentation [Line Items] Business and basis of presentation. Number of Stores Number of stores operated by company Number of States in which Entity Operates Details of Company Operated Stores In Following States [Table Text Block] Details of Company operated stores in following states. Details of Company operated stores in following states Net cash provided by financing activities ALABAMA Alabama [Member] ARIZONA Arizona [Member] ARKANSAS Arkansas [Member] CALIFORNIA California [Member] COLORADO Colorado [Member] CONNECTICUT Connecticut [Member] DELAWARE Delaware [Member] FLORIDA Florida [Member] GEORGIA Georgia [Member] IDAHO Idaho [Member] ILLINOIS Illinois [Member] INDIANA Indiana [Member] IOWA Iowa [Member] KANSAS Kansas [Member] KENTUCKY Kentucky [Member] LOUISIANA Louisiana [Member] MAINE Maine [ Member] MARYLAND Maryland [Member] MASSACHUSETTS Massachusetts [Member] MICHIGAN Michigan [Member] MINNESOTA Minnesota [Member] MISSISSIPPI Mississippi [Member] MISSOURI Missouri [Member] NEBRASKA Nebraska [Member] NEVADA Nevada [Member] NEW HAMPSHIRE New Hampshire [Member] NEW JERSEY New Jersey [Member] NEW YORK New York [Member] NEW MEXICO New Mexico [Member] NORTH CAROLINA North Carolina [Member]