Basis of Presentation and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Apr. 29, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Fiscal Period, Policy [Policy Text Block]	Fiscal Periods Our fiscal year ends on the Saturday nearest to January 31, which results in fiscal years consisting of 52 or 53 weeks. Unless otherwise stated, references to years in this report relate to fiscal years rather than calendar years. Fiscal year 2017 (“2017”) is comprised of the 53 weeks that began on January 29, 2017 and will end on February 3, 2018. Fiscal year 2016 (“2016”) was comprised of the 52 weeks that began on January 31, 2016 and ended on January 28, 2017. The fiscal quarters ended April 29, 2017 (“first quarter of 2017”) and April 30, 2016 (“first quarter of 2016”) were both comprised of 13 weeks.
Selling, General and Administrative Expenses, Policy [Policy Text Block]	Selling and Administrative Expenses Selling and administrative expenses include store expenses (such as payroll and occupancy costs) and costs related to warehousing, distribution, outbound transportation to our stores, advertising, purchasing, insurance, non-income taxes, accepting credit/debit cards, and overhead. Our selling and administrative expense rates may not be comparable to those of other retailers that include warehousing, distribution, and outbound transportation costs in cost of sales. Warehousing, distribution, and outbound transportation costs included in selling and administrative expenses were $39.3 million and $37.7 million for the first quarter of 2017 and the first quarter of 2016, respectively.
Advertising Costs, Policy [Policy Text Block]	Advertising Expense Advertising costs, which are expensed as incurred, consist primarily of television and print advertising, digital or internet marketing and advertising, and in-store point-of-purchase presentations. Advertising expenses are included in selling and administrative expenses. Advertising expenses were $19.9 million and $20.1 million for the first quarter of 2017 and the first quarter of 2016, respectively.
Derivatives, Policy [Policy Text Block]	Derivative Instruments We use derivative instruments to mitigate the risk of market fluctuations in the price of diesel fuel that we expect to consume to support our outbound transportation of inventory to our stores. We do not enter into derivative instruments for speculative purposes. Our derivative instruments may consist of collar or swap contracts. Our current derivative instruments do not meet the requirements for cash flow hedge accounting. Instead, our derivative instruments are marked-to-market to determine their fair value and any gains or losses are recognized currently in other income (expense) on our consolidated statements of operations.
Comparability of Prior Year Financial Data, Policy [Policy Text Block]	Reclassifications Merchandise Categories We periodically assess, and make minor adjustments to, our product hierarchy, which can impact the roll-up of our merchandise categories. Our financial reporting process utilizes the most current product hierarchy in reporting net sales by merchandise category for all periods presented. Therefore, there may be minor reclassifications of net sales by merchandise category compared to previously reported amounts.
New Accounting Pronouncements, Policy [Policy Text Block]	Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers (Topic 606). This update provides a comprehensive new revenue recognition model that requires a company to recognize revenue to depict the transfer of goods or services to a customer at an amount that reflects the consideration it expects to receive in exchange for those goods or services. Additionally, this guidance expands related disclosure requirements. The pronouncement was originally set to be effective for annual and interim reporting periods beginning after December 15, 2016. In July 2015, the FASB approved a one-year deferral of the effective date from December 15, 2016 to December 15, 2017, but allowed for early adoption as of December 15, 2016. This ASU permits the use of either the retrospective or cumulative effect transition method. We are currently evaluating the impact this guidance will have on our consolidated financial statements as well as the expected adoption method. We do not currently anticipate a significant change in the timing of the recognition of our revenue or costs; although upon adoption of this standard, our principal versus agent presentation of an immaterial portion of our vendor relationships may be impacted. We currently anticipate adopting the new standard effective February 4, 2018, using the full retrospective method; however, this decision is not final and is subject to the completion of our analysis of the standard. We will continue to evaluate ASU 2014-09 through the date of adoption. In February 2016, the FASB issued ASU 2016-02, Leases. The update requires a lessee to recognize a liability to make lease payments and a right-of-use asset representing a right to use the underlying asset for the lease term on the balance sheet. The ASU is effective for fiscal years, and interim periods within those years, beginning after December 15, 2018, with early adoption permitted. We are currently evaluating both the impact that this standard will have on our consolidated financial statements and which method of adoption to employ. We do not currently anticipate early adopting this standard. Recently Adopted Accounting Standards In March 2016, the FASB issued ASU 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. This update makes several modifications to the accounting for employee share-based payment transactions, including the requirement to recognize the income tax deduction excess or deficiency of awards that vest or settle as income tax expense in the reporting period they vest or settle. Additionally, this update clarifies the presentation of certain components of share-based awards in the statement of cash flows. The ASU is effective for annual reporting periods beginning after December 15, 2016, and interim periods within those annual periods. We selected a modified retrospective method to adopt the recognition of the cumulative income tax effects and a prospective method for cash flow presentations. In the first quarter of 2017, we recorded a $3.1 million benefit to income tax expense. For 2016, $0.5 million of excess tax benefits were recorded to additional paid-in capital that would have been recorded as a reduction to the provision for income taxes if this new guidance had been adopted on a full retrospective basis. Additionally, we recorded an insignificant adjustment to retained earnings to change our accounting method from an estimated forfeiture rate approach to actual forfeiture approach, which accounts for forfeitures as they occur.