Basis of Presentation and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	May 05, 2018
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 2018 (“2018”) is comprised of the 52 weeks that began on February 4, 2018 and will end on February 2, 2019. Fiscal year 2017 (“2017”) was comprised of the 53 weeks that began on January 29, 2017 and ended on February 3, 2018. The fiscal quarters ended May 5, 2018 (“first quarter of 2018”) and April 29, 2017 (“first quarter of 2017”) 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 and 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 $42.9 million and $39.3 million for the first quarter of 2018 and the first quarter of 2017, respectively.
Advertising Costs, Policy [Policy Text Block]	Advertising Expense Advertising costs, which are expensed as incurred, consist primarily of television and print advertising, digital, internet or e-mail marketing and advertising, and in-store point-of-purchase signage and presentations. Advertising expenses are included in selling and administrative expenses. Advertising expenses were $22.0 million and $19.9 million for the first quarter of 2018 and the first quarter of 2017, 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 and comprehensive income.
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 February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-02, Leases (Topic 842). The update requires a lessee to recognize, on the balance sheet, a liability to make lease payments and a right-of-use asset representing a right to use the underlying asset for the lease term. The ASU is effective for fiscal years, and interim periods within those years, beginning after December 15, 2018, with early adoption permitted. The ASU allows for either the modified or full retrospective method of adoption. However, the FASB recently issued Proposed ASU No. 2018-200, Leases (Topic 842), Targeted Improvements which would allow entities to apply the transition provisions of the new standard at its adoption date instead of at the earliest comparative period presented in the consolidated financial statements. The proposed ASU will allow entities to continue to apply the legacy guidance in Topic 840, Leases, including its disclosure requirements, in the comparative periods presented in the year the new leases standard is adopted. Entities that elect this option would still adopt the new leases standard using a modified retrospective transition method, but would recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption rather than in the earliest period presented. We are currently evaluating the impact that this standard will have on our consolidated financial statements and which practical expedients to employ during adoption. We will not early adopt this standard. Recently Adopted Accounting Standards In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606). This update provided 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 expanded related disclosure requirements. During the first quarter of 2018, we adopted the new standard on the retrospective method. The adoption had no impact on the timing of the recognition of our revenue or costs. The adoption did result in an immaterial adjustment to the amount of gross revenue and costs that we had previously reported, as certain of our vendor relationships had different principal versus agent treatment under the new standard. Additionally, we considered the disclosure requirements of the standard and determined that no additional disclosures were necessary.