1. Basis of presentation  The accompanying unaudited condensed consolidated financial statements of Dollar General Corporation and its subsidiaries (the Company) have been prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) for interim financial information and are presented in accordance with the requirements of Form 10-Q and Rule 10-01 of Regulation S-X. Such financial statements consequently do not include all of the disclosures normally required by U.S. GAAP for annual financial statements or those normally made in the Companys Annual Report on Form 10-K, including the condensed consolidated balance sheet as of January 31, 2020 which was derived from the audited consolidated financial statements at that date. Accordingly, readers of this Quarterly Report on Form 10-Q should refer to the Companys Annual Report on Form 10-K for the fiscal year ended January 31, 2020 for additional information.  The Companys fiscal year ends on the Friday closest to January 31. Unless the context requires otherwise, references to years contained herein pertain to the Companys fiscal year. The Companys 2020 fiscal year is scheduled to be a 52-week accounting period ending on January 29, 2021, and the 2019 fiscal year was a 52-week accounting period that ended on January 31, 2020.  The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with the Companys customary accounting practices. In managements opinion, all adjustments (which are of a normal recurring nature) necessary for a fair presentation of the consolidated financial position as of July 31, 2020 and results of operations for the 13-week and 26-week accounting periods ended July 31, 2020 and August 2, 2019 have been made.  The preparation of financial statements and related disclosures in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates. Because the Companys business is moderately seasonal, the results for interim periods are not necessarily indicative of the results to be expected for the entire year. In addition, the effect of the COVID-19 pandemic on consumer behavior in the quarterly and year to date periods ended May 1, 2020 and July 31, 2020 resulted in a departure from seasonal norms experienced in recent years and may continue to disrupt the historical quarterly cadence of the Companys results of operations for an unknown period of time.  The Company uses the last-in, first-out (LIFO) method of valuing inventory. An actual valuation of inventory under the LIFO method is made at the end of each year based on the inventory levels and costs at that time. Accordingly, interim LIFO calculations are based on managements estimates of expected year-end inventory levels, sales for the year and the expected rate of inflation or deflation for the year. The interim LIFO calculations are subject to adjustment in the final year-end LIFO inventory valuation. The Company recorded a LIFO provision of $0.1 million and $3.2 million in the respective 13-week periods, and $1.7 million and $6.6 million in the respective 26-week periods, ended July 31, 2020 and August 2, 2019. In addition, ongoing estimates of inventory shrinkage and initial markups and markdowns are included in the interim cost of goods sold calculation.  The Company adopted new accounting guidance related to leases as of February 2, 2019. The cumulative effect of applying the standard resulted in an adjustment to retained earnings of $28.8 million at February 2, 2019, primarily for the elimination of deferred gain on a 2013 sale-leaseback transaction. Because the standard was adopted under the modified retrospective approach, it did not impact the Companys historical consolidated net income or cash flows.  In August 2018, the Financial Accounting Standards Board (FASB) issued guidance related to the accounting for implementation costs incurred in a cloud computing arrangement that is a service contract. These amendments align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software, as well as hosting arrangements that include an internal use software license. This guidance is effective for public business entities for fiscal years, and interim periods within those years, beginning after December 15, 2019, and early adoption is permitted. The Company adopted this guidance on a prospective basis and such adoption had an immaterial effect on the Companys consolidated financial position and results of operations.  In August 2018, the FASB also issued guidance related to the disclosure requirements for fair value measurement. This guidance added, modified, and removed certain disclosure requirements related to assets and liabilities recorded at fair value. The majority of this guidance pertains to assets and liabilities classified in Level 3 of the fair value hierarchy, and the Company has no such assets or liabilities. This guidance is effective for public business entities for fiscal years, and interim periods within those years, beginning after December 15, 2019, and early adoption is permitted. The adoption of this guidance did not affect the Companys consolidated results of operations, financial position or cash flows.  In January 2017, the FASB issued amendments to existing guidance related to the subsequent measurement of goodwill. Subsequent to adoption, the Company will perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting units fair value. This guidance is effective for public business entities for fiscal years, and interim periods within those years, beginning after December 15, 2019, and early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The amendments are being applied on a prospective basis. The adoption of this guidance did not affect the Companys consolidated results of operations, financial position or cash flows.  In June 2016, the FASB issued guidance related to measurement requirements for credit losses on financial instruments. These amendments require a financial asset or a group of financial assets measured at amortized cost basis to be presented at the net amount expected to be collected. The guidance requires measurement of expected credit losses based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts. This guidance is effective for public business entities for fiscal years, and interim periods within those years, beginning after December 15, 2019, and early adoption is permitted. The adoption of this guidance did not affect the Companys consolidated results of operations, financial position or cash flows.