Basis of Presentation	6 Months Ended
Basis of Presentation	Feb. 29, 2012
Notes to Financial Statements [Abstract]
Basis of Presentation	Note 1. Basis of Presentation The consolidated condensed financial statements of Walgreen Co. and subsidiaries included herein have been prepared by the Company pursuant to the rules and regulations of the Securities and Exchange Commission regarding interim financial reporting. The Consolidated Condensed Balance Sheets as of February 29, 2012, August 31, 2011 and February 28, 2011, the Consolidated Condensed Statements of Earnings for the three and six months ended February 29, 2012 and February 28, 2011, and the Consolidated Condensed Statements of Cash Flows for the six months ended February 29, 2012 and February 28, 2011, have been prepared without audit. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted pursuant to such rules and regulations, although the Company believes that the disclosures are adequate to make the information presented not misleading. These unaudited consolidated condensed financial statements should be read in conjunction with the audited financial statements and the notes thereto included in the Company's Annual Report on Form 10-K for the fiscal year ended August 31, 2011. In the opinion of the Company, the consolidated condensed financial statements for the unaudited interim periods presented include all adjustments (consisting only of normal recurring adjustments) necessary to present a fair statement of the results for such interim periods. Because of the influence of certain holidays, seasonal, changes in vendor, payer and customer relationships and terms and other factors on the Company's operations, net earnings for any interim period may not be comparable to the same interim period in previous years or indicative of net earnings for the full fiscal year. The consolidated condensed financial statements include the accounts of the Company and its subsidiaries. All intercompany transactions have been eliminated. The preparation of financial statements in accordance with accounting principles generally accepted in the United States of America requires management to use judgment in the application of accounting policies, including making estimates and assumptions. We base estimates on the information available to us at the time, our experience and on various other assumptions believed to be reasonable under the circumstances. Adjustments may be made in subsequent periods to reflect more current estimates and assumptions about matters that are inherently uncertain. Actual results may differ. For a discussion of the Company’s significant accounting policies, please see the Company’s Annual Report on Form 10-K for the fiscal year ended August 31, 2011.

Description containing the entire organization, consolidation and basis of presentation of financial statements disclosure. May be provided in more than one note to the financial statements, as long as users are provided with an understanding of (1) the significant judgments and assumptions made by an enterprise in determining whether it must consolidate a VIE and/or disclose information about its involvement with a VIE, (2) the nature of restrictions on a consolidated VIE's assets reported by an enterprise in its statement of financial position, including the carrying amounts of such assets, (3) the nature of, and changes in, the risks associated with an enterprise's involvement with the VIE, and (4) how an enterprise's involvement with the VIE affects the enterprise's financial position, financial performance, and cash flows. Describes procedure if disclosures are provided in more than one note to the financial statements.

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