Accounting Policies	6 Months Ended
Feb. 28, 2017
Accounting Policies [Abstract]
Accounting Policies	Accounting Policies Basis of Presentation The Consolidated Condensed Financial Statements of Walgreens Boots Alliance, Inc. (“Walgreens Boots Alliance” or the "Company") included herein have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission regarding interim financial reporting. The Consolidated Condensed Financial Statements include all subsidiaries in which the Company holds a controlling interest. Investments in less than majority-owned subsidiaries in which the Company does not have a controlling interest, but does have significant influence, are accounted for as equity method investments. All intercompany transactions have been eliminated. The Consolidated Condensed Balance Sheet as of February 28, 2017, the Consolidated Condensed Statement of Equity for the six months ended February 28, 2017, and the Consolidated Condensed Statements of Earnings, the Consolidated Condensed Statements of Comprehensive Income and the Consolidated Condensed Statements of Cash Flows for the three and six months ended February 28, 2017 and February 29, 2016 are unaudited. Certain information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) 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 Walgreens Boots Alliance Annual Report on Form 10-K for the fiscal year ended August 31, 2016. In the opinion of the Company, the unaudited Consolidated Condensed Financial Statements for the 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. The influence of certain holidays, seasonality, foreign currency rates, changes in vendor, payer and customer relationships and terms and other factors on the Company’s operations, net earnings for any period may not be comparable to the same period in previous years. With respect to the Company’s Retail Pharmacy USA segment, the positive impact on gross margins and gross profit dollars typically has been significant in the first several months after a generic version of a drug is first allowed to compete with the branded version, which is generally referred to as a “generic conversion.” In any given year, the number of major brand name drugs that undergo a conversion from branded to generic status can increase or decrease, which can have a significant impact on the Company’s Retail Pharmacy USA segment’s sales, gross margin and gross profit dollars making the Company’s operations or net earnings for any period incomparable. To improve comparability, certain classification changes were made to prior periods to conform to current year classifications. These reclassifications were made in the fourth quarter of fiscal 2016. On October 27, 2015, Walgreens Boots Alliance entered into an Agreement and Plan of Merger with Rite Aid Corporation (“Rite Aid”) and Victoria Merger Sub, Inc., a wholly-owned subsidiary of Walgreens Boots Alliance (as amended as described below, the “Merger Agreement”), pursuant to which the Company agreed, subject to the terms and conditions thereof, to acquire Rite Aid, a drugstore chain in the United States with 4,547 stores in 31 states and the District of Columbia as of November 26, 2016. The Merger Agreement was amended by Amendment No. 1 (the “Amendment”) on January 29, 2017. Under the terms of the Amendment, the parties agreed to reduce the price for each share of Rite Aid common stock to be paid by Walgreens Boots Alliance upon closing to a maximum of $7.00 per share and a minimum of $6.50 per share. In addition, Walgreens Boots Alliance will be required to divest up to 1,200 Rite Aid stores and certain additional related assets if required to obtain regulatory approval. The exact price per share will be determined based on the number of required store divestitures, with the price set at $7.00 per share if 1,000 stores or fewer are required for divestiture and at $6.50 per share if 1,200 stores are required for divestiture. If the required divestitures fall between 1,000 and 1,200 stores, then there will be a pro-rata adjustment of the price per share. Additionally, Walgreens Boots Alliance and Rite Aid agreed to extend the end date under the Merger Agreement to July 31, 2017 in order to allow the parties additional time to obtain regulatory approval. The transaction is subject to approval by the holders of Rite Aid’s common stock, the expiration or termination of applicable waiting periods under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, and other customary closing conditions. On December 20, 2016, Walgreens Boots Alliance and Rite Aid announced that they have entered into an agreement to sell 865 Rite Aid stores and certain assets related to store operations to Fred’s, Inc. (“Fred’s”) for $950 million in an all-cash transaction. The transaction is subject to Federal Trade Commission (“FTC”) approval, the approval and completion of the pending acquisition of Rite Aid by Walgreens Boots Alliance pursuant to the Merger Agreement, and other customary closing conditions. If the FTC requires divestiture of more than the 865 Rite Aid stores currently contemplated by the purchase agreement and Walgreens Boots Alliance agrees to sell such stores, the purchase agreement requires Fred’s to purchase such additional stores.

Accounting Policies

Basis of Presentation

The Consolidated Condensed Financial Statements of Walgreens Boots Alliance, Inc. (“Walgreens Boots Alliance” or the "Company") included herein have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission regarding interim financial reporting. The Consolidated Condensed Financial Statements include all subsidiaries in which the Company holds a controlling interest. Investments in less than majority-owned subsidiaries in which the Company does not have a controlling interest, but does have significant influence, are accounted for as equity method investments. All intercompany transactions have been eliminated.

The Consolidated Condensed Balance Sheet as of February 28, 2017, the Consolidated Condensed Statement of Equity for the six months ended February 28, 2017, and the Consolidated Condensed Statements of Earnings, the Consolidated Condensed Statements of Comprehensive Income and the Consolidated Condensed Statements of Cash Flows for the three and six months ended February 28, 2017 and February 29, 2016 are unaudited. Certain information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) 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 Walgreens Boots Alliance Annual Report on Form 10-K for the fiscal year ended August 31, 2016.

In the opinion of the Company, the unaudited Consolidated Condensed Financial Statements for the 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. The influence of certain holidays, seasonality, foreign currency rates, changes in vendor, payer and customer relationships and terms and other factors on the Company’s operations, net earnings for any period may not be comparable to the same period in previous years. With respect to the Company’s Retail Pharmacy USA segment, the positive impact on gross margins and gross profit dollars typically has been significant in the first several months after a generic version of a drug is first allowed to compete with the branded version, which is generally referred to as a “generic conversion.” In any given year, the number of major brand name drugs that undergo a conversion from branded to generic status can increase or decrease, which can have a significant impact on the Company’s Retail Pharmacy USA segment’s sales, gross margin and gross profit dollars making the Company’s operations or net earnings for any period incomparable.

To improve comparability, certain classification changes were made to prior periods to conform to current year classifications. These reclassifications were made in the fourth quarter of fiscal 2016.

On October 27, 2015, Walgreens Boots Alliance entered into an Agreement and Plan of Merger with Rite Aid Corporation (“Rite Aid”) and Victoria Merger Sub, Inc., a wholly-owned subsidiary of Walgreens Boots Alliance (as amended as described below, the “Merger Agreement”), pursuant to which the Company agreed, subject to the terms and conditions thereof, to acquire Rite Aid, a drugstore chain in the United States with 4,547 stores in 31 states and the District of Columbia as of November 26, 2016. The Merger Agreement was amended by Amendment No. 1 (the “Amendment”) on January 29, 2017. Under the terms of the Amendment, the parties agreed to reduce the price for each share of Rite Aid common stock to be paid by Walgreens Boots Alliance upon closing to a maximum of $7.00 per share and a minimum of $6.50 per share. In addition, Walgreens Boots Alliance will be required to divest up to 1,200 Rite Aid stores and certain additional related assets if required to obtain regulatory approval. The exact price per share will be determined based on the number of required store divestitures, with the price set at $7.00 per share if 1,000 stores or fewer are required for divestiture and at $6.50 per share if 1,200 stores are required for divestiture. If the required divestitures fall between 1,000 and 1,200 stores, then there will be a pro-rata adjustment of the price per share. Additionally, Walgreens Boots Alliance and Rite Aid agreed to extend the end date under the Merger Agreement to July 31, 2017 in order to allow the parties additional time to obtain regulatory approval. The transaction is subject to approval by the holders of Rite Aid’s common stock, the expiration or termination of applicable waiting periods under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, and other customary closing conditions.

On December 20, 2016, Walgreens Boots Alliance and Rite Aid announced that they have entered into an agreement to sell 865 Rite Aid stores and certain assets related to store operations to Fred’s, Inc. (“Fred’s”) for $950 million in an all-cash transaction. The transaction is subject to Federal Trade Commission (“FTC”) approval, the approval and completion of the pending acquisition of Rite Aid by Walgreens Boots Alliance pursuant to the Merger Agreement, and other customary closing conditions. If the FTC requires divestiture of more than the 865 Rite Aid stores currently contemplated by the purchase agreement and Walgreens Boots Alliance agrees to sell such stores, the purchase agreement requires Fred’s to purchase such additional stores.