Summary of Significant Accounting Policies	9 Months Ended
Jun. 30, 2015
Summary of Significant Accounting Policies [Abstract]
Summary of Significant Accounting Policies [Text Block]	Note 1. Summary of Significant Accounting Policies Basis of Presentation The accompanying financial statements present the consolidated financial position, results of operations and cash flows of AmerisourceBergen Corporation and its wholly owned subsidiaries (the “Company”) as of the dates and for the periods indicated. All intercompany accounts and transactions have been eliminated in consolidation. The accompanying unaudited consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”) for interim financial information, the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. In the opinion of management, all adjustments (consisting only of normal recurring accruals, except as otherwise disclosed herein) considered necessary to present fairly the financial position as of June 30, 2015 and the results of operations and cash flows for the interim periods ended June 30, 2015 and 2014 have been included. Certain information and footnote disclosures normally included in financial statements presented in accordance with U.S. GAAP, but which are not required for interim reporting purposes, have been omitted. The accompanying unaudited consolidated financial statements should be read in conjunction with the financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended September 30, 2014. The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect amounts reported in the financial statements and accompanying notes. Actual amounts could differ from these estimated amounts. In May 2014, the Financial Accounting Standards Board issued Accounting Standards Update No. 2014-09, “Revenue from Contracts with Customers (Topic 606)” (“ASU 2014-09”). ASU 2014-09 supersedes the revenue recognition requirements in Accounting Standards Codification 605 — Revenue Recognition and most industry-specific guidance throughout the Codification. ASU 2014-09 outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers. The standard’s core principle is that a company should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 was originally scheduled to be effective for annual reporting periods beginning after December 15, 2016, including interim periods within those reporting periods. In July 2015, the Financial Accounting Standards Board deferred the effective date of ASU 2014-09 by one year. Entities are permitted to adopt the standard as early as the original public entity effective date, and either full or modified retrospective application is required. The Company has not yet selected a transition method and is currently evaluating the impact of adopting this new accounting guidance. In April 2015, the Financial Accounting Standards Board issued Accounting Standards Update No. 2015-03, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs (“ASU 2015-03”). ASU 2015-03 is the result of the Financial Accounting Standards Board’s simplification initiative intended to improve U.S. GAAP by reducing costs and complexity while maintaining or enhancing the usefulness of related financial statement information. ASU 2015-03 specifies that debt issuance costs related to a note shall be reported in the balance sheet as a direct reduction from the face amount of the note. ASU 2015-03 is effective for annual reporting periods beginning after December 15, 2015, and interim periods within those fiscal years. ASU 2015-03 will require the Company to reclassify its capitalized debt issuance costs currently recorded as assets on the consolidated condensed balance sheets. ASU 2015-03 will have no effect on the Company’s results of operations or liquidity. As of June 30, 2015, there were no other recently issued accounting standards that will have a material impact on the Company’s financial position or results of operations upon their adoption.

Note 1. Summary of Significant Accounting Policies

Basis of Presentation

The accompanying financial statements present the consolidated financial position, results of operations and cash flows of AmerisourceBergen Corporation and its wholly owned subsidiaries (the “Company”) as of the dates and for the periods indicated. All intercompany accounts and transactions have been eliminated in consolidation.

The accompanying unaudited consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”) for interim financial information, the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. In the opinion of management, all adjustments (consisting only of normal recurring accruals, except as otherwise disclosed herein) considered necessary to present fairly the financial position as of June 30, 2015 and the results of operations and cash flows for the interim periods ended June 30, 2015 and 2014 have been included. Certain information and footnote disclosures normally included in financial statements presented in accordance with U.S. GAAP, but which are not required for interim reporting purposes, have been omitted. The accompanying unaudited consolidated financial statements should be read in conjunction with the financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended September 30, 2014.

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect amounts reported in the financial statements and accompanying notes. Actual amounts could differ from these estimated amounts.

In May 2014, the Financial Accounting Standards Board issued Accounting Standards Update No. 2014-09, “Revenue from Contracts with Customers (Topic 606)” (“ASU 2014-09”). ASU 2014-09 supersedes the revenue recognition requirements in Accounting Standards Codification 605 — Revenue Recognition and most industry-specific guidance throughout the Codification. ASU 2014-09 outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers. The standard’s core principle is that a company should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 was originally scheduled to be effective for annual reporting periods beginning after December 15, 2016, including interim periods within those reporting periods. In July 2015, the Financial Accounting Standards Board deferred the effective date of ASU 2014-09 by one year. Entities are permitted to adopt the standard as early as the original public entity effective date, and either full or modified retrospective application is required. The Company has not yet selected a transition method and is currently evaluating the impact of adopting this new accounting guidance.

In April 2015, the Financial Accounting Standards Board issued Accounting Standards Update No. 2015-03, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs (“ASU 2015-03”). ASU 2015-03 is the result of the Financial Accounting Standards Board’s simplification initiative intended to improve U.S. GAAP by reducing costs and complexity while maintaining or enhancing the usefulness of related financial statement information. ASU 2015-03 specifies that debt issuance costs related to a note shall be reported in the balance sheet as a direct reduction from the face amount of the note. ASU 2015-03 is effective for annual reporting periods beginning after December 15, 2015, and interim periods within those fiscal years. ASU 2015-03 will require the Company to reclassify its capitalized debt issuance costs currently recorded as assets on the consolidated condensed balance sheets. ASU 2015-03 will have no effect on the Company’s results of operations or liquidity.

As of June 30, 2015, there were no other recently issued accounting standards that will have a material impact on the Company’s financial position or results of operations upon their adoption.