Accounting Policies, by Policy (Policies)	9 Months Ended
Feb. 28, 2015
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	Basis of Presentation The accompanying consolidated financial statements are unaudited and have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) for interim financial information, and the Securities and Exchange Commission’s (“SEC”) instructions for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. The Company’s interim results are not necessarily indicative of the Company’s expected full year results. These unaudited consolidated financial statements should be read in conjunction with the Company’s audited, consolidated financial statements and related notes for the year ended May 31, 2014, included in the Company’s Annual Report on Form 10-K filed with the SEC on August 26, 2014.
Consolidation, Policy [Policy Text Block]	Basis of Consolidation The consolidated financial statements include the accounts of Immucor and all its subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation. There are no other entities controlled by the Company, either directly or indirectly.
New Accounting Pronouncements, Policy [Policy Text Block]	Impact of Recently Issued Accounting Standards Accounting Changes Adopted by the Company in Fiscal 2015 In November 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-17, Business Combinations: Pushdown Accounting (“ASU 2014-17”). ASU (“Update”) 2014-17 provides an acquired entity with an option to apply pushdown accounting in its separate financial statements upon occurrence of an event in which an acquirer obtains control of the acquired entity. The acquired entity may elect the option to apply pushdown accounting in the reporting period in which the change-in-control event occurs. If pushdown accounting is not applied in the reporting period in which the change-in-control event occurs, an acquired entity will have the option to elect to apply pushdown accounting in a subsequent reporting period as a change in accounting principle in accordance with ASC Topic 250, Accounting Changes and Error Corrections. If pushdown accounting is applied to an individual change-in-control event, that election is irrevocable. ASU 2014-17 also requires an acquired entity that elects the option to apply pushdown accounting in its separate financial statements to disclose information in the current reporting period that enables users of financial statements to evaluate the effect of pushdown accounting. The Company has adopted the amendments in ASU 2014-17, effective November 18, 2014, as the amendments in the Update are effective upon issuance. The adoption of ASU 2014-12 did not have a material impact on the Company’s consolidated financial statements. Accounting Changes Not Yet Adopted In February 2015, the FASB issued ASC Update No. 2015-02, Amendments to the Consolidation Analysis. Update 2015-02 amended the process that a reporting entity must perform to determine whether it should consolidate certain types of legal entities. Update 2015-02 is effective for the Company in the first quarter of fiscal 2017. Early application is permitted. The Company is evaluating the effect of adoption of ASU 2014-12 on its consolidated financial statements. In January 2015, the FASB issued ASU No. 2015-01, Income Statement - Extraordinary and Unusual Items (“ASU 2015-01”). The objective of this Update is to simplify the income statement presentation requirements by eliminating the concept of extraordinary items from U.S. GAAP. Eliminating the extraordinary classification simplifies income statement presentation by removing the concept of extraordinary items from consideration altogether. ASU 2015-01 will be effective for the Company in the first quarter of fiscal 2017. A reporting entity may apply the guidance prospectively. A reporting entity also may apply the guidance retrospectively to all prior periods presented in the financial statements. Early adoption is permitted provided that the guidance is applied from the beginning of the fiscal year of adoption. The adoption of ASU 2015-01 is not expected to have a material impact on the Company’s consolidated financial statement. In June 2014, the FASB issued an ASU on stock-based compensation, ASU 2014-12, Compensation – Stock Compensation, Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period (a consensus of the FASB Emerging Issues Task Force) (“ASU 2014-12”). The guidance applies to all reporting entities that grant their employees share-based payments in which the terms of the award provide that a performance target that affects vesting could be achieved after the requisite service period. The amendments require that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. For all entities, the amendments in this Update are effective for annual periods and interim periods within those annual periods beginning after December 15, 2015, which corresponds to the Company’s first quarter of fiscal 2017. Earlier adoption is permitted. The Company is evaluating the effect of adoption of ASU 2014-12 on its consolidated financial statements. In May 2014, the FASB and International Accounting Standards Board issued their converged standard on revenue recognition, ASU 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”). This standard outlines a single comprehensive model for companies to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. The core principle of the revenue model is that revenue is recognized when a customer obtains control of a good or service. A customer obtains control when it has the ability to direct the use of and obtain the benefits from the good or service. Transfer of control is not the same as transfer of risks and rewards, as it is considered in current guidance. The Company will also need to apply new guidance to determine whether revenue should be recognized over time or at a point in time. This standard is currently effective for the first interim period within annual reporting periods beginning after December 15, 2017, which corresponds to the Company’s first quarter of fiscal 2019. No early adoption is permitted under the current standard, and it is to be applied either retrospectively or as a cumulative-effect adjustment as of the date of adoption. In April 2015, the FASB has proposed a one-year deferral of the effective date of this standard along with an option to permit public entities to elect to adopt the amendments to this standard as of the original effective date. The Company is evaluating the effect of the adoption of ASU 2014-09 on its consolidated financial statements.

Accounting Policies, by Policy (Policies)

9 Months Ended

Feb. 28, 2015

Basis of Accounting, Policy [Policy Text Block]

Basis of Presentation

The accompanying consolidated financial statements are unaudited and have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) for interim financial information, and the Securities and Exchange Commission’s (“SEC”) instructions for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. The Company’s interim results are not necessarily indicative of the Company’s expected full year results. These unaudited consolidated financial statements should be read in conjunction with the Company’s audited, consolidated financial statements and related notes for the year ended May 31, 2014, included in the Company’s Annual Report on Form 10-K filed with the SEC on August 26, 2014.

Consolidation, Policy [Policy Text Block]

Basis of Consolidation

The consolidated financial statements include the accounts of Immucor and all its subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation. There are no other entities controlled by the Company, either directly or indirectly.

New Accounting Pronouncements, Policy [Policy Text Block]

Impact of Recently Issued Accounting Standards

Accounting Changes Adopted by the Company in Fiscal 2015

In November 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-17, Business Combinations: Pushdown Accounting (“ASU 2014-17”). ASU (“Update”) 2014-17 provides an acquired entity with an option to apply pushdown accounting in its separate financial statements upon occurrence of an event in which an acquirer obtains control of the acquired entity. The acquired entity may elect the option to apply pushdown accounting in the reporting period in which the change-in-control event occurs. If pushdown accounting is not applied in the reporting period in which the change-in-control event occurs, an acquired entity will have the option to elect to apply pushdown accounting in a subsequent reporting period as a change in accounting principle in accordance with ASC Topic 250, Accounting Changes and Error Corrections. If pushdown accounting is applied to an individual change-in-control event, that election is irrevocable. ASU 2014-17 also requires an acquired entity that elects the option to apply pushdown accounting in its separate financial statements to disclose information in the current reporting period that enables users of financial statements to evaluate the effect of pushdown accounting. The Company has adopted the amendments in ASU 2014-17, effective November 18, 2014, as the amendments in the Update are effective upon issuance. The adoption of ASU 2014-12 did not have a material impact on the Company’s consolidated financial statements.

Accounting Changes Not Yet Adopted

In February 2015, the FASB issued ASC Update No. 2015-02, Amendments to the Consolidation Analysis. Update 2015-02 amended the process that a reporting entity must perform to determine whether it should consolidate certain types of legal entities. Update 2015-02 is effective for the Company in the first quarter of fiscal 2017. Early application is permitted. The Company is evaluating the effect of adoption of ASU 2014-12 on its consolidated financial statements.

In January 2015, the FASB issued ASU No. 2015-01, Income Statement - Extraordinary and Unusual Items (“ASU 2015-01”). The objective of this Update is to simplify the income statement presentation requirements by eliminating the concept of extraordinary items from U.S. GAAP. Eliminating the extraordinary classification simplifies income statement presentation by removing the concept of extraordinary items from consideration altogether. ASU 2015-01 will be effective for the Company in the first quarter of fiscal 2017. A reporting entity may apply the guidance prospectively. A reporting entity also may apply the guidance retrospectively to all prior periods presented in the financial statements. Early adoption is permitted provided that the guidance is applied from the beginning of the fiscal year of adoption. The adoption of ASU 2015-01 is not expected to have a material impact on the Company’s consolidated financial statement.

In June 2014, the FASB issued an ASU on stock-based compensation, ASU 2014-12, Compensation – Stock Compensation, Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period (a consensus of the FASB Emerging Issues Task Force) (“ASU 2014-12”). The guidance applies to all reporting entities that grant their employees share-based payments in which the terms of the award provide that a performance target that affects vesting could be achieved after the requisite service period. The amendments require that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. For all entities, the amendments in this Update are effective for annual periods and interim periods within those annual periods beginning after December 15, 2015, which corresponds to the Company’s first quarter of fiscal 2017. Earlier adoption is permitted. The Company is evaluating the effect of adoption of ASU 2014-12 on its consolidated financial statements.

In May 2014, the FASB and International Accounting Standards Board issued their converged standard on revenue recognition, ASU 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”). This standard outlines a single comprehensive model for companies to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. The core principle of the revenue model is that revenue is recognized when a customer obtains control of a good or service. A customer obtains control when it has the ability to direct the use of and obtain the benefits from the good or service. Transfer of control is not the same as transfer of risks and rewards, as it is considered in current guidance. The Company will also need to apply new guidance to determine whether revenue should be recognized over time or at a point in time. This standard is currently effective for the first interim period within annual reporting periods beginning after December 15, 2017, which corresponds to the Company’s first quarter of fiscal 2019. No early adoption is permitted under the current standard, and it is to be applied either retrospectively or as a cumulative-effect adjustment as of the date of adoption. In April 2015, the FASB has proposed a one-year deferral of the effective date of this standard along with an option to permit public entities to elect to adopt the amendments to this standard as of the original effective date. The Company is evaluating the effect of the adoption of ASU 2014-09 on its consolidated financial statements.

- Definition

Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary.

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