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Summary of Significant Accounting Policies and Change in Accounting Principles (Policies)
 6 Months Ended
Dec. 28, 2013
Accounting Policies [Abstract]  
Basis of Accounting, Policy [Policy Text Block]
Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles ("GAAP") for interim financial information and with the instructions to Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals and other adjustments) considered necessary for a fair presentation have been included.
    
The Company’s sales of OTC pharmaceutical products are subject to the seasonal demands for cough/cold/flu and allergy products. In addition, the Company's animal health products are subject to the seasonal demand for flea and tick products, which typically peaks during the warmer weather months. Accordingly, operating results for the three and six months ended December 28, 2013 are not necessarily indicative of the results that may be expected for a full fiscal year. The unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and footnotes included in Perrigo Company’s Annual Report on Form 10-K for the year ended June 29, 2013.

The Company has five reportable segments, aligned primarily by type of product: Consumer Healthcare, Nutritionals, Rx Pharmaceuticals, API, and Specialty Sciences. In conjunction with the acquisition of Elan, the Company expanded its operating segments to include the Specialty Sciences segment, which is comprised of assets focused on the treatment of Multiple Sclerosis (Tysabri®) and Alzheimer's. In addition, the Company has an Other category that consists of the Israel Pharmaceutical and Diagnostic Products operating segment, which does not individually meet the quantitative thresholds required to be a separately reportable segment. This segment structure is consistent with the way management makes operating decisions, allocates resources and manages the growth and profitability of the Company’s business.     
Principles of Consolidation [Policy Text Block]
Principles of Consolidation

The condensed consolidated financial statements include the accounts of the Company and all majority-owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation.
Investment securities, Policy [Policy Text Block]
Investment Securities

The Company determines the appropriate classification of all investment securities as held-to-maturity, available-for-sale, or trading at the time of purchase and re-evaluates such classification as of each balance sheet date in accordance with ASC Topic 320, "Investments - Debt and Equity Securities". Investments in equity securities that have readily determinable fair values are classified and accounted for as available-for-sale. The Company assesses whether temporary or other-than-temporary gains or losses on its investment securities have occurred due to increases or declines in fair value or other market conditions. If losses are considered temporary, they are reported on a net of tax basis within Other Comprehensive Income ("OCI"). If losses are considered other-than-temporary, the credit loss portion is charged to operations and the non-credit loss portion is charged to OCI.
Equity Method Investments, Policy [Policy Text Block]
Equity Method Investments

The equity method of accounting is used for unconsolidated entities over which the Company has significant influence; generally this represents ownership interests of at least 20% and not more than 50%. Under the equity method of accounting, the Company records the investments at carrying value adjusted for a proportionate share of the profits and losses of these entities. The Company evaluates its equity method investments for recoverability in accordance with ASC Topic 323, "Investments - Equity Method and Joint Ventures". If the Company determines that a loss in the value of the investment is other than temporary, the investment is written down to its estimated fair value. Any such losses are recorded other expense, net. Evaluations of recoverability under ASC 323 are primarily based on projected cash flows. Due to uncertainties in the estimation process, actual results could differ from such estimates.
Pension and Other Postretirement Plans, Nonpension Benefits, Policy [Policy Text Block]
Defined Benefit Pension Plans

As part of the Elan acquisition, the Company assumed responsibility for the funding of two Irish defined benefit pension plans. The defined benefit pension plans were closed to new members in March 2009 and the future accrual of benefits ceased for active members of the plans on January 31, 2013. The defined benefit pension plans are managed externally and the related pension costs and liabilities are assessed in accordance with the advice of a qualified professional actuary. An actuarial valuation was completed at December 18, 2013, the date the Company acquired Elan, and at December 28, 2013.  Two significant assumptions, the discount rate and the expected rate of return on plan assets, are important elements of expense and/or liability measurement. The Company evaluates these assumptions with the assistance of an actuary. Other assumptions involve employee demographic factors such as retirement patterns, mortality, turnover and the rate of compensation increase.

Actuarial gains and losses are recognized using the corridor method. Under the corridor method, to the extent that any cumulative unrecognized net actuarial gain or loss exceeds 10% of the greater of the present value of the defined benefit obligation and the fair value of the plan assets, that portion is recognized over the expected average remaining working lives of the plan participants. Otherwise, the net actuarial gain or loss is recorded in OCI. The Company recognizes the funded status of benefit plans on the Consolidated Balance Sheets. In addition, the Company recognizes the gains or losses and prior service costs or credits that arise during the period but are not recognized as components of net periodic pension cost of the period as a component of OCI.
Recently Adopted Accounting Standards [Text Block]
Recently Adopted Accounting Standards

In February 2013, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2013-02, "Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income" ("ASU 2013-02"). Under ASU 2013-02, an entity is required to provide information about the amounts reclassified out of Accumulated Other Comprehensive Income ("AOCI") by component. In addition, an entity is required to present, either on the face of the financial statements or in the notes, significant amounts reclassified out of AOCI by the respective line items of net income, but only if the amount reclassified is required to be reclassified in its entirety in the same reporting period. For amounts that are not required to be reclassified in their entirety to net income, an entity is required to cross-reference to other disclosures that provide additional details about those amounts. ASU 2013-02 does not change the current requirements for reporting net income or other comprehensive income in the financial statements. ASU 2013-02 was effective for the Company in the first quarter of fiscal 2014. The additional disclosures required by this ASU have been included in Note 11. Because this standard only impacts presentation and disclosure requirements, its adoption did not impact the Company's consolidated results of operations or financial condition.
        
In July 2012, the FASB issued ASU 2012-02, "Intangibles-Goodwill and Other (ASC Topic 350): Testing Indefinite-Lived Intangible Assets for Impairment." This amendment was made to simplify the asset impairment test. It allows an organization the option to first assess the qualitative factors to determine whether it is necessary to perform the quantitative impairment test. An organization that elects to perform a qualitative assessment is no longer required to calculate the fair value of an indefinite-lived intangible asset unless the organization determines, based on a qualitative assessment, that it is “more likely than not” that the asset is impaired. This ASU is effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012, although early adoption is also permitted. This guidance was effective for the Company in the first quarter of fiscal 2014 and did not have any effect on the Company's consolidated results of operations or financial condition.

In December 2011, the FASB issued ASU 2011-11 “Disclosures about Offsetting Assets and Liabilities” ("ASU 2011-11"), as clarified with ASU 2013-01 “Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities” ("ASU 2013-01") issued in January 2013. These common disclosure requirements are intended to help investors and other financial statement users better assess the effect or potential effect of offsetting arrangements on a portfolio’s financial position. They also improve transparency in the reporting of how companies mitigate credit risk, including disclosure of related collateral pledged or received. In addition, ASU 2011-11 facilitates comparison between those entities that prepare their financial statements on the basis of U.S. GAAP and those entities that prepare their financial statements on the basis of International Financial Reporting Standards. ASU 2011-11 requires entities to disclose both gross and net information about both instruments and transactions eligible for offset in the statement of financial position, and disclose instruments and transactions subject to an agreement similar to a master netting agreement. Both ASU 2011-11 and ASU 2013-01 were effective for the Company in the first quarter of fiscal 2014. Because this standard only impacts presentation and disclosure requirements, its adoption did not impact the Company's consolidated results of operations or financial condition.