Basis Of Presentation	6 Months Ended
Dec. 31, 2015
Basis Of Presentation [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	BASIS OF PRESENTATION The accompanying unaudited condensed consolidated financial statements of PAREXEL International Corporation (“PAREXEL,” the “Company,” “we,” “our” or “us”) have been prepared in accordance with generally accepted accounting principles ("GAAP") for interim financial information in the United States and the instructions of Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and notes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments (primarily consisting of normal recurring adjustments) considered necessary for a fair presentation of the Company’s financial position as of December 31, 2015, results of operations for the three and six months ended December 31, 2015 and 2014 have been included. Operating results for the three and six months ended December 31, 2015 are not necessarily indicative of the results that may be expected for other quarters or the entire fiscal year. For further information, refer to the audited consolidated financial statements and footnotes thereto included in our Annual Report on Form 10-K for the fiscal year ended June 30, 2015 (the “2015 10-K”) filed with the Securities and Exchange Commission on August 25, 2015. Recently Issued Accounting Standards In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which stipulates that an entity 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. To achieve this core principle, an entity should apply the following steps: (1) identify the contract(s) with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when (or as) the entity satisfies a performance obligation. As originally issued, ASU 2014-09 will be effective prospectively for fiscal years and interim periods within those years beginning after December 15, 2016. On July 9, 2015, the FASB approved the proposal to defer the effective date of this standard by one year. Early adoption is permitted for annual periods beginning after December 16, 2016. We are assessing the impact of adopting ASU No. 2014-09 on our consolidated financial statements. In June 2014, the FASB issued ASU No. 2014-12, Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period. ASU 2014-12 requires that a performance target that affects vesting and could be achieved after the requisite service period be treated as a performance condition. A reporting entity should apply existing guidance in Accounting Standards Codification (“ASC”) 718, Compensation—Stock Compensation, as it relates to such awards. ASU 2014-12 will be effective in the first quarter of our fiscal year ending June 30, 2017 with early adoption permitted using either of two methods: (1) prospective to all awards granted or modified after the effective date; or (2) retrospective to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all awards granted or modified thereafter, with the cumulative effect of applying ASU 2014-12 as an adjustment to the opening retained earnings balance as of the beginning of the earliest annual period presented in the financial statements. We do not expect the adoption of ASU No. 2014-12 to have a material impact on our consolidated financial statements. In February 2015, the FASB issued ASU No. 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis. ASU No. 2015-02 amended the process that a reporting entity must follow to determine whether it should consolidate certain types of legal entities. ASU 2015-02 is effective for fiscal years and interim periods within those years ending after December 15, 2015. Early application is permitted. We do not expect the adoption of ASU 2015-02 to have a material impact on our consolidated financial statements. In April 2015, the FASB issued ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs (“ASU 2015-03”). ASU 2015-03 requires the presentation of debt issuance costs in the consolidated balance sheets as a reduction to the related debt liability rather than as an asset. Amortization of debt issuance costs continues to be classified as interest expense. ASU 2015-03 is effective for fiscal years beginning after December 15, 2016 with early adoption permitted. We are assessing the impact of adopting ASU No. 2015-03 on our consolidated financial statements. In September 2015, the FASB issued ASU No. 2015-16 ("ASU 2015-16"), Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments. This ASU requires adjustments to provisional amounts that are identified during the measurement period of a business combination to be recognized in the reporting period in which the adjustment amounts are determined. Acquirers are no longer required to revise comparative information for prior periods as if the accounting for the business combination had been completed as of the acquisition date. The provisions of ASU 2015-16 are effective for reporting periods beginning after December 15, 2015. We are assessing the impact of adopting ASU No. 2015-16 on our consolidated financial statements. In November 2015, the FASB issued ASU No. 2015-17 ("ASU 2015-17"), Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes. This ASU simplifies the balance sheet classification of deferred taxes and requires that all deferred taxes be presented as noncurrent. ASU 2015-17 is effective for fiscal years beginning after December 15, 2016 with early adoption permitted. We are assessing the impact of adopting ASU No. 2015-17 on our consolidated financial statements. In January 2016, the FASB issued ASU No. 2016-01 ("ASU 2016-01"), Financial Instruments—Overall (Subtopic 825-10) Recognition and Measurement of Financial Assets and Financial Liabilities. This ASU is intended to provide users of financial statements with more useful information on the recognition, measurement, presentation, and disclosure of financial instruments. ASU 2016-01 is effective for fiscal years beginning after December 15, 2017 with early adoption permitted. We are assessing the impact of adopting ASU No. 2015-17 on our consolidated financial statements.

BASIS OF PRESENTATION

The accompanying unaudited condensed consolidated financial statements of PAREXEL International Corporation (“PAREXEL,” the “Company,” “we,” “our” or “us”) have been prepared in accordance with generally accepted accounting principles ("GAAP") for interim financial information in the United States and the instructions of Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and notes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments (primarily consisting of normal recurring adjustments) considered necessary for a fair presentation of the Company’s financial position as of December 31, 2015, results of operations for the three and six months ended December 31, 2015 and 2014 have been included. Operating results for the three and six months ended December 31, 2015 are not necessarily indicative of the results that may be expected for other quarters or the entire fiscal year. For further information, refer to the audited consolidated financial statements and footnotes thereto included in our Annual Report on Form 10-K for the fiscal year ended June 30, 2015 (the “2015 10-K”) filed with the Securities and Exchange Commission on August 25, 2015.

Recently Issued Accounting Standards

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which stipulates that an entity 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. To achieve this core principle, an entity should apply the following steps: (1) identify the contract(s) with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when (or as) the entity satisfies a performance obligation. As originally issued, ASU 2014-09 will be effective prospectively for fiscal years and interim periods within those years beginning after December 15, 2016. On July 9, 2015, the FASB approved the proposal to defer the effective date of this standard by one year. Early adoption is permitted for annual periods beginning after December 16, 2016. We are assessing the impact of adopting ASU No. 2014-09 on our consolidated financial statements.

In June 2014, the FASB issued ASU No. 2014-12, Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period. ASU 2014-12 requires that a performance target that affects vesting and could be achieved after the requisite service period be treated as a performance condition. A reporting entity should apply existing guidance in Accounting Standards Codification (“ASC”) 718, Compensation—Stock Compensation, as it relates to such awards. ASU 2014-12 will be effective in the first quarter of our fiscal year ending June 30, 2017 with early adoption permitted using either of two methods: (1) prospective to all awards granted or modified after the effective date; or (2) retrospective to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all awards granted or modified thereafter, with the cumulative effect of applying ASU 2014-12 as an adjustment to the opening retained earnings balance as of the beginning of the earliest annual period presented in the financial statements. We do not expect the adoption of ASU No. 2014-12 to have a material impact on our consolidated financial statements.

In February 2015, the FASB issued ASU No. 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis. ASU No. 2015-02 amended the process that a reporting entity must follow to determine whether it should consolidate certain types of legal entities. ASU 2015-02 is effective for fiscal years and interim periods within those years ending after December 15, 2015. Early application is permitted. We do not expect the adoption of ASU 2015-02 to have a material impact on our consolidated financial statements.

In April 2015, the FASB issued ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs (“ASU 2015-03”). ASU 2015-03 requires the presentation of debt issuance costs in the consolidated balance sheets as a reduction to the related debt liability rather than as an asset. Amortization of debt issuance costs continues to be classified as interest expense. ASU 2015-03 is effective for fiscal years beginning after December 15, 2016 with early adoption permitted. We are assessing the impact of adopting ASU No. 2015-03 on our consolidated financial statements.

In September 2015, the FASB issued ASU No. 2015-16 ("ASU 2015-16"), Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments. This ASU requires adjustments to provisional amounts that are identified during the measurement period of a business combination to be recognized in the reporting period in which the adjustment amounts are determined. Acquirers are no longer required to revise comparative information for prior periods as if the accounting for the business combination had been completed as of the acquisition date. The provisions of ASU 2015-16 are effective for reporting periods beginning after December 15, 2015. We are assessing the impact of adopting ASU No. 2015-16 on our consolidated financial statements.

In November 2015, the FASB issued ASU No. 2015-17 ("ASU 2015-17"), Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes. This ASU simplifies the balance sheet classification of deferred taxes and requires that all deferred taxes be presented as noncurrent. ASU 2015-17 is effective for fiscal years beginning after December 15, 2016 with early adoption permitted. We are assessing the impact of adopting ASU No. 2015-17 on our consolidated financial statements.

In January 2016, the FASB issued ASU No. 2016-01 ("ASU 2016-01"), Financial Instruments—Overall (Subtopic 825-10)

Recognition and Measurement of Financial Assets and Financial Liabilities. This ASU is intended to provide users of financial statements with more useful information on the recognition, measurement, presentation, and disclosure of financial instruments. ASU 2016-01 is effective for fiscal years beginning after December 15, 2017 with early adoption permitted. We are assessing the impact of adopting ASU No. 2015-17 on our consolidated financial statements.