Basis of Presentation	6 Months Ended
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BASIS OF PRESENTATION	BASIS OF PRESENTATION The accompanying Condensed Consolidated Financial Statements include the accounts of Open Text Corporation and our subsidiaries, collectively referred to as "OpenText" or the "Company". We wholly own all of our subsidiaries with the exception of Open Text South Africa Proprietary Ltd. (OT South Africa), GXS, Inc. (GXS Korea) and EC1 Pte. Ltd. (GXS Singapore), which as of December 31, 2017, were 70%, 85% and 81% owned, respectively, by OpenText. All inter-company balances and transactions have been eliminated. Throughout this Quarterly Report on Form 10-Q: (i) the term “Fiscal 2018” means our fiscal year beginning on July 1, 2017 and ending June 30, 2018; (ii) the term “Fiscal 2017” means our fiscal year beginning on July 1, 2016 and ended June 30, 2017; (iii) the term “Fiscal 2016” means our fiscal year beginning on July 1, 2015 and ended June 30, 2016; (iv) the term "Fiscal 2015" means our fiscal year beginning on July 1, 2014 and ended June 30, 2015; and (v) the term "Fiscal 2014" means our fiscal year beginning on July 1, 2013 and ended June 30, 2014. These Condensed Consolidated Financial Statements are expressed in U.S. dollars and are prepared in accordance with United States generally accepted accounting principles (U.S. GAAP). The information furnished reflects all adjustments necessary for a fair presentation of the results for the periods presented and includes the financial results of Covisint Corporation (Covisint), with effect from July 26, 2017 and Guidance Software, Inc. (Guidance), with effect from September 14, 2017 (see note 18 "Acquisitions"). Use of estimates The preparation of financial statements in conformity with U.S. GAAP requires us to make estimates, judgments and assumptions that affect the amounts reported in the Condensed Consolidated Financial Statements. These estimates, judgments and assumptions are evaluated on an ongoing basis. We base our estimates on historical experience and on various other assumptions that we believe are reasonable at that time, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from those estimates. In particular, significant estimates, judgments and assumptions include those related to: (i) revenue recognition, (ii) testing of goodwill for impairment, (iii) the valuation of acquired intangible assets, (iv) the valuation of long-lived assets, (v) the recognition of contingencies, (vi) restructuring accruals, (vii) acquisition accruals and pre-acquisition contingencies, (viii) the realization of investment tax credits, (ix) the valuation of stock options granted and obligations related to share-based payments, including the valuation of our long-term incentive plans, (x) the valuation of pension assets and obligations, and (xi) accounting for income taxes. During the second quarter of Fiscal 2018, our income tax estimates were impacted by an Act to provide for the reconciliation pursuant to titles II and IV of the concurrent resolution on the budget for fiscal year 2018, informally titled the Tax Cuts and Jobs Act, which was enacted in the United States on December 22, 2017. The Company recorded a provisional charge in the second quarter of Fiscal 2018 and continues to assess the effect of the new law on its consolidated financial statements in accordance with Staff Accounting Bulletin 118 “Income Tax Accounting Implications of the Tax Cuts and Jobs Act” (SAB 118). For more details related to this matter, please refer to note 14 "Income Taxes".

BASIS OF PRESENTATION

The accompanying Condensed Consolidated Financial Statements include the accounts of Open Text Corporation and our subsidiaries, collectively referred to as "OpenText" or the "Company". We wholly own all of our subsidiaries with the exception of Open Text South Africa Proprietary Ltd. (OT South Africa), GXS, Inc. (GXS Korea) and EC1 Pte. Ltd. (GXS Singapore), which as of December 31, 2017, were 70%, 85% and 81% owned, respectively, by OpenText. All inter-company balances and transactions have been eliminated.

Throughout this Quarterly Report on Form 10-Q: (i) the term “Fiscal 2018” means our fiscal year beginning on July 1, 2017 and ending June 30, 2018; (ii) the term “Fiscal 2017” means our fiscal year beginning on July 1, 2016 and ended June 30, 2017; (iii) the term “Fiscal 2016” means our fiscal year beginning on July 1, 2015 and ended June 30, 2016; (iv) the term "Fiscal 2015" means our fiscal year beginning on July 1, 2014 and ended June 30, 2015; and (v) the term "Fiscal 2014" means our fiscal year beginning on July 1, 2013 and ended June 30, 2014.

These Condensed Consolidated Financial Statements are expressed in U.S. dollars and are prepared in accordance with United States generally accepted accounting principles (U.S. GAAP). The information furnished reflects all adjustments necessary for a fair presentation of the results for the periods presented and includes the financial results of Covisint Corporation (Covisint), with effect from July 26, 2017 and Guidance Software, Inc. (Guidance), with effect from September 14, 2017 (see note 18 "Acquisitions").

Use of estimates

The preparation of financial statements in conformity with U.S. GAAP requires us to make estimates, judgments and assumptions that affect the amounts reported in the Condensed Consolidated Financial Statements. These estimates, judgments and assumptions are evaluated on an ongoing basis. We base our estimates on historical experience and on various other assumptions that we believe are reasonable at that time, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from those estimates. In particular, significant estimates, judgments and assumptions include those related to: (i) revenue recognition, (ii) testing of goodwill for impairment, (iii) the valuation of acquired intangible assets, (iv) the valuation of long-lived assets, (v) the recognition of contingencies, (vi) restructuring accruals, (vii) acquisition accruals and pre-acquisition contingencies, (viii) the realization of investment tax credits, (ix) the valuation of stock options granted and obligations related to share-based payments, including the valuation of our long-term incentive plans, (x) the valuation of pension assets and obligations, and (xi) accounting for income taxes. During the second quarter of Fiscal 2018, our income tax estimates were impacted by an Act to provide for the reconciliation pursuant to titles II and IV of the concurrent resolution on the budget for fiscal year 2018, informally titled the Tax Cuts and Jobs Act, which was enacted in the United States on December 22, 2017. The Company recorded a provisional charge in the second quarter of Fiscal 2018 and continues to assess the effect of the new law on its consolidated financial statements in accordance with Staff Accounting Bulletin 118 “Income Tax Accounting Implications of the Tax Cuts and Jobs Act” (SAB 118). For more details related to this matter, please refer to note 14 "Income Taxes".