SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	3 Months Ended
Jun. 30, 2019
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	BASIS OF PRESENTATION AND CONSOLIDATION The Company's fiscal year ends on March 31 of each calendar year. Each reference to a fiscal year in these notes to the condensed consolidated financial statements refers to the fiscal year ended March 31 of the calendar year indicated (for example, fiscal 2020 refers to the fiscal year ending March 31, 2020). The accompanying interim condensed consolidated financial statements are unaudited and have been prepared on substantially the same basis as our annual consolidated financial statements for the fiscal year ended March 31, 2019 with the exception of new lease accounting guidance discussed in the recently adopted accounting principles section below. Certain information and note disclosures normally included in the financial statements prepared in accordance with U.S. generally accepted accounting principles ("GAAP") have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission (the "SEC"), regarding interim financial reporting. In the opinion of the Company's management, these interim condensed consolidated financial statements reflect all adjustments (consisting only of normal recurring adjustments) considered necessary for a fair statement of our financial position, results of operations, and cash flows for the periods presented. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements, and the reported amounts of revenue and expenses during the reporting periods. Actual results could differ from these estimates. The March 31, 2019 year-end condensed consolidated balance sheet data in this document were derived from audited consolidated financial statements and does not include all of the disclosures required by GAAP. These condensed consolidated financial statements should be read in conjunction with the Company's audited consolidated financial statements as of and for the fiscal year ended March 31, 2019 and notes thereto included in the Company's fiscal 2019 Annual Report on Form 10-K. The results of operations and cash flows for the interim periods included in these condensed consolidated financial statements are not necessarily indicative of the results to be expected for any future period or the entire fiscal year. The condensed consolidated financial statements include the accounts of 8x8 and its subsidiaries. All material intercompany accounts and transactions have been eliminated. USE OF ESTIMATES The preparation of the condensed consolidated financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities and equity and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. On an ongoing basis, the Company evaluates its estimates, including, but not limited to, those related to bad debts, returns reserve for expected cancellations, income and sales tax liabilities, stock-based compensation, and litigation and other contingencies. The Company bases its estimates on historical experience and on various other assumptions. Actual results could differ from those estimates under different assumptions or conditions. RECLASSIFICATIONS AND OTHER CHANGES Certain prior year amounts in the statement of cash flows have been reclassified to conform with current year presentation. SIGNIFICANT ACCOUNTING POLICIES The significant accounting policies used in preparation of these condensed consolidated financial statements are disclosed in our Annual Report on Form 10-K for the fiscal year ended March 31, 2019 filed with the SEC on May 21, 2019, and there have been no changes to the Company's significant accounting policies during the three months ended June 30, 2019 except for the accounting policies described below that were updated as a result of adopting Accounting Standards Update ("ASU") 2016-02, Leases. All amounts and disclosures set forth herein are in compliance with this standard. RECENTLY ADOPTED ACCOUNTING PRONOUNCEMENTS Effective April 1, 2019, the Company adopted ASU No. 2016-02 (“ASU 2016-02”), Leases using the modified retrospective transition approach utilizing the effective date as the date of initial application. ASU 2016-02 establishes a new lease accounting model for leases, which requires lessees to recognize right-of-use assets and lease liabilities on the balance sheet, but lease expense will be recognized on the income statement in a manner similar to previous requirements. Prior years presented have not been adjusted for ASU 2016-02 and continue to be reported in accordance with our historical accounting policy. The new standard provides a number of optional practical expedients in transition. The Company has elected the package of practical expedients permitted under the new lease standard, which among other things, allows the carryforward the historical lease classification. As a result, there was no impact to opening retained earnings. The new standard also provides a practical expedient for an entity’s ongoing accounting. The Company has elected such practical expedient to not separate lease and non-lease components for all leases. It also made an accounting policy election to not recognize right-of-use assets and lease liabilities on the balance sheet for leases with a term of 12 months or less and will recognize lease payments as an expense on a straight-line basis over the lease term. The adoption of the new lease standard resulted in the recognition of right-of-use assets and lease liabilities of approximately $20.0 million and $21.4 million, respectively, for existing operating leases. The adoption of the new lease standard did not have a material impact on the Company's accumulated deficit as of April 1, 2019. For additional information on leases and the impact of the new lease standard, refer to Note 6. RECENT ACCOUNTING PRONOUNCEMENTS In August 2018, the Financial Accounting Standards Board ("FASB") issued ASU 2018-13, Fair Value Measurement (Topic 820), which makes modifications to disclosure requirements on fair value measurements. The amendment is effective for public companies with fiscal years beginning after December 15, 2019. Early adoption is permitted. The Company is currently assessing the impact of this pronouncement to its condensed consolidated financial statements. In August 2018, the FASB issued ASU 2018-15, Intangibles-Goodwill and Other-Internal Use Software (Subtopic 350-40), which reduces complexity for the accounting for costs of implementing a cloud computing service arrangement. The amendment is effective for public companies with fiscal years beginning after December 15, 2019. Early adoption is permitted. The Company is currently assessing the impact of this pronouncement to its condensed consolidated financial statements.

The Company's fiscal year ends on March 31 of each calendar year. Each reference to a fiscal year in these notes to the condensed consolidated financial statements refers to the fiscal year ended March 31 of the calendar year indicated (for example, fiscal 2020 refers to the fiscal year ending March 31, 2020).

The accompanying interim condensed consolidated financial statements are unaudited and have been prepared on substantially the same basis as our annual consolidated financial statements for the fiscal year ended March 31, 2019 with the exception of new lease accounting guidance discussed in the recently adopted accounting principles section below. Certain information and note disclosures normally included in the financial statements prepared in accordance with U.S. generally accepted accounting principles ("GAAP") have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission (the "SEC"), regarding interim financial reporting.

In the opinion of the Company's management, these interim condensed consolidated financial statements reflect all adjustments (consisting only of normal recurring adjustments) considered necessary for a fair statement of our financial position, results of operations, and cash flows for the periods presented. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements, and the reported amounts of revenue and expenses during the reporting periods. Actual results could differ from these estimates.

The March 31, 2019 year-end condensed consolidated balance sheet data in this document were derived from audited consolidated financial statements and does not include all of the disclosures required by GAAP. These condensed consolidated financial statements should be read in conjunction with the Company's audited consolidated financial statements as of and for the fiscal year ended March 31, 2019 and notes thereto included in the Company's fiscal 2019 Annual Report on Form 10-K.

The results of operations and cash flows for the interim periods included in these condensed consolidated financial statements are not necessarily indicative of the results to be expected for any future period or the entire fiscal year.

The condensed consolidated financial statements include the accounts of 8x8 and its subsidiaries. All material intercompany accounts and transactions have been eliminated.

The preparation of the condensed consolidated financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities and equity and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. On an ongoing basis, the Company evaluates its estimates, including, but not limited to, those related to bad debts, returns reserve for expected cancellations, income and sales tax liabilities, stock-based compensation, and litigation and other contingencies. The Company bases its estimates on historical experience

The significant accounting policies used in preparation of these condensed consolidated financial statements are disclosed in our Annual Report on Form 10-K for the fiscal year ended March 31, 2019 filed with the SEC on May 21, 2019, and there have been no changes to the Company's significant accounting policies during the three months ended June 30, 2019 except for the accounting policies described below that were updated as a result of adopting Accounting Standards Update ("ASU") 2016-02, Leases. All amounts and disclosures set forth herein are in compliance with this standard.

Effective April 1, 2019, the Company adopted ASU No. 2016-02 (“ASU 2016-02”), Leases using the modified retrospective transition approach utilizing the effective date as the date of initial application. ASU 2016-02 establishes a new lease accounting model for leases, which requires lessees to recognize right-of-use assets and lease liabilities on the balance sheet, but lease expense will be recognized on the income statement in a manner similar to previous requirements. Prior years presented have not been adjusted for ASU 2016-02 and continue to be reported in accordance with our historical accounting policy.

The new standard provides a number of optional practical expedients in transition. The Company has elected the package of practical expedients permitted under the new lease standard, which among other things, allows the carryforward the historical lease classification. As a result, there was no impact to opening retained earnings. The new standard also provides a practical expedient for an entity’s ongoing accounting. The Company has elected such practical expedient to not separate lease and non-lease components for all leases. It also made an accounting policy election to not recognize right-of-use assets and lease liabilities on the balance sheet for leases with a term of 12 months or less and will recognize lease payments as an expense on a straight-line basis over the lease term.

The adoption of the new lease standard resulted in the recognition of right-of-use assets and lease liabilities of approximately $20.0 million and $21.4 million, respectively, for existing operating leases. The adoption of the new lease standard did not have a material impact on the Company's accumulated deficit as of April 1, 2019. For additional information on leases and the impact of the new lease standard, refer to Note 6.

In August 2018, the Financial Accounting Standards Board ("FASB") issued ASU 2018-13, Fair Value Measurement (Topic 820), which makes modifications to disclosure requirements on fair value measurements. The amendment is effective for public companies with fiscal years beginning after December 15, 2019. Early adoption is permitted. The Company is currently assessing the impact of this pronouncement to its condensed consolidated financial statements.

In August 2018, the FASB issued ASU 2018-15, Intangibles-Goodwill and Other-Internal Use Software (Subtopic 350-40), which reduces complexity for the accounting for costs of implementing a cloud computing service arrangement. The amendment is effective for public companies with fiscal years beginning after December 15, 2019. Early adoption is permitted. The Company is currently assessing the impact of this pronouncement to its condensed consolidated financial statements.