Basis of Presentation	3 Months Ended
Basis of Presentation	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	BASIS OF PRESENTATION The accompanying condensed consolidated financial statements for Myriad Genetics, Inc. and subsidiaries (the “Company” or “Myriad”) have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and pursuant to the applicable rules and regulations of the Securities and Exchange Commission (“SEC”). All intercompany accounts and transactions have been eliminated in consolidation. In the opinion of management, the accompanying financial statements contain all adjustments (consisting of normal and recurring accruals) necessary to present fairly all financial statements in accordance with GAAP. The condensed consolidated financial statements herein should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended June 30, 2020. The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements, as well as the reported amounts of revenue and expenses during the reporting period. Operating results for the three months ended September 30, 2020 may not necessarily be indicative of results to be expected for any other interim period or for the full year. The full impact of the COVID-19 outbreak continues to evolve and its future impact remains highly uncertain and unpredictable. As such, it is uncertain as to the full magnitude of the effect that the pandemic will have on the Company's financial condition, liquidity, and future results of operations. Management is actively monitoring the impact of the global situation on the Company's financial condition, liquidity, operations, suppliers, industry, and workforce. Given the daily evaluation of the COVID-19 outbreak and the global responses to curb its spread, the Company is not able to estimate the effects of the COVID-19 outbreak on its results of operations, financial condition, or liquidity for future periods. We have historically experienced seasonality in our testing business. The volume of testing is negatively impacted by the summer season, which is generally reflected in the quarter ended June 30. The quarter ending December 31 is generally strong as we see an increase in volumes from patients who have met their annual insurance deductible. Conversely, the quarter ending March 31 is typically negatively impacted by the annual reset of patient deductibles. Due to the global pandemic, we cannot predict if seasonality will follow the same pattern as in prior years. Reclassifications Certain prior period amounts have been reclassified to conform with the current period presentation. The reclassifications have no impact on the total assets, total liabilities, stockholders’ equity, cash flows from operations, or net loss for the period. Recent Accounting Pronouncements Recently Adopted Standards In June 2016, the Financial Accounting Standards Board (the "FASB") issued ASU 2016-13, Financial Instruments – Credit Losses (Topic 326) (“ASU 2016-13”) which introduces new guidance for the accounting for credit losses on certain instruments within its scope. ASU 2016-13 introduces an approach based on expected losses to estimate credit losses on certain types of financial instruments. For trade receivables, the Company is required to use a forward-looking expected loss model rather than the incurred loss model for recognizing credit losses, which reflects losses that are probable. Credit losses relating to available-for-sale debt securities are also recorded through an allowance for credit losses rather than as a reduction in the amortized cost basis of the securities. On July 1, 2020, the Company adopted ASU 2016-13 under the modified retrospective approach by initially applying ASU 2016-13 at the adoption date, rather than at the beginning of the earliest comparative period presented. This guidance was adopted with no material impact to the Company's consolidated financial statements. In August 2018, the FASB issued ASU 2018-15, Intangibles – Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (“ASU 2018-15”). ASU 2018-15 aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software, including hosting arrangements that include an internal-use software license. On July 1, 2020, the Company adopted ASU 2018-15 on a prospective basis with no material impact to the Company's consolidated financial statements as of September 30, 2020. The amounts capitalized may be material in future periods; implementation costs incurred in cloud computing arrangements are capitalized as part of the other assets financial statement line item in the consolidated balance sheets. Standards Effective in Future Years and Not Yet Adopted In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes ("ASU 2019-12"). ASC 2019-12 is a new accounting standard to simplify accounting for income taxes and remove, modify, and add to the disclosure requirements of income taxes. The standard is effective for fiscal years beginning after December 15, 2020, with early adoption permitted. The Company is currently evaluating the impact this new standard will have on the consolidated financial statements.