Basis of Presentation (Policies)	9 Months Ended
Mar. 31, 2020
Accounting Policies [Abstract]
Basis of Presentation	The accompanying condensed consolidated financial statements have been prepared by Myriad Genetics, Inc. (the “Company” or “Myriad”) 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”). The condensed consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. 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 for the fiscal year ended June 30, 2019, included in the Company’s Annual Report on Form 10-K for the fiscal year ended June 30, 2019. Operating results for the three and nine months ended March 31, 2020 may not necessarily be indicative of results to be expected for any other interim period or for the full year. The consolidated financial statements include the accounts of the Company’s majority-owned subsidiary, Assurex Canada, Ltd. which is 85% owned by Assurex Health, Inc. (“Assurex”), a wholly owned subsidiary of the Company, and 15% owned by the Centre for Addiction and Mental Health. Assurex Canada, Ltd. is a consolidated subsidiary of Assurex Health, Inc. The value of the non-controlling interest represents the portion of Assurex Canada, Ltd.’s profit or loss and net assets that is not held by Assurex Health, Inc. The Company attributes comprehensive income or loss of the subsidiary between the Company and the non-controlling interest based on the respective ownership interest. 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. Actual results could differ from those estimates.
Reclassification	Reclassifications Certain immaterial prior period goodwill impairment charges that were previously classified as part of selling, general and administrative expense in the condensed consolidated statements of operations were reclassified to conform to the current period presentation and are included as part of the goodwill and intangible asset impairment charges financial statement line item in the current period.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Recently Adopted Standards In February 2016, the Financial Accounting Standards Board (the “FASB”) issued ASU 2016-02, Leases (“ASU 2016-02”). ASU 2016-02 amends the existing accounting standards for lease accounting, including requiring lessees to recognize most leases on their balance sheets and changing certain lessor accounting requirements. ASU 2016-02 also requires entities to provide enhanced disclosures surrounding the amount, timing and uncertainty of cash flows arising from leasing arrangements. On July 1, 2019, the Company adopted ASU 2016-02 under the modified retrospective approach by initially applying ASU 2016-02 at the adoption date, rather than at the beginning of the earliest comparative period presented. Results for the three and nine months ended March 31, 2020 are presented under ASU 2016-02. Prior period amounts were not adjusted and continue to be reported under previous lease accounting guidance. Under ASU 2016-02, the Company determines if an arrangement is or contains a lease at inception by assessing whether the arrangement contains an identified asset and whether it has the right to control the identified asset. Right-of-use (“ROU”) assets represent the Company's right to use an underlying asset for the lease term and lease liabilities represent the Company's obligation to make lease payments arising from the lease. Lease liabilities are recognized at the lease commencement date based on the present value of future lease payments over the lease term. ROU assets are based on the measurement of the lease liability and also include any lease payments made prior to or on lease commencement and exclude lease incentives and initial direct costs incurred, as applicable. As the implicit rate in the Company's leases is generally unknown, the Company uses its incremental borrowing rate based on the information available at the lease commencement date in determining the present value of future lease payments. When calculating the Company’s incremental borrowing rates, the Company gives consideration to its credit risk, term of the lease, total lease payments and adjust for the impacts of collateral, as necessary. The lease term used may reflect any option to extend or terminate the lease when it is reasonably certain the Company will exercise such options. Lease expenses for the Company's operating leases are recognized on a straight-line basis over the lease term. ASU 2016-02 provides a number of optional practical expedients in transitioning to ASU 2016-02. The Company has elected the package of practical expedients to avoid reassessing under ASU 2016-02 prior conclusions about lease identification, lease classification and initial direct costs. The Company has also elected the practical expedient allowing the use of hindsight in determining the lease term and assessing impairment of right-of-use ROU assets based on all facts and circumstances through the effective date of the new standard. ASU 2016-02 also provides practical expedients for ongoing lease accounting. The Company has elected the recognition exemption for short-term leases for all leases that qualify. Under this exemption, the Company will not recognize ROU assets or lease liabilities for those leases that qualify as a short-term lease (leases with lease terms of 12 months or less), which includes not recognizing ROU assets or lease liabilities for existing short-term leases in transition. The Company also has elected the practical expedient to avoid separating lease and non-lease components for any of its leases within its existing classes of assets. As of the July 1, 2019 adoption date, the Company recognized operating lease liabilities of $78.8 and right-of-use assets related to operating leases totaling $74.5 as of the adoption date. These are presented as “Current maturities of operating lease liabilities” for a total of $13.1, “Noncurrent operating lease liabilities” for a total of $65.7, and “Operating lease right-of-use assets” for a total of $74.5 on the Company’s consolidated balance sheet. No adjustments to the beginning retained earnings balance were required. On October 1, 2019, the Company early adopted ASU 2017-04, Intangibles – Goodwill and Other (Topic 350) (“ASU 2017-04”) as permitted under the standard. The standard simplifies the accounting for goodwill impairment by requiring a goodwill impairment to be measured using a single step impairment model, whereby the impairment equals the difference between the carrying amount and the fair value of the specified reporting units as a whole. This eliminates the second step of the current impairment model that requires a company to first estimate the fair value of all assets in a reporting unit and measure impairments based on those fair values and a residual measurement approach. The standard also specifies that any loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. This ASU was adopted on a prospective basis with no material impact to the Company’s consolidated financial statements. Standards Effective in Future Years and Not Yet Adopted In June 2016, 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 will be 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 will also be recorded through an allowance for credit losses rather than as a reduction in the amortized cost basis of the securities. ASU 2016-13 is effective for fiscal years beginning after December 31, 2019, including interim periods within those years. Early application of the guidance is permitted for all entities for fiscal years beginning after December 15, 2018, including the interim periods within those fiscal years. Application of the amendments is through a cumulative-effect adjustment to retained earnings as of the effective date. The Company is currently evaluating the impact of ASU 2016-13 on its 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. This guidance is effective for public entities for fiscal years beginning after December 15, 2019, and for interim periods within those fiscal years, with early adoption permitted. The Company is currently evaluating the potential effects of this guidance on its consolidated financial statements.

Basis of Presentation (Policies)

9 Months Ended

Mar. 31, 2020

The accompanying condensed consolidated financial statements have been prepared by Myriad Genetics, Inc. (the “Company” or “Myriad”) 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”). The condensed consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. 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 for the fiscal year ended June 30, 2019, included in the Company’s Annual Report on Form 10-K for the fiscal year ended June 30, 2019. Operating results for the three and nine months ended March 31, 2020 may not necessarily be indicative of results to be expected for any other interim period or for the full year.

The consolidated financial statements include the accounts of the Company’s majority-owned subsidiary, Assurex Canada, Ltd. which is 85% owned by Assurex Health, Inc. (“Assurex”), a wholly owned subsidiary of the Company, and 15% owned by the Centre for Addiction and Mental Health. Assurex Canada, Ltd. is a consolidated subsidiary of Assurex Health, Inc. The value of the non-controlling interest represents the portion of Assurex Canada, Ltd.’s profit or loss and net assets that is not held by Assurex Health, Inc. The Company attributes comprehensive income or loss of the subsidiary between the Company and the non-controlling interest based on the respective ownership interest.

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. Actual results could differ from those estimates.

Reclassification

Reclassifications

Certain immaterial prior period goodwill impairment charges that were previously classified as part of selling, general and administrative expense in the condensed consolidated statements of operations were reclassified to conform to the current period presentation and are included as part of the goodwill and intangible asset impairment charges financial statement line item in the current period.

Recent Accounting Pronouncements

Recently Adopted Standards

In February 2016, the Financial Accounting Standards Board (the “FASB”) issued ASU 2016-02, Leases (“ASU 2016-02”). ASU 2016-02 amends the existing accounting standards for lease accounting, including requiring lessees to recognize most leases on their balance sheets and changing certain lessor accounting requirements. ASU 2016-02 also requires entities to provide enhanced disclosures surrounding the amount, timing and uncertainty of cash flows arising from leasing arrangements. On July 1, 2019, the Company adopted ASU 2016-02 under the modified retrospective approach by initially applying ASU 2016-02 at the adoption date, rather than at the beginning of the earliest comparative period presented. Results for the three and nine months ended March 31, 2020 are presented under ASU 2016-02. Prior period amounts were not adjusted and continue to be reported under previous lease accounting guidance.

Under ASU 2016-02, the Company determines if an arrangement is or contains a lease at inception by assessing whether the arrangement contains an identified asset and whether it has the right to control the identified asset. Right-of-use (“ROU”) assets represent the Company's right to use an underlying asset for the lease term and lease liabilities represent the Company's obligation to make lease payments arising from the lease. Lease liabilities are recognized at the lease commencement date based on the present value of future lease payments over the lease term. ROU assets are based on the measurement of the lease liability and also include any lease payments made prior to or on lease commencement and exclude lease incentives and initial direct costs incurred, as applicable.

As the implicit rate in the Company's leases is generally unknown, the Company uses its incremental borrowing rate based on the information available at the lease commencement date in determining the present value of future lease payments. When calculating the Company’s incremental borrowing rates, the Company gives consideration to its credit risk, term of the lease, total lease payments and adjust for the impacts of collateral, as necessary. The lease term used may reflect any option to extend or terminate the lease when it is reasonably certain the Company will exercise such options. Lease expenses for the Company's operating leases are recognized on a straight-line basis over the lease term.

ASU 2016-02 provides a number of optional practical expedients in transitioning to ASU 2016-02. The Company has elected the package of practical expedients to avoid reassessing under ASU 2016-02 prior conclusions about lease identification, lease classification and initial direct costs. The Company has also elected the practical expedient allowing the use of hindsight in

determining the lease term and assessing impairment of right-of-use ROU assets based on all facts and circumstances through the effective date of the new standard. ASU 2016-02 also provides practical expedients for ongoing lease accounting. The Company has elected the recognition exemption for short-term leases for all leases that qualify. Under this exemption, the Company will not recognize ROU assets or lease liabilities for those leases that qualify as a short-term lease (leases with lease terms of 12 months or less), which includes not recognizing ROU assets or lease liabilities for existing short-term leases in transition. The Company also has elected the practical expedient to avoid separating lease and non-lease components for any of its leases within its existing classes of assets.

As of the July 1, 2019 adoption date, the Company recognized operating lease liabilities of $78.8 and right-of-use assets related to operating leases totaling $74.5 as of the adoption date. These are presented as “Current maturities of operating lease liabilities” for a total of $13.1, “Noncurrent operating lease liabilities” for a total of $65.7, and “Operating lease right-of-use assets” for a total of $74.5 on the Company’s consolidated balance sheet. No adjustments to the beginning retained earnings balance were required.

On October 1, 2019, the Company early adopted ASU 2017-04, Intangibles – Goodwill and Other (Topic 350) (“ASU 2017-04”) as permitted under the standard. The standard simplifies the accounting for goodwill impairment by requiring a goodwill impairment to be measured using a single step impairment model, whereby the impairment equals the difference between the carrying amount and the fair value of the specified reporting units as a whole. This eliminates the second step of the current impairment model that requires a company to first estimate the fair value of all assets in a reporting unit and measure impairments based on those fair values and a residual measurement approach. The standard also specifies that any loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. This ASU was adopted on a prospective basis with no material impact to the Company’s consolidated financial statements.

Standards Effective in Future Years and Not Yet Adopted

In June 2016, 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 will be 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 will also be recorded through an allowance for credit losses rather than as a reduction in the amortized cost basis of the securities. ASU 2016-13 is effective for fiscal years beginning after December 31, 2019, including interim periods within those years. Early application of the guidance is permitted for all entities for fiscal years beginning after December 15, 2018, including the interim periods within those fiscal years. Application of the amendments is through a cumulative-effect adjustment to retained earnings as of the effective date. The Company is currently evaluating the impact of ASU 2016-13 on its 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. This guidance is effective for public entities for fiscal years beginning after December 15, 2019, and for interim periods within those fiscal years, with early adoption permitted. The Company is currently evaluating the potential effects of this guidance on its consolidated financial statements.