XML 41 R70.htm IDEA: XBRL DOCUMENT
v3.20.1

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Jun. 30, 2020
Income Tax Contingency [Line Items] |  |  |  |  |
Income tax expense (benefit) | $ (15.9) | $ (3.6) | $ (20.7) | $ (1.0) |
Approximate rate on pre-tax income | 12.10% | 109.10% |  |  |
State Tax Authority [Member] | Earliest Tax Year [Member] | State of New Jersey [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax year being audited in income tax examination |  |  | 2013 |  |
State Tax Authority [Member] | Earliest Tax Year [Member] | State of New York [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax year being audited in income tax examination |  |  | 2014 |  |
State Tax Authority [Member] | Earliest Tax Year [Member] | State of Massachusetts [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax year being audited in income tax examination |  |  | 2014 |  |
State Tax Authority [Member] | Latest Tax Year [Member] | State of New Jersey [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax year being audited in income tax examination |  |  | 2017 |  |
State Tax Authority [Member] | Latest Tax Year [Member] | State of New York [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax year being audited in income tax examination |  |  | 2016 |  |
State Tax Authority [Member] | Latest Tax Year [Member] | State of Massachusetts [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax year being audited in income tax examination |  |  | 2016 |  |
Foreign Tax Authority [Member] | Earliest Tax Year [Member] | Federal Ministry of Finance, Germany [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax year being audited in income tax examination |  |  | 2013 |  |
Foreign Tax Authority [Member] | Earliest Tax Year [Member] | Switzerland Federal Tax Administration [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax year being audited in income tax examination |  |  | 2015 |  |
Foreign Tax Authority [Member] | Latest Tax Year [Member] | Federal Ministry of Finance, Germany [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax year being audited in income tax examination |  |  | 2015 |  |
Foreign Tax Authority [Member] | Latest Tax Year [Member] | Switzerland Federal Tax Administration [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax year being audited in income tax examination |  |  | 2016 |  |
Scenario Forecast [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
U.S. federal statutory rate |  |  |  |  | 21.00%

X
- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
Name: | us-gaap_EffectiveIncomeTaxRateContinuingOperations
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
Name: | us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_IncomeTaxContingencyLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tax year being audited in the income tax examination, in CCYY format. + References No definition available. + Details
Name: | us-gaap_IncomeTaxExaminationYearUnderExamination
Namespace Prefix: | us-gaap_
Data Type: | us-types:gYearListItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
Name: | us-gaap_IncomeTaxExpenseBenefit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_StateAndLocalJurisdictionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxPeriodAxis=us-gaap_EarliestTaxYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_NewJerseyDivisionOfTaxationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_NewYorkStateDivisionOfTaxationAndFinanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityNameAxis=mygn_MassachusettsDepartmentOfRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxPeriodAxis=us-gaap_LatestTaxYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_ForeignCountryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_FederalMinistryOfFinanceGermanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_SwissFederalTaxAdministrationFTAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |