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Share-Based Compensation - Schedule of Share-Based Compensation Recognized in Consolidated Statements of Income and Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total share-based compensation expense	$ 12,545us-gaap_AllocatedShareBasedCompensationExpense	$ 13,640us-gaap_AllocatedShareBasedCompensationExpense	$ 31,572us-gaap_AllocatedShareBasedCompensationExpense	$ 27,432us-gaap_AllocatedShareBasedCompensationExpense
Molecular Diagnostic Testing Expense
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total share-based compensation expense	224us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = mygn_CostOfMolecularDiagnosticTestingMember	207us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = mygn_CostOfMolecularDiagnosticTestingMember	671us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = mygn_CostOfMolecularDiagnosticTestingMember	639us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = mygn_CostOfMolecularDiagnosticTestingMember
Pharmaceutical and Clinical Services Expense
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total share-based compensation expense	104us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = mygn_CostOfPharmaceuticalAndClinicalServicesMember	75us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = mygn_CostOfPharmaceuticalAndClinicalServicesMember	387us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = mygn_CostOfPharmaceuticalAndClinicalServicesMember	212us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = mygn_CostOfPharmaceuticalAndClinicalServicesMember
Research And Development Expense
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total share-based compensation expense	1,201us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember	3,042us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember	3,218us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember	4,670us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember
Selling, General, and Administrative Expenses
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total share-based compensation expense	$ 11,016us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember	$ 10,316us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember	$ 27,296us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember	$ 21,911us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

+ Details

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