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Share-Based Compensation - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 05, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSUs issuance as percentage of stock options granted	33.33%mygn_NumberOfRestrictedStockUnitsIssuanceAsPercentageOfStockOptionsGranted
Options to purchase shares vested and exercisable, shares		8,803,382us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber		8,803,382us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
Exercisable weighted average price of options		$ 22.64us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice		$ 22.64us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice
Total unrecognized share-based compensation cost related to stock options		$ 28,700,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions		$ 28,700,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
RSUs vested, Number of shares				0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Total unrecognized share-based compensation cost related to RSUs		31,300,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions		31,300,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
RSUs granted, Weighted average grant date fair value				$ 37.85us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Share based compensation expense		12,147,000us-gaap_AllocatedShareBasedCompensationExpense	6,857,000us-gaap_AllocatedShareBasedCompensationExpense	19,028,000us-gaap_AllocatedShareBasedCompensationExpense	13,792,000us-gaap_AllocatedShareBasedCompensationExpense
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period of share-based compensation vested, years	4 years
Total unrecognized share-based compensation cost, weighted-average period, years				2 years 11 months 23 days
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period of share-based compensation vested, years				4 years
Total unrecognized share-based compensation cost, weighted-average period, years				1 year 11 months 1 day
Stock options | Share-based compensation granted after December 5, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expire from date of grant, years				8 years
Stock options | Share-based compensation granted prior to December 5, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expire from date of grant, years				10 years
2012 Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares approved		2,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = mygn_EmployeeStockPurchasePlanTwentyTwelveMember		2,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = mygn_EmployeeStockPurchasePlanTwentyTwelveMember
Shares reserved for issuance exercise of options		1,666,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = mygn_EmployeeStockPurchasePlanTwentyTwelveMember		1,666,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = mygn_EmployeeStockPurchasePlanTwentyTwelveMember
Shares issued under the Plan				334,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_PlanNameAxis = mygn_EmployeeStockPurchasePlanTwentyTwelveMember
The 2010 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares approved						3,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = mygn_EmployeeDirectorAndConsultantEquityIncentivePlanMember
Shares reserved for issuance exercise of options		1,809,802us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = mygn_EmployeeDirectorAndConsultantEquityIncentivePlanMember		1,809,802us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = mygn_EmployeeDirectorAndConsultantEquityIncentivePlanMember
The 2010 Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grant				4,496,736us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_PlanNameAxis = mygn_EmployeeDirectorAndConsultantEquityIncentivePlanMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Chief Financial Officer [Member] | Resignation Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense		$ 3,100,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = mygn_ResignationAgreementMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefFinancialOfficerMember		$ 3,100,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = mygn_ResignationAgreementMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefFinancialOfficerMember

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- Definition

Number of Restricted Stock Units Issuance As Percentage of Stock Options Granted

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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.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Unrecognized cost of unvested options awarded to employees as compensation.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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Number of share instruments newly issued under a share-based compensation plan.

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