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Share-Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		1 Months Ended	6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Sep. 30, 2014	Mar. 31, 2015	Dec. 05, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options to purchase shares vested and exercisable, shares	8,935,850us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber		8,935,850us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber			8,935,850us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
Exercisable weighted average price of options	$ 22.55us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice		$ 22.55us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice			22.55us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice
Total unrecognized share-based compensation cost related to stock options	$ 24,400,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions		$ 24,400,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions			24,400,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
Total unrecognized share-based compensation cost related to RSUs	28,700,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions		28,700,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions			28,700,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
RSUs outstanding at at end of period, Weighted average grant date fair value	$ 37.68us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue		$ 37.68us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue			37.68us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Share based compensation expense	12,545,000us-gaap_AllocatedShareBasedCompensationExpense	13,640,000us-gaap_AllocatedShareBasedCompensationExpense	31,572,000us-gaap_AllocatedShareBasedCompensationExpense	27,432,000us-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 9 months 7 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 10 months 2 days
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			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			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	1,801,462us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = mygn_EmployeeDirectorAndConsultantEquityIncentivePlanMember		1,801,462us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = mygn_EmployeeDirectorAndConsultantEquityIncentivePlanMember			1,801,462us-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						4,400,795us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_PlanNameAxis = mygn_EmployeeDirectorAndConsultantEquityIncentivePlanMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Chief Financial Officer [Member] | Resignation Agreement In February Two Thousand Fifteen [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense	5,200,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = mygn_ResignationAgreementInFebruaryTwoThousandFifteenMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefFinancialOfficerMember		5,200,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = mygn_ResignationAgreementInFebruaryTwoThousandFifteenMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefFinancialOfficerMember
Chief Financial Officer [Member] | Resignation Agreement In October Two Thousand Fourteen [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_ResignationAgreementInOctoberTwoThousandFourteenMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefFinancialOfficerMember

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- 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.

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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 of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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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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