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Basis of Presentation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended	9 Months Ended
	Jun. 30, 2014	Mar. 31, 2014
Trade Accounts Receivable
Organization and Summary of Significant Accounting Policies Disclosure [Line Items]
Prior period reclassification adjustment	$ 0.6us-gaap_PriorPeriodReclassificationAdjustment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_TradeAccountsReceivableMember
Foreign Exchange
Organization and Summary of Significant Accounting Policies Disclosure [Line Items]
Prior period reclassification adjustment		1.0us-gaap_PriorPeriodReclassificationAdjustment / us-gaap_TradingActivityByTypeAxis = us-gaap_ForeignExchangeMember
Maturities and Sales of Marketable Securities
Organization and Summary of Significant Accounting Policies Disclosure [Line Items]
Prior period reclassification adjustment		(1.0)us-gaap_PriorPeriodReclassificationAdjustment / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = mygn_MaturitiesAndSalesOfMarketableSecuritiesMember
Other Receivables
Organization and Summary of Significant Accounting Policies Disclosure [Line Items]
Prior period reclassification adjustment	$ (0.6)us-gaap_PriorPeriodReclassificationAdjustment / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = mygn_OtherReceivablesMember

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