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Stockholders' Equity - Schedule of Stock Repurchases (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Stockholders Equity [Line Items]        
Common stock and additional paid-in-capital reductions $ 14,765mygn_AmountOfReductionInCommonStockAsResultOfStockRepurchases $ 25,096mygn_AmountOfReductionInCommonStockAsResultOfStockRepurchases $ 24,960mygn_AmountOfReductionInCommonStockAsResultOfStockRepurchases $ 55,036mygn_AmountOfReductionInCommonStockAsResultOfStockRepurchases
Charges to retained earnings $ 43,559mygn_AmountChargedToRetainedEarningsAsResultOfStockRepurchases $ 52,713mygn_AmountChargedToRetainedEarningsAsResultOfStockRepurchases $ 78,992mygn_AmountChargedToRetainedEarningsAsResultOfStockRepurchases $ 125,088mygn_AmountChargedToRetainedEarningsAsResultOfStockRepurchases
Common Stock        
Stockholders Equity [Line Items]        
Shares purchased and retired 1,733us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 3,185us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 2,950us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 6,991us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember