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Stockholders' Equity - Schedule of Stock Repurchases (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
Stockholders Equity [Line Items]
Common stock and additional paid-in-capital reductions	$ 15,212mygn_AmountOfReductionInCommonStockAsResultOfStockRepurchases	$ 12,384mygn_AmountOfReductionInCommonStockAsResultOfStockRepurchases	$ 40,172mygn_AmountOfReductionInCommonStockAsResultOfStockRepurchases	$ 67,420mygn_AmountOfReductionInCommonStockAsResultOfStockRepurchases
Charges to retained earnings	$ 46,782mygn_AmountChargedToRetainedEarningsAsResultOfStockRepurchases	$ 29,506mygn_AmountChargedToRetainedEarningsAsResultOfStockRepurchases	$ 125,774mygn_AmountChargedToRetainedEarningsAsResultOfStockRepurchases	$ 154,594mygn_AmountChargedToRetainedEarningsAsResultOfStockRepurchases
Common Stock
Stockholders Equity [Line Items]
Shares purchased and retired	1,779us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	1,554us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	4,729us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	8,545us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember

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- Definition

Amount Charged To Retained Earnings As A Result Of Stock Repurchases.

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- Definition

Amount Of Reduction In Common Stock As A Result Of Stock Repurchases

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- Definition

Number of shares that have been repurchased and retired during the period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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