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Stockholders' Equity - Additional Information (Detail) (USD $)	Mar. 31, 2015	Feb. 28, 2015
Stockholders Equity Note [Line Items]
Additional share repurchase program, authorized amount		$ 200,000,000mygn_StockRepurchaseProgramIncreaseDecreaseInAuthorizedAmount
Cumulative share repurchase, authorized amount		1,200,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
Share repurchase program, remaining authorized repurchase amount	$ 199,700,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1

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- Definition

Stock repurchase program increase decrease in authorized amount.

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- Definition

Amount of stock repurchase plan authorized.

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No definition available.

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- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

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