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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net income attributable to Myriad Genetics, Inc. stockholders	$ 21.8	$ 125.3	$ 80.2
Unrealized gain (loss) on available-for-sale securities, net of tax	(0.6)	0.3	(0.3)
Change in pension liability	0.2	(0.2)
Change in foreign currency translation adjustment	4.4	(2.6)	(5.2)
Comprehensive income	$ 25.8	$ 122.8	$ 74.7

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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