Document and Entity Information	3 Months Ended
	Sep. 30, 2012	Nov. 01, 2012
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2012
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q1
Trading Symbol	MYGN
Entity Registrant Name	MYRIAD GENETICS INC
Entity Central Index Key	0000899923
Current Fiscal Year End Date	--06-30
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		81,403,041