v2.4.0.8
Document and Entity Information (USD $)
12 Months Ended
Jun. 30, 2014
Aug. 01, 2014
Dec. 31, 2013
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jun. 30, 2014    
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY    
Trading Symbol MYGN    
Entity Registrant Name MYRIAD GENETICS INC    
Entity Central Index Key 0000899923    
Current Fiscal Year End Date --06-30    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   72,795,117  
Entity Public Float     $ 1,547,653,605