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Subsequent Events - Additional Information (Detail) - Assurex Health - USD ($)
$ in Millions
 12 Months Ended
Aug. 03, 2016
Jun. 30, 2016
Subsequent Event [Line Items]    
Business acquisition, description   The Merger Agreement contains certain termination rights for Myriad and Assurex, including the right by either party to terminate the Merger Agreement if the Merger has not occurred within two months of the signing of the Merger Agreement. The Closing is expected to occur before the end of the first quarter of Myriad’s fiscal year 2017, and is subject to customary closing conditions and regulatory approval including, among others, antitrust clearance under the Hart-Scott-Rodino Antitrust Improvements Act of 1976. Myriad intends to fund the transaction through cash on hand and possibly short-term debt. The acquisition is not subject to a financing contingency. The Merger Agreement was approved by the Board of Directors of both Myriad and Assurex, and is conditioned on receiving the requisite stockholder approval of the Assurex stockholders.
Subsequent Event    
Subsequent Event [Line Items]    
Aggregate cash purchase price $ 225  
Additional payments upon completion of performance-based milestones $ 185