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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2018
Aug. 17, 2018
Dec. 31, 2017
Document and Entity Information      
Entity Registrant Name PREMIER, INC.    
Entity Central Index Key 0001577916    
Current Fiscal Year End Date --06-30    
Entity Filer Category Large Accelerated Filer    
Document Type 10-K    
Document Period End Date Jun. 30, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Well Known Seasoned Issuer Yes    
Entity Public Float     $ 1,518.1
Class A Common Stock      
Document and Entity Information      
Entity Common Stock, Shares Outstanding   53,271,621  
Class B Common Stock      
Document and Entity Information      
Entity Common Stock, Shares Outstanding   79,519,233