Document and Entity Information - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2018
Aug. 31, 2018
Dec. 29, 2017
Document and Entity Information      
Entity Registrant Name Presidio, Inc.    
Entity Central Index Key 0001631825    
Document Type 10-K    
Document Period End Date Jun. 30, 2018    
Amendment Flag false    
Current Fiscal Year End Date --06-30    
Entity Filer Category Accelerated Filer    
Entity Common Stock, Shares Outstanding   92,953,627  
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 637.2