Document and Entity Information - shares
3 Months Ended
Sep. 30, 2017
Oct. 31, 2017
Document and Entity Information    
Entity Registrant Name Presidio, Inc.  
Entity Central Index Key 0001631825  
Document Type 10-Q  
Document Period End Date Sep. 30, 2017  
Amendment Flag false  
Current Fiscal Year End Date --06-30  
Entity Filer Category Non-accelerated Filer  
Entity Common Stock, Shares Outstanding   91,672,682
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q1