v3.19.2
Cover Page - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2019
Aug. 20, 2019
Dec. 31, 2018
Cover page.      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jun. 30, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Registrant Name Presidio, Inc.    
Entity Central Index Key 0001631825    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Interactive Data Current Yes    
Current Fiscal Year End Date --06-30    
Entity Filer Category Accelerated Filer    
Entity Well-known Seasoned Issuer No    
Entity Public Float     $ 489.5
Entity Common Stock, Shares Outstanding   83,183,986  
Entity Shell Company false    
Entity Small Business false    
Entity Emerging Growth Company false    
Title of 12(b) Security Common Stock, par value $0.01 per share    
Trading Symbol PSDO    
Security Exchange Name NASDAQ    
Entity File Number 001-38028    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 47-2398593    
Entity Address, Address Line One One Penn Plaza, Suite 2832    
Entity Address, City or Town New York    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10119    
City Area Code 212    
Local Phone Number 652-5700    
Document Annual Report true    
Document Transition Report false