Document and Entity Information - shares
6 Months Ended
Dec. 31, 2018
Jan. 31, 2019
Document and Entity Information    
Entity Registrant Name Presidio, Inc.  
Entity Central Index Key 0001631825  
Document Type 10-Q  
Document Period End Date Dec. 31, 2018  
Amendment Flag false  
Current Fiscal Year End Date --06-30  
Entity Filer Category Accelerated Filer  
Entity Emerging Growth Company false  
Entity Small Business false  
Entity Common Stock, Shares Outstanding   82,518,278
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2