v3.5.0.2
Document and Entity Information Document - USD ($)
12 Months Ended
Jul. 31, 2016
Aug. 24, 2016
Jan. 29, 2016
Document Information [Abstract]      
Entity Registrant Name Palo Alto Networks Inc    
Entity Central Index Key 0001327567    
Document Type 10-K    
Document Period End Date Jul. 31, 2016    
Amendment Flag false    
Document Fiscal Year Focus 2016    
Document Fiscal Period Focus FY    
Document Fiscal Year End Date --07-31    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   90,850,457  
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 12,713,712,655