v3.6.0.2
Document and Entity Information Document - shares
6 Months Ended
Jan. 31, 2017
Feb. 16, 2017
Document Information [Abstract]    
Entity Registrant Name Palo Alto Networks Inc  
Entity Central Index Key 0001327567  
Document Type 10-Q  
Document Period End Date Jan. 31, 2017  
Amendment Flag false  
Document Fiscal Year Focus 2017  
Document Fiscal Period Focus Q2  
Document Fiscal Year End Date --07-31  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   92,036,258