Document and Entity Information
6 Months Ended
Jan. 31, 2015
Mar. 05, 2015
Document and Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jan. 31, 2015  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q2  
Trading Symbol ARUN  
Entity Registrant Name ARUBA NETWORKS, INC.  
Entity Central Index Key 0001173752  
Current Fiscal Year End Date --07-31  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   108,315,234