XML 12 R1.htm IDEA: XBRL DOCUMENT v3.3.1.900
Document and Entity Information - shares
9 Months Ended
Jan. 29, 2016
Feb. 17, 2016
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jan. 29, 2016  
Document Fiscal Year Focus 2016  
Document Fiscal Period Focus Q3  
Trading Symbol NTAP  
Entity Registrant Name NetApp, Inc.  
Entity Central Index Key 0001002047  
Current Fiscal Year End Date --04-29  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   289,082,898