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Document and Entity Information - shares
6 Months Ended
Oct. 27, 2017
Nov. 15, 2017
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Oct. 27, 2017  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q2  
Trading Symbol NTAP  
Entity Registrant Name NetApp, Inc.  
Entity Central Index Key 0001002047  
Current Fiscal Year End Date --04-27  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   266,791,791