Document And Entity Information	9 Months Ended
	Jan. 27, 2012	Feb. 21, 2012
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jan. 27, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q3
Entity Registrant Name	NetApp, Inc.
Entity Central Index Key	0001002047
Entity Filer Category	Large Accelerated Filer
Current Fiscal Year End Date	--04-27
Entity Common Stock, Shares Outstanding		362,990,179