Document and Entity Information	9 Months Ended
	Jan. 25, 2013	Feb. 19, 2013
Condensed Consolidated Balance Sheets [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jan. 25, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3
Entity Registrant Name	CYBERONICS INC
Entity Central Index Key	0000864683
Current Fiscal Year End Date	--04-26
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		27,635,851