Document And Entity Information	6 Months Ended
	Aug. 03, 2013	Sep. 10, 2013
Document and Entity Information [Abstract]
Entity Registrant Name	SIGMA DESIGNS INC
Document Type	10-Q
Current Fiscal Year End Date	--02-02
Entity Common Stock, Shares Outstanding		34,567,958
Amendment Flag	false
Entity Central Index Key	0000790715
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Well-known Seasoned Issuer	No
Document Period End Date	Aug. 03, 2013
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q2