Document And Entity Information	6 Months Ended
	Aug. 02, 2014	Sep. 08, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	SIGMA DESIGNS INC
Document Type	10-Q
Current Fiscal Year End Date	--01-31
Entity Common Stock, Shares Outstanding		34,855,632
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. 02, 2014
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q2