Document and Entity Information - shares	6 Months Ended
	Jul. 31, 2018	Sep. 04, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jul. 31, 2018
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Trading Symbol	SEAC
Entity Registrant Name	SEACHANGE INTERNATIONAL INC
Entity Central Index Key	0001019671
Current Fiscal Year End Date	--01-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		35,749,131