SeaChange International, Inc. Quarterly report pursuant to Section 13 or 15(d)

Segment Information, Significant Customers and Geographic Information - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area (Detail)

Segment Information, Significant Customers and Geographic Information - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Segment Reporting Information [Line Items]
Total revenues	$ 17,225	$ 18,452	$ 33,892	$ 40,022
North America [Member]
Segment Reporting Information [Line Items]
Total revenues	8,320	8,520	16,646	19,191
Europe and Middle East [Member]
Segment Reporting Information [Line Items]
Total revenues	6,478	8,439	13,643	17,580
Latin America [Member]
Segment Reporting Information [Line Items]
Total revenues	2,142	1,265	2,863	2,450
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 285	$ 228	$ 740	$ 801
Customer Concentration Risk [Member] \| Total Revenues [Member]
Segment Reporting Information [Line Items]
% of total revenues	10.00%	10.00%	10.00%	10.00%
Customer Concentration Risk [Member] \| Total Revenues [Member] \| North America [Member]
Segment Reporting Information [Line Items]
% of total revenues	48.00%	46.00%	49.00%	48.00%
Customer Concentration Risk [Member] \| Total Revenues [Member] \| Europe and Middle East [Member]
Segment Reporting Information [Line Items]
% of total revenues	38.00%	46.00%	40.00%	44.00%
Customer Concentration Risk [Member] \| Total Revenues [Member] \| Latin America [Member]
Segment Reporting Information [Line Items]
% of total revenues	12.00%	7.00%	9.00%	6.00%
Customer Concentration Risk [Member] \| Total Revenues [Member] \| Asia Pacific [Member]
Segment Reporting Information [Line Items]
% of total revenues	2.00%	1.00%	2.00%	2.00%