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		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Segment Reporting Information [Line Items]
Total revenues	$ 23,430	$ 19,961	$ 57,322	$ 59,983
North America [Member]
Segment Reporting Information [Line Items]
Total revenues	6,931	9,116	23,577	28,306
Europe and Middle East [Member]
Segment Reporting Information [Line Items]
Total revenues	14,560	8,518	28,203	26,098
Latin America [Member]
Segment Reporting Information [Line Items]
Total revenues	1,545	1,334	4,408	3,785
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 394	$ 993	$ 1,134	$ 1,794
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	29.00%	45.00%	41.00%	47.00%
Customer Concentration Risk [Member] \| Total Revenues [Member] \| Europe and Middle East [Member]
Segment Reporting Information [Line Items]
% of total revenues	62.00%	43.00%	49.00%	44.00%
Customer Concentration Risk [Member] \| Total Revenues [Member] \| Latin America [Member]
Segment Reporting Information [Line Items]
% of total revenues	7.00%	7.00%	8.00%	6.00%
Customer Concentration Risk [Member] \| Total Revenues [Member] \| Asia Pacific [Member]
Segment Reporting Information [Line Items]
% of total revenues	2.00%	5.00%	2.00%	3.00%