SeaChange International, Inc. Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Summary of Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Jan. 31, 2016	Jan. 31, 2015
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	$ 70,970	$ 104,285
Gross Unrealized Gains	32	43
Gross Unrealized Losses	(1)
Estimated Fair Value	71,001	104,328
Cash [Member]
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	55,079	88,444
Estimated Fair Value	55,079	88,444
Cash Equivalents [Member]
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	3,654	1,575
Estimated Fair Value	3,654	1,575
Cash and Cash Equivalents [Member]
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	58,733	90,019
Estimated Fair Value	58,733	90,019
U.S. Treasury Notes and Bonds - Short Term [Member]
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	503	1,500
Gross Unrealized Gains		1
Gross Unrealized Losses	(1)
Estimated Fair Value	502	1,501
U.S. Treasury Notes and Bonds - Long Term [Member]
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	7,756	4,268
Gross Unrealized Gains	6	18
Estimated Fair Value	7,762	4,286
U.S. Government Agency Issues Short Term [Member]
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	1,001	6,008
Gross Unrealized Gains	1	7
Estimated Fair Value	1,002	6,015
U.S. Government Agency Issues Long Term [Member]
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	2,977	2,490
Gross Unrealized Gains	25	17
Estimated Fair Value	$ 3,002	$ 2,507