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

Fair Value Measurements - Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail)

Fair Value Measurements - Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Jan. 31, 2016	Jan. 31, 2015
Available for sale marketable securities:
Marketable securities, short-term	$ 1,504	$ 7,516
Non-current marketable securities:
Marketable securities, long-term	10,764	6,793
Total	15,922	15,884
U.S. Treasury Notes and Bonds Conventional [Member]
Available for sale marketable securities:
Marketable securities, short-term	502	1,501
Non-current marketable securities:
Marketable securities, long-term	7,762	4,286
U.S. Government Agency Issues Short Term [Member]
Available for sale marketable securities:
Marketable securities, short-term	1,002	6,015
U.S. Government Agency Issues Long Term [Member]
Non-current marketable securities:
Marketable securities, long-term	3,002	2,507
Money Market Accounts [Member]
Financial assets:
Cash and cash equivalents	3,654	1,575
Fair Value, Inputs, Level 1 [Member]
Non-current marketable securities:
Total	11,918	7,362
Fair Value, Inputs, Level 1 [Member] \| U.S. Treasury Notes and Bonds Conventional [Member]
Available for sale marketable securities:
Marketable securities, short-term	502	1,501
Non-current marketable securities:
Marketable securities, long-term	7,762	4,286
Fair Value, Inputs, Level 1 [Member] \| Money Market Accounts [Member]
Financial assets:
Cash and cash equivalents	3,654	1,575
Fair Value, Inputs, Level 2 [Member]
Non-current marketable securities:
Total	4,004	8,522
Fair Value, Inputs, Level 2 [Member] \| U.S. Government Agency Issues Short Term [Member]
Available for sale marketable securities:
Marketable securities, short-term	1,002	6,015
Fair Value, Inputs, Level 2 [Member] \| U.S. Government Agency Issues Long Term [Member]
Non-current marketable securities:
Marketable securities, long-term	$ 3,002	$ 2,507