SeaChange International, Inc. Quarterly report pursuant to Section 13 or 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	Jul. 31, 2016	Jan. 31, 2016
Available for sale marketable securities:
Marketable securities, short-term	$ 5,760	$ 1,504
Non-current marketable securities:
Marketable securities, long-term	6,271	10,764
Total	12,976	15,922
U.S. Treasury Notes and Bonds Conventional [Member]
Available for sale marketable securities:
Marketable securities, short-term	4,759	502
Non-current marketable securities:
Marketable securities, long-term	2,761	7,762
U.S. Government Agency Issues Short Term [Member]
Available for sale marketable securities:
Marketable securities, short-term	1,001	1,002
U.S. Government Agency Issues Long Term [Member]
Non-current marketable securities:
Marketable securities, long-term	3,510	3,002
Money Market Accounts [Member]
Financial assets:
Cash and cash equivalents	945	3,654
Fair Value, Inputs, Level 1 [Member]
Non-current marketable securities:
Total	8,465	11,918
Fair Value, Inputs, Level 1 [Member] \| U.S. Treasury Notes and Bonds Conventional [Member]
Available for sale marketable securities:
Marketable securities, short-term	4,759	502
Non-current marketable securities:
Marketable securities, long-term	2,761	7,762
Fair Value, Inputs, Level 1 [Member] \| Money Market Accounts [Member]
Financial assets:
Cash and cash equivalents	945	3,654
Fair Value, Inputs, Level 2 [Member]
Non-current marketable securities:
Total	4,511	4,004
Fair Value, Inputs, Level 2 [Member] \| U.S. Government Agency Issues Short Term [Member]
Available for sale marketable securities:
Marketable securities, short-term	1,001	1,002
Fair Value, Inputs, Level 2 [Member] \| U.S. Government Agency Issues Long Term [Member]
Non-current marketable securities:
Marketable securities, long-term	$ 3,510	$ 3,002