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

Fair Value Measurements - Summary of Available-for-Sale Securities (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2013	Jan. 31, 2013
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	$ 125,464	$ 119,911
Gross Unrealized Gains	24	83
Gross Unrealized Losses
Estimated Fair Value	125,488	119,994
Cash [Member]
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	109,648	104,109
Gross Unrealized Gains
Gross Unrealized Losses
Estimated Fair Value	109,648	104,109
Cash Equivalents [Member]
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	4,459	2,612
Gross Unrealized Gains
Gross Unrealized Losses
Estimated Fair Value	4,459	2,612
Cash and Cash Equivalents [Member]
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	114,107	106,721
Gross Unrealized Gains
Gross Unrealized Losses
Estimated Fair Value	114,107	106,721
U.S. Government Agency Issues Short Term [Member]
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	3,019	6,043
Gross Unrealized Gains	2	61
Gross Unrealized Losses
Estimated Fair Value	3,021	6,104
U.S. Government Agency Issues Long Term [Member]
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	8,338	7,147
Gross Unrealized Gains	22	22
Gross Unrealized Losses
Estimated Fair Value	$ 8,360	$ 7,169