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

Discontinued Operations - Additional Information (Detail) (USD $)	12 Months Ended		0 Months Ended	3 Months Ended
	Jan. 31, 2015	Jan. 31, 2013	May 04, 2012	Mar. 31, 2013	Apr. 30, 2012	May 21, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations, after tax		$ (14,073,000)
Goodwill, impairment loss	0us-gaap_GoodwillImpairmentLoss
Servers and Storage [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net cash received from sale of business			4,900,000
Income (loss) from discontinued operations, after tax			1,500,000
Media Services [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net cash received from sale of business						27,000,000
Income (loss) from discontinued operations, after tax				(15,500,000)
Goodwill, impairment loss					$ 17,000,000