Intangible Assets, Net (Details) (USD $)	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross carrying amount	$ 479,296,000	$ 419,398,000
Intangible Assets, Finite and Indefinite Lives, Gross	481,796,000	419,398,000
Intangible assets, Accumulated amortization	274,889,000	222,938,000
Intangible assets, net	206,907,000	196,460,000
Amortization of intangible assets	52,600,000	49,100,000	52,300,000
Asset Impairment Charges			3,400,000
Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross carrying amount	192,297,000	164,796,000
Intangible assets, Accumulated amortization	136,709,000	110,740,000
Intangible assets, Useful Life, Minimum, Years	2
Intangible assets, Useful Life, Maximum, Years	7
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross carrying amount	261,713,000	233,995,000
Intangible assets, Accumulated amortization	119,948,000	95,753,000
Intangible assets, Useful Life, Minimum, Years	4
Intangible assets, Useful Life, Maximum, Years	10
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross carrying amount	16,224,000	12,952,000
Intangible assets, Accumulated amortization	13,205,000	12,577,000
Intangible assets, Useful Life, Minimum, Years	3
Intangible assets, Useful Life, Maximum, Years	10
Non-Competition Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross carrying amount	5,779,000	5,215,000
Intangible assets, Accumulated amortization	3,656,000	2,760,000
Intangible assets, Useful Life, Minimum, Years	3
Intangible assets, Useful Life, Maximum, Years	10
Distribution Network [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross carrying amount	2,440,000	2,440,000
Intangible assets, Accumulated amortization	1,352,000	1,108,000
Intangible assets, Useful Life, Years	10
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross carrying amount	843,000	0
Intangible assets, Accumulated amortization	19,000	0
Intangible assets, Useful Life, Years	3
Comverse BSS [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	22,034,000	39,389,000
Verint System [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	184,873,000	157,071,000
In-Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)		0
Series of Individually Immaterial Business Acquisitions [Member] | In-Process Research and Development [Member] | Verint Segment [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Indefinite-lived Intangible Asset, Amount	$ 2,500,000