Business Combinations (Details) (USD $)					0 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2011	Jan. 31, 2011	Mar. 31, 2011 Verint Segment [Member] Maximum [Member] Other Business Combinations [Member]	Dec. 31, 2010 Verint Segment [Member] Maximum [Member] Other Business Combinations [Member]	Feb. 04, 2010 Verint Segment [Member] Iontas Acquisition [Member]	Jul. 31, 2011 Verint Segment [Member] Iontas Acquisition [Member]	Apr. 30, 2011 Verint Segment [Member] Iontas Acquisition [Member]	Jul. 31, 2011 Verint Segment [Member] Iontas Acquisition [Member]	Jul. 31, 2011 Verint Segment [Member] Other Business Combinations [Member]	Jul. 31, 2010 Iontas Acquisition [Member]
Total consideration			$ 20,000,000	$ 20,000,000	$ 21,700,000
Cash consideration					17,700,000
Maximum additional milestone-based contingent payments					3,800,000
Transaction costs directly related to acquisition										1,300,000
Contingent payments tied to certain performance targets period of achievement, in years					2
Estimated fair value of the contingent consideration	2,364,000	3,686,000			3,200,000	1,700,000		1,700,000
Contingent consideration paid to former shareholders							2,000,000
Changes in the fair value of contingent consideration recorded within selling, general and administrative expenses						$ 100,000		$ 200,000	$ 1,900,000