Goodwill (Changes In Carrying Amount Of Goodwill) (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 30, 2012		Jul. 31, 2012		Jan. 31, 2012
Goodwill [Roll Forward]
Goodwill, gross, at beginning of period			$ 1,202,378,000		$ 1,206,127,000
Accumulated impairment losses	(156,455,000)		(156,455,000)
Effect of changes in foreign currencies and other			(3,749,000)
Goodwill, net			1,045,923,000		1,049,672,000
Comverse BSS
Goodwill [Roll Forward]
Goodwill, gross, at beginning of period			83,920,000		83,955,000
Accumulated impairment losses	0		0
Effect of changes in foreign currencies and other			(35,000)
Goodwill, net			83,920,000		83,955,000
Comverse VAS
Goodwill [Roll Forward]
Goodwill, gross, at beginning of period			65,938,000		65,966,000
Accumulated impairment losses	0		0
Effect of changes in foreign currencies and other			(28,000)
Goodwill, net			65,938,000		65,966,000
Verint
Goodwill [Roll Forward]
Goodwill, gross, at beginning of period			890,473,000	[1]	894,155,000	[1]
Accumulated impairment losses	0	[1]	0	[1]
Effect of changes in foreign currencies and other			(3,682,000)	[1]
Goodwill, net			890,473,000	[1]	894,155,000	[1]
All Other
Goodwill [Roll Forward]
Goodwill, gross, at beginning of period			162,047,000	[2]	162,051,000	[2]
Accumulated impairment losses	(156,455,000)	[2]	(156,455,000)	[2]
Effect of changes in foreign currencies and other			(4,000)	[2]
Goodwill, net			5,592,000	[2]	5,596,000	[2]
Other Acquisitions | Verint
Goodwill [Roll Forward]
Reduction in goodwill due to identified adjustments	$ 2,900,000		$ 100,000		$ 2,900,000

[1] Goodwill balances of Verint as of January 31, 2012 have been retrospectively adjusted to reflect measurement period adjustments to the purchase price allocations for several business combinations completed during the fiscal year ended January 31, 2012. These adjustments were identified during the three months ended April 30, 2012, and resulted from new information obtained about facts and circumstances that existed as of the respective acquisition dates. These adjustments reduced goodwill by $2.9 million in the Verint segment (see Note 5, Business Combinations).

[2] The amount of goodwill in “All Other” is attributable to Comverse MI and Netcentrex. The goodwill associated with Netcentrex was impaired during the fiscal year ended January 31, 2009 and prior fiscal years.