Business Combinations (Schedule Of Unaudited Pro Forma Total Revenue And Net Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2011	Oct. 31, 2010
Business Combinations [Abstract]
Total revenue	$ 457,076	$ 431,737	$ 1,206,577	$ 1,206,022
Net income (loss) attributable to Comverse Technology Inc.	$ 36,746	$ (42,268)	$ (62,891)	$ (151,665)

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=6909870&loc=d3e1392-128463

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration