Loss Per Share Attributable To Comverse Technology, Inc.'s Shareholders (Schedule Of Calculation Of Loss Per Share) (Details) (USD $) In Thousands, except Share data	3 Months Ended	6 Months Ended
Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2011	Jul. 31, 2010
Loss Per Share Attributable To Comverse Technology, Inc.'s Shareholders
Net loss from continuing operations attributable to Comverse Technology, Inc. - basic	$ (39,697)	$ (23,173)	$ (98,892)	$ (103,824)
Adjustment for subsidiary stock options	(68)	(59)	(51)
Net loss from continuing operations attributable to Comverse Technology, Inc. - diluted	(39,765)	(23,232)	(98,943)	(103,824)
Net loss from discontinued operations, attributable to Comverse Technology, Inc. - basic and diluted		$ (1,000)		$ (2,224)
Basic and diluted weighted average common shares outstanding	206,079,868	205,248,892	205,892,853	205,068,754
Basic and diluted Loss per share from continuing operations attributable to Comverse Technology, Inc.	$ (0.19)	$ (0.12)	$ (0.48)	$ (0.51)
Basic and diluted Loss per share from discontinued operations attributable to Comverse Technology, Inc.		$ 0.00		$ (0.01)
Basic and diluted loss per share	$ (0.19)	$ (0.12)	$ (0.48)	$ (0.52)
Contingently issuable shares excluded from computation of diluted earnings per share	600,000	600,000	800,000	800,000

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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