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Quarterly Information (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Jan. 31, 2012
Oct. 31, 2011
Jul. 31, 2011
Apr. 30, 2011
Jan. 31, 2011
Oct. 31, 2010
Jul. 31, 2010
Apr. 30, 2010
Jan. 31, 2012
Jan. 31, 2011
Jan. 31, 2010
Selected Quarterly Financial Information [Abstract]                      
Revenue $ 405,455 $ 453,078 $ 386,367 $ 349,497 $ 430,837 $ 425,460 $ 410,242 $ 356,888 $ 1,594,397 $ 1,623,427 $ 1,533,937
(Loss) income from operations 16,267 32,130 12,062 (33,424) 23,525 23,302 (13,050) (83,692) 27,035 (49,915) (193,101)
Net (loss) income from continuing operations attributable to Comverse Technology         19,136 (40,929) (23,173) (80,651) (58,726) (125,617) (230,430)
Loss from discontinued operations, net of tax         (3,707) (774) (1,000) (1,224) 0 (6,705) (41,605)
Net (loss) income attributable to Comverse Technology 4,476 35,690 (39,697) (59,195) 15,429 (41,703) (24,173) (81,875) (58,726) (132,322) (272,035)
Net Income (Loss) Attributable to Comverse Technology, Diluted 4,350 35,652 (39,765) (59,197) 18,903 (42,956) (23,232) (80,651)      
Income (Loss) from Discontinued Operations, Net of Tax, Total, Diluted         $ (3,707) $ (774) $ (1,000) $ (1,224)      
Income (Loss) from Continuing Operations, Per Basic Share         $ 0.10 $ (0.20) $ (0.12) $ (0.39) $ (0.28) $ (0.61) $ (1.13)
Income (Loss) from Continuing Operations, Per Diluted Share         $ 0.09 $ (0.21) $ (0.12) $ (0.39) $ (0.28) $ (0.62) $ (1.13)
Loss per share from discontinued operations attributable to Comverse Technology, Inc., Basic         $ (0.02) $ 0.00 $ 0.00 $ (0.01) $ 0.00 $ (0.03) $ (0.20)
Loss per share from discontinued operations attributable to Comverse Technology, Inc., Diluted         $ (0.02) $ 0.00 $ 0.00 $ (0.01) $ 0.00 $ (0.03) $ (0.20)
(Loss) earnings per share attributable to Comverse Technology, Inc.'s shareholders - Basic $ 0.02 $ 0.17 $ (0.19) $ (0.29) $ 0.08 $ (0.20) $ (0.12) $ (0.40) $ (0.28) $ (0.64) $ (1.33)
(Loss) earnings per share attributable to Comverse Technology, Inc.’s shareholders - Diluted $ 0.02 $ 0.17 $ (0.19) $ (0.29) $ 0.07 $ (0.21) $ (0.12) $ (0.40) $ (0.28) $ (0.65) $ (1.33)