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Business Segment Information (Supplemental Financial Information) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Apr. 30, 2012
Apr. 30, 2011
Segment Reporting Information [Line Items]    
Revenue $ 343,667 $ 349,497
Intercompany revenue 0 0
Total revenue 343,667 349,497
Total costs and expenses 361,095 382,921
Income (loss) from operations (17,428) (33,424)
Stock-based compensation expense 8,146 11,077
Restructuring and integration charges 680 11,087
Interest expense (7,920) (9,128)
Depreciation and amortization 22,358 21,675
Other non-cash items (628) [1] (331) [1]
Comverse BSS [Member]
    
Segment Reporting Information [Line Items]    
Revenue 57,680 75,201
Intercompany revenue 0 0
Total revenue 57,680 75,201
Total costs and expenses 53,283 70,142
Income (loss) from operations 4,397 5,059
Stock-based compensation expense 0 0
Amortization of acquisition-related intangibles 4,074 4,498
Compliance-related professional fees 0 0
Compliance-related compensation and other expenses 630 2,062
Impairment of property and equipment 0 0
Litigation settlements and related costs 0 0
Restructuring and integration charges 0 0
Other 0 0
Interest expense 0 0
Depreciation and amortization 4,863 5,466
Other non-cash items 0 [1] 0 [1]
Comverse VAS [Member]
    
Segment Reporting Information [Line Items]    
Revenue 65,922 79,475
Intercompany revenue 0 0
Total revenue 65,922 79,475
Total costs and expenses 50,082 58,689
Income (loss) from operations 15,840 20,786
Stock-based compensation expense 0 0
Amortization of acquisition-related intangibles 0 0
Compliance-related professional fees 0 0
Compliance-related compensation and other expenses 773 1,201
Impairment of property and equipment 0 0
Litigation settlements and related costs 0 0
Restructuring and integration charges 0 0
Other 0 0
Interest expense 0 0
Depreciation and amortization 1,201 936
Other non-cash items 0 [1] 0 [1]
Comverse Performance [Member]
    
Segment Reporting Information [Line Items]    
Revenue 136,405 163,160
Intercompany revenue 1,345 604
Total revenue 137,750 163,764
Total costs and expenses 160,633 201,439
Income (loss) from operations (22,883) (37,675)
Stock-based compensation expense 1,431 668
Amortization of acquisition-related intangibles 4,074 4,498
Compliance-related professional fees (136) 12,609
Compliance-related compensation and other expenses 1,118 2,033
Impairment of property and equipment 22 128
Litigation settlements and related costs (230) 475
Restructuring and integration charges 680 11,087
Other (173) (27)
Expense adjustments 6,786 31,471
Expenses after adjustments 153,847 169,968
Comverse performance (16,097) (6,204)
Interest expense 196 330
Depreciation and amortization 8,045 8,499
Other non-cash items (22) [1] (128) [1]
Comverse Performance [Member] | Comverse BSS [Member]
    
Segment Reporting Information [Line Items]    
Revenue 57,680 75,201
Intercompany revenue 0 0
Total revenue 57,680 75,201
Total costs and expenses 53,283 70,142
Income (loss) from operations 4,397 5,059
Stock-based compensation expense 0 0
Amortization of acquisition-related intangibles 4,074 4,498
Compliance-related professional fees 0 0
Compliance-related compensation and other expenses 630 2,062
Impairment of property and equipment 0 0
Litigation settlements and related costs 0 0
Restructuring and integration charges 0 0
Other 0 0
Expense adjustments 4,704 6,560
Interest expense 0 0
Depreciation and amortization 4,863 5,466
Other non-cash items 0 [1] 0 [1]
Comverse Performance [Member] | Comverse VAS [Member]
    
Segment Reporting Information [Line Items]    
Revenue 65,922 79,475
Intercompany revenue 0 0
Total revenue 65,922 79,475
Total costs and expenses 50,082 58,689
Income (loss) from operations 15,840 20,786
Stock-based compensation expense 0 0
Amortization of acquisition-related intangibles 0 0
Compliance-related professional fees 0 0
Compliance-related compensation and other expenses 773 1,201
Impairment of property and equipment 0 0
Litigation settlements and related costs 0 0
Restructuring and integration charges 0 0
Other 0 0
Expense adjustments 773 1,201
Interest expense 0 0
Depreciation and amortization 1,201 936
Other non-cash items 0 [1] 0 [1]
Comverse Performance [Member] | Comverse Other [Member]
    
Segment Reporting Information [Line Items]    
Revenue 12,803 8,484
Intercompany revenue 1,345 604
Total revenue 14,148 9,088
Total costs and expenses 57,268 72,608
Income (loss) from operations (43,120) (63,520)
Stock-based compensation expense 1,431 668
Amortization of acquisition-related intangibles 0 0
Compliance-related professional fees (136) 12,609
Compliance-related compensation and other expenses (285) (1,230)
Impairment of property and equipment 22 128
Litigation settlements and related costs (230) 475
Restructuring and integration charges 680 11,087
Other (173) (27)
Expense adjustments 1,309 23,710
Interest expense 196 330
Depreciation and amortization 1,981 2,097
Other non-cash items $ (22) [1] $ (128) [1]
[1] Other non-cash items consist of write-downs of property and equipment.