Business Segment Information (Schedule of Total Assets by Segment) (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
CTI [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Net Assets	$ 1,428,651	$ 1,562,989	$ 1,396,781
Comverse [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Net Assets	850,106	1,016,625	1,282,707
Verint [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Net Assets	1,568,196	1,441,424	1,461,818
Starhome B.V. [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Net Assets	$ 43,009	$ 37,235	$ 27,677