Business Segment Information (Schedule of Total Revenue, Total Costs and Expenses, Segment Performance) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Oct. 31, 2012		Oct. 31, 2011		Oct. 31, 2012		Oct. 31, 2011
Segment Reporting Information [Line Items]
Total revenue	$ 201,520		$ 199,364		$ 610,581		$ 570,655
Total costs and expenses	194,807		200,183		580,855		575,857
Income (loss) from operations	6,713		(819)		29,726		(5,202)
Stock-based compensation expense	7,743		7,572		21,207		25,080
Interest expense	(7,818)		(7,909)		(23,240)		(24,571)
Depreciation and amortization	(14,274)		(13,676)		(42,665)		(39,348)
Other non-cash items	(2)	[1]	(44)	[1]	(539)	[1]	(266)	[1]
Verint
Segment Reporting Information [Line Items]
Total revenue	201,520		199,364		610,581		570,655
Total costs and expenses	184,749		181,082		546,564		512,129
Income (loss) from operations	16,771		18,282		64,017		58,526
Segment revenue adjustment	1,130		5,211		7,376		6,173
Stock-based compensation expense	6,685		6,650		18,318		20,841
Amortization of acquisition-related intangibles	9,805		9,368		29,466		25,664
Compliance-related professional fees			3		0		1,011
Strategic evaluation related costs	9,580		0		12,919		0
Litigation settlements and related costs			0				0
Acquisition-related charges			2,183				7,377
Other	2,001	[2]	2,329	[2]	(3,759)	[2]	4,335	[2]
Segment expense adjustments	28,071		20,533		56,944		59,228
Segment expenses	156,678		160,549		489,620		452,901
Segment performance	45,972		44,026		128,337		123,927
Interest expense	(7,698)		(7,905)		(23,283)		(24,556)
Depreciation and amortization	(14,211)		(13,613)		(42,476)		(39,152)
Other non-cash items	(2)	[1]	(44)	[1]	(539)	[1]	(266)	[1]
All Other
Segment Reporting Information [Line Items]
Total revenue	0		0		0		0
Total costs and expenses	10,058		19,101		34,291		63,728
Income (loss) from operations	(10,058)		(19,101)		(34,291)		(63,728)
Segment revenue adjustment	0		0		0		0
Stock-based compensation expense	1,058		922		2,889		4,239
Amortization of acquisition-related intangibles	0		0		0		0
Compliance-related professional fees			920		144		18,326
Strategic evaluation related costs	773		3,164		904		6,288
Litigation settlements and related costs			4,882				4,970
Acquisition-related charges			0				0
Other	1,414		(1)		1,414		17
Segment expense adjustments	3,245		9,887		5,351		33,840
Segment expenses	6,813		9,214		28,940		29,888
Segment performance	(6,813)		(9,214)		(28,940)		(29,888)
Interest expense	(120)		(4)		43		(15)
Depreciation and amortization	(63)		(63)		(189)		(196)
Other non-cash items	0	[1]	0	[1]	0	[1]	0	[1]
Segment Revenue | Verint
Segment Reporting Information [Line Items]
Revenue	202,650		204,575		617,957		576,828
Segment Revenue | All Other
Segment Reporting Information [Line Items]
Revenue	$ 0		$ 0		$ 0		$ 0

[1] Other non-cash items consist of write-downs of property and equipment.

[2] Consists of changes in the fair value of contingent consideration liabilities associated with business combinations.