Business Combinations (Narrative) (Details) (USD $)	6 Months Ended			12 Months Ended	3 Months Ended	6 Months Ended				3 Months Ended	6 Months Ended			3 Months Ended		6 Months Ended		12 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jan. 31, 2012	Jan. 31, 2012 Verint acquisition	Jul. 31, 2012 Verint Vovici Acquisition	Jul. 31, 2012 Verint Vovici Acquisition	Jul. 31, 2011 Verint Vovici Acquisition	Jan. 31, 2012 Verint Vovici Acquisition	Aug. 04, 2011 Verint Vovici Acquisition	Jul. 31, 2012 Verint Global Management Technologies Acquisition	Jul. 31, 2012 Verint Global Management Technologies Acquisition	Jul. 31, 2011 Verint Global Management Technologies Acquisition	Oct. 07, 2011 Verint Global Management Technologies Acquisition	Jul. 31, 2012 Verint Other Acquisitions	Apr. 30, 2012 Verint Other Acquisitions	Jul. 31, 2012 Verint Other Acquisitions	Jul. 31, 2011 Verint Other Acquisitions	Jan. 31, 2012 Verint Other Acquisitions	Jul. 31, 2012 Verint Other Acquisitions Developed Technology Rights	Jul. 31, 2012 Verint Other Acquisitions Customer Relationships	Jul. 31, 2011 Verint Iontas Acquisition	Jul. 31, 2011 Verint Iontas Acquisition	Jan. 31, 2012 Verint Iontas Acquisition
Business Acquisition [Line Items]
Cash consideration								$ 55,708,000	$ 66,100,000				$ 36,600,000					$ 33,835,000
Fair value of contingent consideration	(25,204,000)		(38,646,000)		(3,500,000)	(3,500,000)		9,900,000	(9,900,000)	(5,100,000)	(5,100,000)		(12,000,000)	(16,600,000)		(16,600,000)		20,504,000					(1,700,000)
Potential additional contingent payments									19,100,000				17,400,000					41,000,000
Recorded benefit from change in fair value of contingent consideration					4,000,000	3,700,000				900,000	4,500,000			300,000		600,000
Payments of contingent consideration to respective former shareholders or asset owners	5,140,000	2,004,000												4,200,000	0
Changes in fair value of contingent consideration recorded within selling, general and administrative expenses																	1,900,000				100,000	200,000
Transaction and related costs to acquisitions						200,000	1,300,000				300,000	100,000		300,000		600,000	1,500,000
Total consideration for additional business combinations								66,103,000										55,155,000
Number of additional businesses acquired				5
Number of acquisitions of assets transactions qualifying as business combinations				2
Change in goodwill due to fluctuations in foreign currency exchange rates																16,500,000
Goodwill being assessed for tax deductibility														6,400,000		6,400,000		21,400,000
Goodwill not deductible for tax purposes																10,100,000
Current liabilities														3,200,000		3,200,000		4,000,000
Noncurrent liabilities														3,900,000		3,900,000		4,700,000
Liabilities assumed, value adjustment						200,000
Decrease in fair value of intangible assets																			300,000	400,000
Decrease in fair value of deferred income tax liabilities																3,800,000
Goodwill, purchase price allocation adjustment related to intangible assets																3,100,000
Goodwill, purchase price allocation adjustments, total															2,900,000	100,000		2,900,000
Purchase price allocation adjustment for intangible assets net																		600,000
Purchase price allocation adjustment for accounts payable and accrued expenses																		200,000
Purchase price allocation adjustment for long-term deferred income tax liabilities																		3,100,000
Purchase price allocation adjustment for long-term deferred tax assets																		$ 200,000