Business Combinations (Narrative) (Details) (USD $)	9 Months Ended			12 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended		3 Months Ended	9 Months Ended			3 Months Ended			9 Months Ended		12 Months Ended			9 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Jan. 31, 2012	Jan. 31, 2012 Verint acquisition	Oct. 31, 2012 Verint Vovici Acquisition	Oct. 31, 2011 Verint Vovici Acquisition	Oct. 31, 2012 Verint Vovici Acquisition	Oct. 31, 2011 Verint Vovici Acquisition	Jan. 31, 2012 Verint Vovici Acquisition	Aug. 04, 2011 Verint Vovici Acquisition	Oct. 31, 2012 Verint Global Management Technologies Acquisition	Oct. 31, 2012 Verint Global Management Technologies Acquisition	Oct. 31, 2011 Verint Global Management Technologies Acquisition	Oct. 07, 2011 Verint Global Management Technologies Acquisition	Oct. 31, 2012 Verint Other Acquisitions	Apr. 30, 2012 Verint Other Acquisitions	Oct. 31, 2011 Verint Other Acquisitions	Oct. 31, 2012 Verint Other Acquisitions	Oct. 31, 2011 Verint Other Acquisitions	Jan. 31, 2012 Verint Other Acquisitions	Jan. 31, 2012 Verint Other Acquisitions Developed Technology Rights	Jan. 31, 2012 Verint Other Acquisitions Customer Relationships	Oct. 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	23,316,000		38,646,000		4,300,000		4,300,000		9,900,000	9,900,000	3,800,000	3,800,000		12,000,000	15,200,000			15,200,000		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					800,000	300,000	2,900,000				1,300,000	5,800,000			400,000			200,000
Payments of contingent consideration to respective former shareholders or asset owners	6,074,000	2,004,000													1,000,000			5,200,000	0
Changes in fair value of contingent consideration recorded within selling, general and administrative expenses																			1,900,000				200,000
Transaction and related costs to acquisitions						1,300,000	500,000	2,500,000				300,000	1,000,000		100,000		600,000	600,000	3,000,000
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																		16,600,000
Goodwill being assessed for tax deductibility															6,500,000			6,500,000		21,400,000
Goodwill not deductible for tax purposes																		10,100,000
Current liabilities																				4,000,000
Noncurrent liabilities																				4,700,000
Liability for pre-acquisition business activities															3,100,000			3,100,000
Liability for pre-acquisition uncertain tax positions															2,900,000			2,900,000
Decrease in liability for uncertain tax positions resulting from settlements with taxing authorities															1,100,000			1,100,000
Write-off of indemnification asset due to resolution of uncertain tax positions																		1,100,000
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
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