Business Combinations (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended				9 Months Ended	3 Months Ended		9 Months Ended			3 Months Ended	9 Months Ended						9 Months Ended	0 Months Ended	3 Months Ended	9 Months Ended							9 Months Ended
	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2011	Oct. 31, 2010	Aug. 02, 2011	Jan. 31, 2011	Oct. 31, 2011 GMT [Member]	Oct. 31, 2011 Vovici [Member]	Oct. 31, 2011 Vovici [Member]	Oct. 31, 2011 Vovici [Member]	Oct. 31, 2011 Other Acquisitions [Member]	Oct. 31, 2011 Iontas Acquisition [Member]	Oct. 31, 2011 Other Business Combinations [Member]	Oct. 31, 2011 Other Business Combinations [Member]	Oct. 31, 2011 Iontas Limited [Member]	Oct. 31, 2011 Verint [Member]	Aug. 04, 2011 Verint [Member]	Oct. 31, 2010 Verint [Member]	Oct. 31, 2011 Verint [Member] GMT [Member]	Oct. 31, 2011 Verint [Member] Vovici [Member]	Feb. 04, 2010 Verint [Member] Iontas Acquisition [Member]	Apr. 30, 2011 Verint [Member] Iontas Acquisition [Member]	Oct. 31, 2011 Verint [Member] Iontas Acquisition [Member]	Oct. 31, 2011 Verint [Member] Other Business Combinations [Member]	Oct. 31, 2010 Verint [Member] Iontas Limited [Member]	Oct. 31, 2011 Verint [Member] Compensation for pre-acquisition services [Member]	Oct. 31, 2011 Verint [Member] Stock based compensation expense [Member]	Dec. 31, 2010 Verint [Member] Maximum [Member] Other Business Combinations [Member]	Oct. 31, 2011 All Other [Member] Other Business Combinations [Member]	Oct. 31, 2011 GMT [Member]	Oct. 31, 2011 Developed Technology [Member] GMT [Member]	Oct. 31, 2011 Developed Technology [Member] Vovici [Member]	Oct. 31, 2011 Developed Technology [Member] Other Acquisitions [Member]	Oct. 31, 2011 Developed Technology [Member] Iontas Limited [Member]	Oct. 31, 2011 Non-Competition Agreements [Member] Iontas Limited [Member]	Oct. 31, 2011 Customer Relationships [Member] GMT [Member]	Oct. 31, 2011 Customer Relationships [Member] Vovici [Member]	Oct. 31, 2011 Customer Relationships [Member] Maximum [Member] Other Acquisitions [Member]	Oct. 31, 2011 Customer Relationships [Member] Minimum [Member] Other Acquisitions [Member]	Oct. 31, 2011 Trademarks And Trade Names [Member] GMT [Member]	Oct. 31, 2011 Trademarks And Trade Names [Member] Vovici [Member]	Oct. 31, 2011 Trademarks And Trade Names [Member] Other Acquisitions [Member]	Oct. 31, 2011 Other Identifiable Intangible Assets [Member] Maximum [Member] Other Acquisitions [Member]	Oct. 31, 2011 Other Identifiable Intangible Assets [Member] Minimum [Member] Other Acquisitions [Member]	Oct. 31, 2011 Accounts Payable [Member] Other Business Combinations [Member]	Oct. 31, 2011 Accounts Payable [Member] Verint [Member]	Oct. 31, 2011 Accounts Payable [Member] GMT [Member]	Oct. 31, 2011 Other Longterm Liabilities [Member] Other Business Combinations [Member]	Oct. 31, 2011 Other Longterm Liabilities [Member] Verint [Member]	Oct. 31, 2011 Other Longterm Liabilities [Member] GMT [Member]
Business Acquisition [Line Items]
Total consideration																					$ 21,700,000							$ 15,000,000
Cash consideration							24,596,000	55,708,000	55,708,000	55,708,000	21,965,000								24,600,000	56,100,000	17,700,000			34,100,000
Liability to repay bank debt					3,300,000													10,700,000		400,000
Business acquisition, options issued																42,000
Business acquisition, options issued, value assigned																1,000,000										100,000	900,000
Potential additional contingent payments, maximum																			17,400,000	19,100,000	3,800,000			27,300,000
Expenses recorded reflecting the impact of revised assessments of the probability of payment																				300,000
Estimated profit margin							20.00%			15.00%
Carrying value of acquiree deferred revenue							4,300,000			5,300,000
Fair value of the support obligations assumed										2,300,000																				1,200,000
Service revenue	249,491,000	248,527,000	677,418,000	667,126,000				2,300,000
Transaction costs directly related to acquisition										2,500,000		1,300,000	600,000	3,000,000
Contingent payments tied to certain performance targets period of achievement, in years																					2
Combined cash paid at the closings																								22,000,000
Ending of performance targets periods			January 31, 2013
Selling, general and administrative (expenses) benefit	(142,466,000)	(163,444,000)	(431,435,000)	(525,824,000)			(1,000,000)		(1,300,000)				900,000	1,100,000
Estimated useful lives (in years)																																		6	3
Weighted-average estimated useful life of acquired finite-lived identifiable intangible assets (in years)			7.5				7.3			8.1	6.7				5.9																5	6.0	6			10	10.0	10	4	3	5.0	5	4	3
Estimated fair value of the contingent consideration	34,623,000		34,623,000			3,686,000	12,000,000	9,900,000	9,900,000	9,900,000	11,804,000		10,700,000	10,700,000	3,200,000	10,200,000	9,900,000				3,200,000		1,700,000						11,800,000	12,000,000															3,100,000	5,900,000	2,900,000	7,600,000	4,300,000	9,100,000
Goodwill							21,653,000	37,647,000	37,647,000	37,647,000	19,554,000				12,800,000
Goodwill being assessed for tax deductibility													9,500,000	9,500,000
Goodwill not deductible for tax purpose														10,100,000
Evaluation of pre-acquisition business activities, liabilities recorded					3,300,000													10,700,000		400,000
Current liabilities assumed																5,500,000
Long-term liabilities assumed																5,200,000
Current liabilities																5,000,000
Long-term liabilities																4,800,000
Prepayments for product licenses and support services															1,500,000
Partial offset of trade accounts payable															700,000
Contingent consideration paid to former shareholders																						2,000,000
Developed technology assets acquired												6,900,000
Non-competition arrangements assets acquired												300,000
Tangible net assets acquired															1,700,000
Purchase Price Allocation, Goodwill							21,653,000	37,647,000	37,647,000	37,647,000	19,554,000				12,800,000
Changes in the fair value of contingent consideration recorded within selling, general and administrative expenses																							$ 200,000	$ 1,900,000	$ 200,000