Stock-Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2011	Jul. 31, 2010	Jan. 31, 2011
Number of deferred stock units granted	340,397	366,000	1,325,116	1,379,000
Common stock available for future grant, number of shares	1,175,319		1,175,319
Commitment to issue shares of common stock to holders of vested restricted awards, number of shares	1,074,866		1,074,866
Unvested options included in outstanding stock options	147,134		147,134
Unvested options, weighted-average grant date fair value	$ 2.34		$ 2.34
Unvested options, expected term			4.0
Unvested stock options, total fair value	$ 0.3		$ 0.3
Fair value of stock options vested	0.4	0.6	0.4	0.6
Stock Options [Member]
Stock options to purchase shares of common stock, number of shares	11,013,068		11,013,068
Unrecognized compensation cost	0.3		0.3
Unrecognized compensation expense period of recognition, in years			0.8
Restricted Stock Awards [Member]
Fair value of Restricted Awards vested	0.5		8.8
Unrecognized compensation cost	12.4		12.4
Unrecognized compensation expense period of recognition, in years			2.1
Restricted stock, outstanding	1,965,377		1,965,377
Restricted Stock Awards [Member] | Verint System [Member]
Restricted stock, outstanding	1,500,000		1,500,000
Restricted Stock Units (RSUs) [Member] | Verint System [Member]
Number of stock units granted	900,000		900,000
Unrecognized compensation cost	29.2		29.2
Unrecognized compensation expense period of recognition, in years			1.8
Weighted-average grant date fair value			$ 30.24
Phantom Stock Units (RSUs) [Member] | Verint System [Member]
Number of stock units granted				200,000
Cash payments upon vesting of stock units	3.4	5.2	10.3	15.8
Total accrued liabilities	1.8		1.8		9.8
Combined Restricted Stock Units [Member] | Verint System [Member]
Number of stock units granted			1,000,000
Restricted stock, outstanding		2,900,000		2,900,000
Weighted-average grant date fair value				$ 14.41
President And Chief Executive Officer [Member]
Number of deferred stock units granted				300,000
Executive Vice President And Chief Financial Officer [Member]
Number of deferred stock units granted				150,000
Verint System [Member]
Converted into stock options to purchase of common stock			3,100,000
Common stock were issued pursuant to stock option exercises	174,000	726,000	432,000
Total proceeds received upon exercise of stock options	$ 3.5	$ 11.9	$ 8.7
Stock options exercisable	1,300,000		1,300,000