Derivatives And Financial Instruments (Schedule Of Derivative Positions And Respective Fair Values) (Details) (USD $) In Thousands, unless otherwise specified															3 Months Ended
	Apr. 30, 2012	Jan. 31, 2012	Apr. 30, 2012 Derivatives Not Designated As Hedging Instruments [Member] Short-Term Foreign Currency Forward [Member]	Jan. 31, 2012 Derivatives Not Designated As Hedging Instruments [Member] Short-Term Foreign Currency Forward [Member]	Apr. 30, 2012 Derivatives Designated As Hedging Instruments [Member] Short-Term Foreign Currency Forward [Member]	Jan. 31, 2012 Derivatives Designated As Hedging Instruments [Member] Short-Term Foreign Currency Forward [Member]	Apr. 30, 2012 Prepaid Expenses And Other Current Assets [Member] Derivatives Not Designated As Hedging Instruments [Member] Short-Term Foreign Currency Forward [Member]	Jan. 31, 2012 Prepaid Expenses And Other Current Assets [Member] Derivatives Not Designated As Hedging Instruments [Member] Short-Term Foreign Currency Forward [Member]	Apr. 30, 2012 Prepaid Expenses And Other Current Assets [Member] Derivatives Designated As Hedging Instruments [Member] Short-Term Foreign Currency Forward [Member]	Jan. 31, 2012 Prepaid Expenses And Other Current Assets [Member] Derivatives Designated As Hedging Instruments [Member] Short-Term Foreign Currency Forward [Member]	Apr. 30, 2012 Other Current Liabilities [Member] Derivatives Not Designated As Hedging Instruments [Member] Short-Term Foreign Currency Forward [Member]	Jan. 31, 2012 Other Current Liabilities [Member] Derivatives Not Designated As Hedging Instruments [Member] Short-Term Foreign Currency Forward [Member]	Apr. 30, 2012 Other Current Liabilities [Member] Derivatives Designated As Hedging Instruments [Member] Short-Term Foreign Currency Forward [Member]	Jan. 31, 2012 Other Current Liabilities [Member] Derivatives Designated As Hedging Instruments [Member] Short-Term Foreign Currency Forward [Member]	Apr. 30, 2012 Comverse [Member]	Apr. 30, 2012 Verint [Member]	Apr. 30, 2012 Starhome B V [Member]
Derivatives, Fair Value [Line Items]
Derivative maturity, months															12 months	12 months	12 months
Derivative asset, notional amount			$ 15,104	$ 8,976	$ 83,589	$ 100,219
Derivative assets, fair value	1,194	1,404					161	188	1,033	1,216
Derivative liabilities, notional amount			1,567	14,510	13,713	16,907
Derivative liabilities, fair value	$ 33	$ 530									$ 5	$ 303	$ 28	$ 227