Derivatives And Financial Instruments (Schedule Of Derivative Positions And Respective Fair Values) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 31, 2012	Jan. 31, 2012
Derivatives, Fair Value [Line Items]
Derivative maturity, months	12 months
Derivative assets, fair value	$ 241	$ 1,214
Derivative liabilities, fair value	3,703	530
Derivatives Not Designated As Hedging Instruments | Short-Term Foreign Currency Forward
Derivatives, Fair Value [Line Items]
Derivative asset, notional amount	10,000	99,319
Derivative liabilities, notional amount		14,510
Derivatives Designated As Hedging Instruments | Short-Term Foreign Currency Forward
Derivatives, Fair Value [Line Items]
Derivative asset, notional amount	10,278
Derivative liabilities, notional amount	96,570	16,907
Prepaid Expenses And Other Current Assets | Derivatives Not Designated As Hedging Instruments | Short-Term Foreign Currency Forward
Derivatives, Fair Value [Line Items]
Derivative assets, fair value	97	1,214
Prepaid Expenses And Other Current Assets | Derivatives Designated As Hedging Instruments | Short-Term Foreign Currency Forward
Derivatives, Fair Value [Line Items]
Derivative assets, fair value	144
Other Current Liabilities | Derivatives Not Designated As Hedging Instruments | Short-Term Foreign Currency Forward
Derivatives, Fair Value [Line Items]
Derivative liabilities, fair value		303
Other Current Liabilities | Derivatives Designated As Hedging Instruments | Short-Term Foreign Currency Forward
Derivatives, Fair Value [Line Items]
Derivative liabilities, fair value	$ 3,703	$ 227
Verint
Derivatives, Fair Value [Line Items]
Derivative maturity, months	12 months
Starhome
Derivatives, Fair Value [Line Items]
Derivative maturity, months	12 months