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Derivative Instruments and Foreign Currency Exposure (Details ) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Oct. 31, 2011	Jan. 31, 2012
Derivatives not designated as hedging instruments, Foreign Exchange Forward Contracts
Notional Value in USD	$ 11,175	$ 3,444	$ 36,501	$ 9,950
Gain and loss reported in current operating income (expense)	205	41	261	(130)
Derivatives designated as hedging instruments, Asset Derivative from Foreign Currency Cash Flow Hedge
Notional Value in USD	6,777		6,777		6,904
Gain and (loss) reported in equity as other comprehensive income	11		11		123
Effect of Derivative on Income Statement from Foreign Currency Cash Flow Hedge
Gain reclassed from other comprehensive income into current earnings during nine months ended October 31, 2012 reported in operating income			$ 33	$ 30

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Aggregate notional amount of all foreign currency derivative not designated as hedging instrument. Notional amount refers to the number of currency units specified in the foreign currency derivative contract.

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Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

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Amount before tax and reclassification adjustments, resulting from the process of expressing in the reporting currency of the reporting entity those amounts that are denominated or measured in a different currency, and from transactions whose terms are denominated in a currency other than the entity's functional currency.

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