Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2015		Jan. 31, 2014		Jan. 31, 2013
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 103,702		$ 102,271
Other comprehensive (loss) / income before reclassifications	(4,767)		1,348
Amounts reclassified from accumulated other comprehensive income	(81)	[1]	83	[1]
Net current-period other comprehensive (loss)	(4,848)		1,431
Ending Balance	98,854		103,702
Currency Translation Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	103,438		102,220
Other comprehensive (loss) / income before reclassifications	(4,796)		1,135
Amounts reclassified from accumulated other comprehensive income			83	[1]
Net current-period other comprehensive (loss)	(4,796)		1,218
Ending Balance	98,642		103,438
Available-for-sale securities
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	263		50
Other comprehensive (loss) / income before reclassifications	29		213
Amounts reclassified from accumulated other comprehensive income	(81)	[1]
Net current-period other comprehensive (loss)	(52)		213
Ending Balance	211		263
Net Unrealized Income On Hedging Contracts
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance					1
Ending Balance	$ 1		$ 1		$ 1

[1] Amounts in fiscal 2015 and 2014 were reclassified to Selling, General and Administrative expenses.