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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		12 Months Ended
		Jan. 31, 2017	Jan. 31, 2016
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		$ 440,552
Other comprehensive income / (loss) before reclassifications		7,989	$ (30,349)
Amounts reclassified from accumulated other comprehensive income	[1]	286
Net current-period other comprehensive income / (loss)		8,275	(30,349)
Ending Balance		473,993	440,552
Currency Translation Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		68,265	98,642
Other comprehensive income / (loss) before reclassifications		8,389	(30,377)
Amounts reclassified from accumulated other comprehensive income	[1]	(85)
Net current-period other comprehensive income / (loss)		8,304	(30,377)
Ending Balance		76,569	68,265
Available-for-sale securities
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		189	211
Other comprehensive income / (loss) before reclassifications		8	(22)
Net current-period other comprehensive income / (loss)		8	(22)
Ending Balance		197	189
Hedging Contracts
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		51	1
Other comprehensive income / (loss) before reclassifications		(408)	50
Amounts reclassified from accumulated other comprehensive income	[1]	371
Net current-period other comprehensive income / (loss)		(37)	50
Ending Balance		14	51
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		68,505	98,854
Ending Balance		$ 76,780	$ 68,505
[1] Amounts in fiscal 2017 and 2016 were reclassified to earnings in the Consolidated Statements of Operations.

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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