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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
		Jul. 31, 2017	Jul. 31, 2017		Jul. 31, 2016
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance			$ 473,993
Other comprehensive income before reclassifications			9,140		$ 14,987
Amounts reclassified from accumulated other comprehensive income	[1]		(442)		(79)
Net current-period other comprehensive income / (loss)			8,698		14,908
Ending Balance		$ 478,158	478,158		458,983
Currency Translation Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance			76,569		68,265
Other comprehensive income before reclassifications			9,108		14,832
Net current-period other comprehensive income / (loss)			9,108		14,832
Ending Balance		85,677	85,677		83,097
Available-for-sale securities
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance			197		189
Other comprehensive income before reclassifications			1		2
Net current-period other comprehensive income / (loss)			1		2
Ending Balance		198	198		191
Hedging Contracts
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance			14		51
Other comprehensive income before reclassifications			31		153
Amounts reclassified from accumulated other comprehensive income		(400)	(442)	[1]	(79)	[1]
Net current-period other comprehensive income / (loss)			(411)		74
Ending Balance		(397)	(397)		125
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance			76,780		68,505
Ending Balance		$ 85,478	$ 85,478		$ 83,413
[1] Amounts 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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