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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018		Jul. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance				$ 470,335
Other comprehensive (loss) / income before reclassifications				(20,217)		$ 9,140
Amounts reclassified from accumulated other comprehensive income	[1]			276		(442)
Net current-period other comprehensive (loss) / income				(19,941)		8,698
Ending Balance		$ 463,354	$ 478,158	463,354		478,158
Currency Translation Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance				100,190		76,569
Other comprehensive (loss) / income before reclassifications				(19,901)		9,108
Net current-period other comprehensive (loss) / income				(19,901)		9,108
Ending Balance		80,289	85,677	80,289		85,677
Available-for-sale securities
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance				191		197
Other comprehensive (loss) / income before reclassifications				64		1
Net current-period other comprehensive (loss) / income				64		1
Ending Balance		255	198	255		198
Hedging Contracts
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance				(38)		14
Other comprehensive (loss) / income before reclassifications				(380)		31
Amounts reclassified from accumulated other comprehensive income		300	(400)	276	[1]	(442)	[1]
Net current-period other comprehensive (loss) / income				(104)		(411)
Ending Balance		(142)	(397)	(142)		(397)
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance				100,343		76,780
Ending Balance		$ 80,402	$ 85,478	$ 80,402		$ 85,478
[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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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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