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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		6 Months Ended
		Jul. 31, 2016	Jul. 31, 2015
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		$ 68,505	$ 98,854
Other comprehensive (loss) / income before reclassifications		14,987	(13,351)
Amounts reclassified from accumulated other comprehensive (loss) / income	[1]	(79)	41
Net current-period other comprehensive (loss) / income		14,908	(13,310)
Ending Balance		83,413	85,544
Currency Translation Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		68,265	98,642
Other comprehensive (loss) / income before reclassifications		14,832	(13,321)
Net current-period other comprehensive (loss) / income		14,832	(13,321)
Ending Balance		83,097	85,321
Available-for-sale securities
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		189	211
Other comprehensive (loss) / income before reclassifications		2	15
Net current-period other comprehensive (loss) / income		2	15
Ending Balance		191	226
Net Unrealized Income (Loss) On Hedging Contracts
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		51	1
Other comprehensive (loss) / income before reclassifications		153	(45)
Amounts reclassified from accumulated other comprehensive (loss) / income	[1]	(79)	41
Net current-period other comprehensive (loss) / income		74	(4)
Ending Balance		$ 125	$ (3)
[1] Amounts reclassified to earnings in the Consolidated Statements of Operations.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580

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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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