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Derivative Financial Instruments (Details Textual) $ in Thousands		3 Months Ended		6 Months Ended
		Jul. 31, 2018 USD ($)	Jul. 31, 2017 USD ($)	Jul. 31, 2018 USD ($)		Jul. 31, 2017 USD ($)		Jul. 31, 2018 CHF (SFr)	Jul. 31, 2018 EUR (€)	Jul. 31, 2018 GBP (£)
Derivatives Fair Value [Line Items]
Net change in effective portion of hedging contracts		$ 100	$ 400	$ 100		$ 400
Net change in effective portion of hedging contracts, tax			100			100
Maximum length of time hedged in cash flow hedge				24 months
Amounts reclassified from accumulated other comprehensive income (loss)	[1]			$ (276)		442
Net Unrealized Income (Loss) On Hedging Contracts
Derivatives Fair Value [Line Items]
Amounts reclassified from accumulated other comprehensive income (loss)		(300)	400	(276)	[1]	442	[1]
Accumulated other comprehensive income, tax expense (benefit)		$ (100)	$ (100)	$ (100)		$ (100)
Foreign Exchange Forward
Derivatives Fair Value [Line Items]
Net forward contracts hedging portfolio								SFr 30,000,000	€ 11,500,000	£ 800,000
Maximum
Derivatives Fair Value [Line Items]
Expiry dates ranging				Jan. 01, 2019
[1] Amounts reclassified to earnings in the Consolidated Statements of Operations.

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Accumulated other comprehensive income loss cumulative changes in net gain loss from cash flow hedges effect tax.

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Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

+ References

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Date the derivative contract matures, in CCYY-MM-DD format.

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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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Maximum length of time over which the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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

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