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Derivative Instruments - Additional Information (Details) (Forward Contracts [Member]) In Thousands, unless otherwise specified	Apr. 30, 2014 USD ($)	Apr. 30, 2014 Short [Member] GBP (£)
Derivatives, Fair Value [Line Items]
Derivative, notional amount	$ 57,631invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember	£ 34,389invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / us-gaap_PositionAxis = us-gaap_ShortMember

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

+ Details

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Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

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- Details

Name:	us-gaap_DerivativesFairValueLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration