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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 (£)
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Derivatives, Fair Value [Line Items] |  |
Derivative, notional amount | $ 57,631 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember | £ 34,389 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / us-gaap_PositionAxis = us-gaap_ShortMember

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