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Derivative Financial Instruments - Notional Amounts of Derivative Instruments (Detail) $ in Thousands | Sep. 30, 2018 USD ($)
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Foreign exchange contracts | $ 1,147,934

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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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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration