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Derivative Instruments (Tables)
12 Months Ended
Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Net Gains and Losses Realized on Derivative Instruments

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Fiscal Year Ended September 30,

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2019

    

2018

    

2017

Realized gains (losses) on derivatives not designated as hedging instruments

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$

3,656

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$

(330)

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$

(545)

Schedule of Fair Value Derivative Instruments

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Fair Value of Assets

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Fair Value of Liabilities

As of September 30,

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2019

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2018

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2019

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2018

Derivatives not designated as hedging instruments

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Foreign exchange contracts

$

17

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$

170

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$

(340)

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$

(177)

Total

$

17

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$

170

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$

(340)

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$

(177)