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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

Fiscal Year Ended September 30,

    

2019

    

2018

    

2017

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

$

3,656

$

(330)

$

(545)

Schedule of Fair Value Derivative Instruments

Fair Value of Assets

Fair Value of Liabilities

As of September 30,

2019

2018

2019

2018

Derivatives not designated as hedging instruments

Foreign exchange contracts

$

17

$

170

$

(340)

$

(177)

Total

$

17

$

170

$

(340)

$

(177)