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Derivative Financial Instruments - Summary of Outstanding Forward Foreign Currency Contracts by Currency (Details) - Foreign Currency Forward Contracts - Not Designated as Hedging Instrument € in Thousands, £ in Thousands, $ in Thousands, $ in Thousands | Sep. 30, 2019 GBP (£) | Sep. 30, 2019 SGD ($) | Sep. 30, 2019 EUR (€) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 GBP (£) | Sep. 30, 2018 SGD ($) | Sep. 30, 2018 EUR (€) | Sep. 30, 2018 USD ($)
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Foreign Exchange Contracts To Sell European Euro for US Dollar | Short |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Contract amount of forward foreign currency contracts |  |  | € 10,800 | $ 11,723 |  |  | € 9,000 | $ 10,372
Fair value of forward foreign currency contracts to sell and buy foreign currency |  |  |  | 0 |  |  |  | 0
Foreign Exchange Contracts To Purchase British Pounds With US Dollars | Long |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Contract amount of forward foreign currency contracts | £ 5,200 |  |  | 6,400 | £ 8,598 |  |  | 11,200
Fair value of forward foreign currency contracts to sell and buy foreign currency |  |  |  | 0 |  |  |  | 0
Foreign Exchange Contracts To Purchase Singapore Dollars With United States Dollars | Long |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Contract amount of forward foreign currency contracts |  | $ 5,798 |  | 4,200 |  | $ 9,580 |  | 7,000
Fair value of forward foreign currency contracts to sell and buy foreign currency |  |  |  | $ 0 |  |  |  | $ 0

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