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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 ($)	Sep. 30, 2018 EUR (€)	Sep. 30, 2018 USD ($)
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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- Definition

Nominal or face amount used to calculate payments on the derivative asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
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-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959

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