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Derivative Financial Instruments (Tables)

12 Months Ended

Sep. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Notional Amounts of Outstanding Derivative Positions

The following tables summarize our outstanding foreign currency forward contracts, by currency at September 30, 2018 and 2017:

	September 30, 2018
	Contract Amount								Fair Value
	Foreign Currency				US$				US$
		(In thousands)
Sell foreign currency:
Euro (EUR)	EUR	9,000			$	10,372			—
Buy foreign currency:
British pound (GBP)	GBP	8,598			$	11,200			—
Singapore dollar (SGD)	SGD	9,580			$	7,000			—

	September 30, 2017
	Contract Amount								Fair Value
	Foreign Currency				US$				US$
		(In thousands)
Sell foreign currency:
Euro (EUR)	EUR	5,050			$	5,968			—
Buy foreign currency:
British pound (GBP)	GBP	9,341			$	12,500			—

Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance

These amounts are shown below for the years ended September 30, 2018, 2017 and 2016:

	Year Ended September 30,
	2018				2017				2016
	(In thousands)
Gain (loss) on foreign currency forward contracts	$	(476	)		$	210			$	(2,911	)

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- Definition

Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4E
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624181-113959

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959

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- Definition

Tabular disclosure of the notional amounts of outstanding derivative positions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

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