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Derivative Financial Instruments (Tables) | 12 Months Ended
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Sep. 30, 2017
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, 2017 and 2016:
| 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 |  |  | — |
| September 30, 2016
| Contract Amount |  | Fair Value
| Foreign Currency |  | US$ |  | US$
|  | (In thousands)
Sell foreign currency: |  |  |  |  |  |
Euro (EUR) | EUR | 7,850 |  |  | $ | 8,743 |  |  | — |
Buy foreign currency: |  |  |  |  |  |
British pound (GBP) | GBP | 7,721 |  |  | $ | 10,000 |  |  | — |
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance | These amounts are shown below for the years ended September 30, 2017, 2016 and 2015:
| Year Ended September 30,
| 2017 |  | 2016 |  | 2015
| (In thousands)
Gain (loss) on foreign currency forward contracts | $ | 210 |  |  | $ | (2,911 | ) |  | $ | (62 | )

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 + Details
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- Definition Tabular disclosure of the notional amounts of outstanding derivative positions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 + Details
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