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Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Financial assets: |  |  |
Cash equivalents | [1] | $ 105,299 | $ 108,020
Marketable securities: |  | 59,099 | 57,435
Forward contracts |  | 903 | 3,064
Financial assets, fair value |  | 165,301 | 168,519
Financial liabilities: |  |  |
Forward contracts |  | 1,073 | 2,771
Financial liabilities, fair value |  | 1,073 | 2,771
Corporate notes/bonds |  |  |
Financial assets: |  |  |
Marketable securities: |  | 59,099 | 56,436
Commercial paper |  |  |
Financial assets: |  |  |
Marketable securities: |  |  | 999
Level 1 |  |  |
Financial assets: |  |  |
Cash equivalents | [1] | 105,299 | 108,020
Forward contracts |  | 0 | 0
Financial assets, fair value |  | 164,398 | 164,456
Financial liabilities: |  |  |
Forward contracts |  | 0 | 0
Financial liabilities, fair value |  | 0 | 0
Level 1 | Corporate notes/bonds |  |  |
Financial assets: |  |  |
Marketable securities: |  | 59,099 | 56,436
Level 1 | Commercial paper |  |  |
Financial assets: |  |  |
Marketable securities: |  |  | 0
Level 2 |  |  |
Financial assets: |  |  |
Cash equivalents | [1] | 0 | 0
Forward contracts |  | 903 | 3,064
Financial assets, fair value |  | 903 | 4,063
Financial liabilities: |  |  |
Forward contracts |  | 1,073 | 2,771
Financial liabilities, fair value |  | 1,073 | 2,771
Level 2 | Corporate notes/bonds |  |  |
Financial assets: |  |  |
Marketable securities: |  | 0 | 0
Level 2 | Commercial paper |  |  |
Financial assets: |  |  |
Marketable securities: |  |  | 999
Level 3 |  |  |
Financial assets: |  |  |
Cash equivalents | [1] | 0 | 0
Forward contracts |  | 0 | 0
Financial assets, fair value |  | 0 | 0
Financial liabilities: |  |  |
Forward contracts |  | 0 | 0
Financial liabilities, fair value |  | 0 | 0
Level 3 | Corporate notes/bonds |  |  |
Financial assets: |  |  |
Marketable securities: |  | $ 0 | 0
Level 3 | Commercial paper |  |  |
Financial assets: |  |  |
Marketable securities: |  |  | $ 0
[1] | Money market funds and time deposits.

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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