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Fair Value Measurements (Tables) | 6 Months Ended
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Mar. 31, 2021
Fair Value Disclosures [Abstract] |
Fair Value, by Balance Sheet Grouping | Our significant financial assets and liabilities measured at fair value on a recurring basis as of March 31, 2021 and September 30, 2020 were as follows:
(in thousands) |  | March 31, 2021 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Financial assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 115,533 |  |  | $ | — |  |  | $ | — |  |  | $ | 115,533 |
Derivative instruments |  |  | — |  |  |  | 6,846 |  |  |  | — |  |  |  | 6,846 |
Convertible note |  |  | — |  |  |  | — |  |  |  | 1,000 |  |  |  | 1,000 |
Total financial assets |  | $ | 115,533 |  |  | $ | 6,846 |  |  | $ | 1,000 |  |  | $ | 123,379 |
Financial liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward contracts |  |  | — |  |  |  | 4,259 |  |  |  | — |  |  |  | 4,259 |
Total financial liabilities |  | $ | — |  |  | $ | 4,259 |  |  | $ | — |  |  | $ | 4,259 |
(in thousands) |  | September 30, 2020 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Financial assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 105,299 |  |  | $ | — |  |  | $ | — |  |  | $ | 105,299 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate notes/bonds |  |  | 59,099 |  |  |  | — |  |  |  | — |  |  |  | 59,099 |
Derivative instruments |  |  | — |  |  |  | 903 |  |  |  | — |  |  |  | 903 |
Total financial assets |  | $ | 164,398 |  |  | $ | 903 |  |  | $ | — |  |  | $ | 165,301 |
Financial liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward contracts |  |  | — |  |  |  | 1,073 |  |  |  | — |  |  |  | 1,073 |
Total financial liabilities |  | $ | — |  |  | $ | 1,073 |  |  | $ | — |  |  | $ | 1,073 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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