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Fair Value Measurements (Tables) | 3 Months Ended
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Dec. 31, 2020
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 December 31, 2020 and September 30, 2020 were as follows:
(in thousands) |  | December 31, 2020 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Financial assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 202,004 |  |  | $ | — |  |  | $ | — |  |  | $ | 202,004 |
Derivative instruments |  |  | — |  |  |  | 1,745 |  |  |  | — |  |  |  | 1,745 |
Convertible note |  |  | — |  |  |  | — |  |  |  | 1,000 |  |  |  | 1,000 |
Total financial assets |  | $ | 202,004 |  |  | $ | 1,745 |  |  | $ | 1,000 |  |  | $ | 204,749 |
Financial liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward contracts |  |  | — |  |  |  | 913 |  |  |  | — |  |  |  | 913 |
Total financial liabilities |  | $ | — |  |  | $ | 913 |  |  | $ | — |  |  | $ | 913 |
(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 |
Summary of Changes in Fair Value of Level 3 Investment | The following table provides a summary of changes in the fair value of our Level 3 investment for the three months ended December 31, 2020 (in thousands):
Balance, October 1, 2020 |  | $ | — |
Investment |  |  | 1,000 |
Balance, December 31, 2020 |  | $ | 1,000 |

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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 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 (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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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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