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Fair Value Measurements (Tables) | 12 Months Ended
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Sep. 30, 2023
Fair Value Disclosures [Abstract] |
Summary of assets and liabilities measured and recorded at fair value on a recurring basis | The following tables summarize assets and liabilities measured and recorded at fair value on a recurring basis in the accompanying Consolidated Balance Sheets as of September 30, 2023 and 2022 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of September 30, 2023
Description | ​ | Total Fair Value | ​ | Level 1 | ​ | Level 2 | ​ | Level 3
Assets: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Cash equivalents | ​ | $ | 525,952 | ​ | $ | 525,952 | ​ | $ | — | ​ | $ | —
Available-for-sale securities | ​ |  | 450,211 | ​ |  | 85,949 | ​ | ​ | 364,262 | ​ |  | —
Foreign exchange contracts | ​ |  | 44 | ​ |  | — | ​ |  | 44 | ​ |  | —
Net investment hedge | ​ |  | 13,036 | ​ |  | — | ​ |  | 13,036 | ​ |  | —
Total assets | ​ | $ | 989,243 | ​ | $ | 611,901 | ​ | $ | 377,342 | ​ | $ | —
Liabilities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Foreign exchange contracts | ​ | ​ | 421 | ​ | ​ | — | ​ | ​ | 421 | ​ | ​ | —
Total liabilities | ​ | $ | 421 | ​ | $ | — | ​ | $ | 421 | ​ | $ | —
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of September 30, 2022
Description | ​ | Total Fair Value | ​ | Level 1 | ​ | Level 2 | ​ | Level 3
Assets: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Cash equivalents | ​ | $ | 374,804 | ​ | $ | 374,055 | ​ | $ | 749 | ​ | $ | —
Available-for-sale securities | ​ |  | 1,263,782 | ​ |  | 651,800 | ​ |  | 611,982 | ​ |  | —
Foreign exchange contracts | ​ |  | 634 | ​ |  | — | ​ |  | 634 | ​ |  | —
Net investment hedge | ​ | ​ | 124,789 | ​ | ​ | — | ​ | ​ | 124,789 | ​ | ​ | —
Total assets | ​ | $ | 1,764,009 | ​ | $ | 1,025,855 | ​ | $ | 738,154 | ​ | $ | —
Liabilities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Foreign exchange contracts | ​ | ​ | 230 | ​ | $ | — | ​ | ​ | 230 | ​ | ​ | —
Total liabilities | ​ | $ | 230 | ​ | $ | — | ​ | $ | 230 | ​ | $ | —

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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