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Fair Value Measures and Disclosures | 9 Months Ended
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Jun. 30, 2026
Fair Value Disclosures [Abstract] |
Fair Value Disclosures [Text Block] | Fair Value Measurements Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis The Company's financial assets measured at fair value on a recurring basis at June 30, 2026 and September 30, 2025, were as follows (in thousands):
|  |  |  |  |  | Gross Unrealized |  |  |  | Classification on Balance Sheet
June 30, 2026 |  | Fair Value Level |  | Cost or Amortized Cost |  | Gains |  | Losses |  | Aggregate Fair Value |  | Cash and Cash Equivalents |  | Short-Term Investments |  | Long-Term Investments
Changes in fair value recorded in other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | Level 1 |  | $ | 828,013 |  |  | $ | — |  |  | $ | — |  |  | $ | 828,013 |  |  | $ | 828,013 |  |  | $ | — |  |  | $ | — |
Total cash equivalents |  |  |  | $ | 828,013 |  |  | $ | — |  |  | $ | — |  |  | $ | 828,013 |  |  | $ | 828,013 |  |  | $ | — |  |  | $ | — |
Changes in fair value recorded in other net income (expense): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investments |  | * |  |  |  |  |  |  |  | $ | 21,991 |  |  | $ | — |  |  | $ | — |  |  | $ | 21,991 |
Total equity investments |  |  |  |  |  |  |  |  |  | 21,991 |  |  | — |  |  | — |  |  | 21,991 |
Total |  |  |  |  |  |  |  |  |  | $ | 850,004 |  |  | $ | 828,013 |  |  | $ | — |  |  | $ | 21,991 |
* Equity investments presented in the table above include investments without readily determinable fair values that are measured at fair value using net asset value ("NAV") as a practical expedient, or are measured at cost with adjustments for observable changes in price or impairments. The equity investments are not classified within the fair value hierarchy.
|  |  |  |  |  | Gross Unrealized |  |  |  | Classification on Balance Sheet
September 30, 2025 |  | Fair Value Level |  | Cost or Amortized Cost |  | Gains |  | Losses |  | Aggregate Fair Value |  | Cash and Cash Equivalents |  | Short-Term Investments |  | Long-Term Investments
Changes in fair value recorded in other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | Level 1 |  | $ | 642,997 |  |  | $ | — |  |  | $ | — |  |  | $ | 642,997 |  |  | $ | 642,997 |  |  | $ | — |  |  | $ | — |
Total cash equivalents |  |  |  | $ | 642,997 |  |  | $ | — |  |  | $ | — |  |  | $ | 642,997 |  |  | $ | 642,997 |  |  | $ | — |  |  | $ | — |
Changes in fair value recorded in other net income (expense): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investments |  | * |  |  |  |  |  |  |  | $ | 15,693 |  |  | $ | — |  |  | $ | — |  |  | $ | 15,693 |
Total equity investments |  |  |  |  |  |  |  |  |  | 15,693 |  |  | — |  |  | — |  |  | 15,693 |
Total |  |  |  |  |  |  |  |  |  | $ | 658,690 |  |  | $ | 642,997 |  |  | $ | — |  |  | $ | 15,693 |
* Equity investments presented in the table above include investments without readily determinable fair values that are measured at fair value using NAV as a practical expedient, or are measured at cost with adjustments for observable changes in price or impairments. The equity investments are not classified within the fair value hierarchy. The Company uses the fair value hierarchy for financial assets and liabilities. The carrying amounts of other current financial assets and other current financial liabilities approximate fair value due to their short-term nature. Interest income from cash, cash equivalents, and investments was $9.9 million and $10.1 million for the three months ended June 30, 2026 and 2025, respectively, and $27.0 million and $27.6 million for the nine months ended June 30, 2026 and 2025, respectively. Interest income is included in other income, net in the accompanying consolidated income statements. There were no unrealized losses on investments held for a period greater than 12 months at June 30, 2026 and September 30, 2025. The Company determined that as of June 30, 2026, there were no credit losses on any investments within its portfolio. Assets Measured and Recorded at Fair Value on a Non-Recurring Basis The Company's non-financial long-lived assets, which include goodwill and other intangible assets, are not required to be carried at fair value on a recurring basis. These non-financial assets are measured at fair value on a non-recurring basis when there is an indicator of impairment, and they are recorded at fair value only when impairment is recognized. The Company reviews goodwill for impairment annually, during the second quarter of each fiscal year, or as circumstances indicate the possibility of impairment. The Company monitors the carrying value of tangible and intangible long-lived assets for impairment whenever events or changes in circumstances indicate its carrying amount may not be recoverable. Impairment charges related to non-financial long-lived assets for the three and nine months ended June 30, 2026 and 2025 were not material.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 107 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-107 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 940 -SubTopic 820 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478119/940-820-50-1 + Details
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