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Fair Value Measurements
 12 Months Ended
Sep. 30, 2025
Fair Value Disclosures [Abstract]  
Fair Value Measurements 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 subject to the disclosure requirements at September 30, 2025 and 2024, were as follows (in thousands):
  Gross Unrealized Classification on Balance Sheet
As of September 30, 2025Fair 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 investments15,693 — — 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 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
As of September 30, 2024Fair Value LevelCost 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$437,273 $— $— $437,273 $437,273 $— $— 
Total cash equivalents
$437,273 $— $— $437,273 $437,273 $— $— 
Changes in fair value recorded in other net income (expense):
Equity investments**$8,580 $— $— $8,580 
Total equity investments8,580 — — 8,580 
Total
$445,853 $437,273 $— $8,580 
** The fair value of this equity investment is measured at NAV which approximates fair value and is 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 $40.8 million, $35.1 million and $18.2 million for the years ended September 30, 2025, 2024, and 2023, respectively. Interest income is included in other income (expense), net on the Company's consolidated income statements. There were no unrealized losses on investments that were held for a period greater than 12 months at September 30, 2025 and 2024.
The Company determined that as of September 30, 2025, 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.
During the year ended September 30, 2023, the Company recorded an impairment of $3.5 million against the operating lease right-of-use asset related to its third quarter of fiscal 2023 restructuring plan, see Note 13, Restructuring Charges. The charge was reflected in the Restructuring Charges line item on the Company's consolidated income statement.
The Company did not recognize any other material impairment charges related to non-financial long-lived assets for the years ended September 30, 2025, 2024, and 2023.