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Fair Value Measurements (Tables)
9 Months Ended
Jun. 30, 2023
Fair Value Disclosures [Abstract]  
Schedule of Financial Assets Measured 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 June 30, 2023 and September 30, 2022, were as follows (in thousands):
  Gross Unrealized Classification on Balance Sheet
As of June 30, 2023Fair 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 FundsLevel 1$186,499 $— $— $186,499 $186,499 $— $— 
Corporate bonds and notesLevel 27,271 — (144)7,127 — 6,354 773 
Municipal bonds and notesLevel 22,156 — (31)2,125 — 2,125 — 
U.S. government securitiesLevel 22,899 — (34)2,865 — 2,865 — 
U.S. government agency securitiesLevel 21,785 — (20)1,765 — 1,765 — 
Total debt investments$200,610 $— $(229)$200,381 $186,499 $13,109 $773 
Changes in fair value recorded in other net income (expense)
Equity investments*$5,114 $— $— $5,114 
Total equity investments5,114 — — 5,114 
Total investments$205,495 $186,499 $13,109 $5,887 
 * The fair value of this equity investment is measured at net asset value (NAV) which approximates fair value and is not classified within the fair value hierarchy.
  Gross Unrealized Classification on Balance Sheet
As of September 30, 2022Fair 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 FundsLevel 1$276,294 $— $— $276,294 $276,294 $— $— 
Corporate bonds and notesLevel 250,828 — (950)49,878 912 44,356 4,610 
Municipal bonds and notesLevel 25,018 — (102)4,916 — 3,812 1,104 
U.S. government securitiesLevel 284,734 — (660)84,074 10,120 73,954 — 
U.S. government agency securitiesLevel 25,825 — (75)5,750 606 4,432 712 
Total debt investments$422,699 $— $(1,787)$420,912 $287,932 $126,554 $6,426 
Changes in fair value recorded in other net income (expense)
Equity investments*$3,118 $— $— $3,118 
Total equity investments3,118 — — 3,118 
Total investments$424,030 $287,932 $126,554 $9,544 
* The fair value of this equity investment is measured at NAV which approximates fair value and is not classified within the fair value hierarchy.