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Fair Value Measurements (Tables)
9 Months Ended
Jun. 30, 2022
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, 2022 and September 30, 2021, were as follows (in thousands):
  Gross Unrealized Classification on Balance Sheet
As of June 30, 2022Fair 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
Money Market FundsLevel 1$79,183 $— $— $79,183 $79,183 $— $— 
Certificates of depositLevel 2250 — — 250 — 250 — 
Corporate bonds and notesLevel 293,016 (1,086)91,931 — 81,499 10,432 
Municipal bonds and notesLevel 27,661 — (110)7,551 1,392 4,013 2,146 
U.S. government securitiesLevel 2110,639 — (979)109,660 — 106,855 2,805 
U.S. government agency securitiesLevel 25,647 — (77)5,570 — 3,841 1,729 
Total debt investments$296,396 $$(2,252)$294,145 $80,575 $196,458 $17,112 
Changes in fair value recorded in other net income (expense)
Equity investments*$2,000 $— $— $2,000 
Total equity investments2,000 — — 2,000 
Total investments$296,145 $80,575 $196,458 $19,112 
 * 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, 2021Fair 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
Money Market FundsLevel 1$17,150 $— $— $17,150 $17,150 $— $— 
Certificates of depositLevel 2255 — — 255 — 255 — 
Corporate bonds and notesLevel 2243,568 129 (86)243,611 4,397 186,107 53,107 
Municipal bonds and notesLevel 224,684 (9)24,677 — 13,566 11,111 
U.S. government securitiesLevel 2162,221 14 (12)162,223 — 102,615 59,608 
U.S. government agency securitiesLevel 236,053 — (14)36,039 — 27,087 8,952 
Total investments$483,931 $145 $(121)$483,955 $21,547 $329,630 $132,778 
Property, Plant and Equipment
Impairment charges were allocated to the following income statement line items for the three and nine months ended June 30, 2022 and 2021 (in thousands):
 Three months ended
June 30,
Nine months ended
June 30,
 2022202120222021
Cost of net product revenue$— $— $— $2,865 
Cost of net service revenue— — — 3,492 
Sales and marketing— — 6,175 11,515 
Research and development— — — 12,974 
General and administrative— — — 9,852 
Total impairment charges$— $— $6,175 $40,698