XML 88 R53.htm IDEA: XBRL DOCUMENT v3.23.2
Investments & Fair Value Measurements - Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Sep. 30, 2022
Debt Securities, Available-for-Sale [Line Items]    
Less Than 12 Months, Fair Value $ 128,417 $ 240,170
Less Than 12 Months, Gross Unrealized Losses (1,150) (4,895)
12 Months or Greater, Fair Value 56,879 31,603
12 Months or Greater, Gross Unrealized Loss (2,134) (1,104)
Certificate of deposit    
Debt Securities, Available-for-Sale [Line Items]    
Less Than 12 Months, Fair Value 9,916 10,352
Less Than 12 Months, Gross Unrealized Losses (12) (47)
12 Months or Greater, Fair Value 0 0
12 Months or Greater, Gross Unrealized Loss 0 0
U.S. agency securities    
Debt Securities, Available-for-Sale [Line Items]    
Less Than 12 Months, Fair Value 842 13,144
Less Than 12 Months, Gross Unrealized Losses (18) (5)
12 Months or Greater, Fair Value 0 1,395
12 Months or Greater, Gross Unrealized Loss 0 (55)
Government bonds    
Debt Securities, Available-for-Sale [Line Items]    
Less Than 12 Months, Fair Value 33,190 89,741
Less Than 12 Months, Gross Unrealized Losses (332) (2,593)
12 Months or Greater, Fair Value 38,862 8,566
12 Months or Greater, Gross Unrealized Loss (1,443) (332)
Commercial paper    
Debt Securities, Available-for-Sale [Line Items]    
Less Than 12 Months, Fair Value 5,576 5,770
Less Than 12 Months, Gross Unrealized Losses (4) (15)
12 Months or Greater, Fair Value 0 0
12 Months or Greater, Gross Unrealized Loss 0 0
Corporate bonds    
Debt Securities, Available-for-Sale [Line Items]    
Less Than 12 Months, Fair Value 58,578 81,044
Less Than 12 Months, Gross Unrealized Losses (602) (1,523)
12 Months or Greater, Fair Value 9,746 18,306
12 Months or Greater, Gross Unrealized Loss (500) (561)
Municipal debt securities    
Debt Securities, Available-for-Sale [Line Items]    
Less Than 12 Months, Fair Value 20,315 40,119
Less Than 12 Months, Gross Unrealized Losses (182) (712)
12 Months or Greater, Fair Value 8,271 3,336
12 Months or Greater, Gross Unrealized Loss $ (191) $ (156)