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Fair Value Measurements - Schedule of Financial Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]    
Cash equivalents, fair value $ 186,499 $ 287,932
Cost or amortized cost 200,610 422,699
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (229) (1,787)
Fair value 200,381 420,912
Debt Securities, Available-for-sale, Current 13,109 126,554
Debt Securities, Available-for-sale, Noncurrent 773 6,426
Equity Securities, FV-NI 5,114 3,118
Equity Securities, FV-NI, Current 0 0
Equity Securities, FV-NI, Noncurrent 5,114 3,118
Available-for-sale Securities 205,495 424,030
Available-for-sale Securities, Current 13,109 126,554
Long-term investments 5,887 9,544
Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]    
Equity Securities, FV-NI 5,114 3,118
Equity Securities, FV-NI, Current 0 0
Equity Securities, FV-NI, Noncurrent 5,114 3,118
Money Market Funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]    
Cash equivalents, fair value 186,499 276,294
Money Market Funds | Fair Value, Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]    
Cash equivalents, fair value 186,499 276,294
Corporate Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]    
Cost or amortized cost 7,271 50,828
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (144) (950)
Corporate Debt Securities [Member] | Fair Value, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]    
Cash equivalents, fair value   912
Fair value 7,127 49,878
Debt Securities, Available-for-sale, Current 6,354 44,356
Debt Securities, Available-for-sale, Noncurrent 773 4,610
Municipal Bonds And Notes [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]    
Cost or amortized cost 2,156 5,018
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (31) (102)
Municipal Bonds And Notes [Member] | Fair Value, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]    
Fair value 2,125 4,916
Debt Securities, Available-for-sale, Current 2,125 3,812
Debt Securities, Available-for-sale, Noncurrent 0 1,104
U.S. Government Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]    
Cost or amortized cost 2,899 84,734
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (34) (660)
U.S. Government Securities | Fair Value, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]    
Cash equivalents, fair value   10,120
Fair value 2,865 84,074
Debt Securities, Available-for-sale, Current 2,865 73,954
Debt Securities, Available-for-sale, Noncurrent 0 0
U.S. Government Agency Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]    
Cost or amortized cost 1,785 5,825
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (20) (75)
U.S. Government Agency Securities | Fair Value, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]    
Cash equivalents, fair value   606
Fair value 1,765 5,750
Debt Securities, Available-for-sale, Current 1,765 4,432
Debt Securities, Available-for-sale, Noncurrent $ 0 $ 712