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Fair Value Assets - Measured on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Sep. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents, fair value $ 642,997 $ 437,273
Equity Securities, FV-NI 15,693 8,580
Equity Securities, FV-NI, Current 0 0
Equity Securities, FV-NI, Noncurrent 15,693 8,580
Investments, Fair Value Disclosure 658,690 445,853
Short-term investments 0 0
Long-term investments 15,693 8,580
Money Market Funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents, fair value 642,997 437,273
Fair Value, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities, FV-NI 15,693 8,580
Equity Securities, FV-NI, Current 0 0
Equity Securities, FV-NI, Noncurrent 15,693 8,580
Fair Value, Recurring [Member] | Level 1 | Money Market Funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents, fair value $ 642,997 $ 437,273