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Cash, Cash Equivalent and Investments (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Mar. 31, 2025
Sep. 30, 2024
Cash and Cash Equivalents [Line Items]    
Cash and cash equivalents $ 210,437 $ 226,316
Short term investments, Amortized cost 46,687 49,964
Gross unrealized gains 23 119
Gross unrealized losses 0 0
U.S. government treasury bills 46,710 50,083
Equity securities, FV-NI, cost 1,525 1,525
Equity securities, FV-NI, unrealized gain 0 0
Equity securities, FV-NI, unrealized loss 0 0
Equity securities, FV-NI 1,525 1,525
Total cash, cash equivalents and investments, amortized cost 258,649 277,805
Cash, cash equivalents and investments, fair value 258,672 277,924
U.S. government treasury bills    
Cash and Cash Equivalents [Line Items]    
Short term investments, Amortized cost 46,687 49,964
Gross unrealized gains 23 119
Gross unrealized losses 0 0
U.S. government treasury bills 46,710 50,083
Cash    
Cash and Cash Equivalents [Line Items]    
Cash and cash equivalents 42,043 26,458
Money market funds    
Cash and Cash Equivalents [Line Items]    
Cash and cash equivalents $ 168,394 $ 199,858