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Fair Value Measurement (Tables)
 6 Months Ended
Mar. 31, 2025
Fair Value Disclosures [Abstract]  
Summary of Company's Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis
As of March 31, 2025, financial assets measured and recognized at fair value are as follows:

(in thousands)Level 1Level 2Level 3Fair value
Assets    
Money market funds$168,394 $— $— $168,394 
U.S. government treasury bills46,710 — — 46,710 
Total financial assets$215,104 $— $— $215,104 
As of September 30, 2024, financial assets measured and recognized at fair value are as follows:

(in thousands)Level 1Level 2Level 3Fair value
Assets    
Money market funds$199,858 $— $— $199,858 
U.S. government treasury bills50,083— — 50,083
Total financial assets$249,941 $— $— $249,941