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Fair Value Measurements (Tables)
 6 Months Ended
Mar. 31, 2025
Fair Value Disclosures [Abstract]  
Schedule of Fair Value Measurements for Assets and Liabilities Measured at Fair Value on Recurring Basis
The following table presents information about the Company’s assets and liabilities measured at fair value on a recurring basis, and indicates the fair value hierarchy of the valuation techniques utilized by the Company:
March 31, 2025
Level 1Level 2Level 3Total
(in thousands)
Available-for-sale securities
U.S. government and agency securities$— $277,170 $— $277,170 
Commercial notes— 113,387 — 113,387 
Corporate debt securities— 521,143 — 521,143 
Total available-for-sale securities— 911,700 — 911,700 
Cash equivalents
Money market instruments137,535 — — 137,535 
Commercial notes— 28,908 — 28,908 
Total cash equivalents137,535 28,908 — 166,443 
Total financial assets$137,535 $940,608 $— $1,078,143 
September 30, 2024
Level 1Level 2Level 3Total
(in thousands)
Available-for-sale securities
U.S. government and agency securities$— $160,723 $— $160,723 
Commercial notes— 179,714 — 179,714 
Corporate debt securities— 237,839 — 237,839 
Total available-for-sale securities
— 578,276 — 578,276 
Cash equivalents
Money market instruments66,966 — — 66,966 
Total cash equivalents66,966 — — 66,966 
Total financial assets$66,966 $578,276 $— $645,242