Marketable Securities (Tables)

6 Months Ended

Mar. 31, 2026

Investments, Debt and Equity Securities [Abstract]

The following is a summary of the amortized cost and the fair value, including accrued interest receivable as well as unrealized gains (losses) on the Company's short-term and long-term marketable securities as of March 31, 2026 and September 30, 2025 (in thousands):


	Amortized Cost		Gross Unrealized Losses		Gross Unrealized Gains		Fair Value
March 31, 2026:
U.S. Treasury securities and obligations of U.S. government agencies	$	240,421	$	(420)	$	22	$	240,023
Bank certificates of deposit	1,285		—		—		1,285
Corporate securities	68,610		(325)		3		68,288
Municipal securities	14,675		—		44		14,719
	$	324,991	$	(745)	$	69	$	324,315
September 30, 2025:
U.S. Treasury securities and obligations of U.S. government agencies	$	245,691	$	(94)	$	168	$	245,765
Bank certificates of deposit	1,640		—		1		1,641
Corporate securities	4,199		—		—		4,199
Municipal securities	11,048		—		69		11,117
	$	262,578	$	(94)	$	238	$	262,722

Schedule of Contractual Maturity

The amortized cost and fair value of the marketable securities by contractual maturities as of March 31, 2026 are presented below (in thousands):


	Amortized Cost		Fair Value
Due in one year or less	$	146,507	$	146,484
Due after one year through five years	174,499		173,846
Due after ten years	3,985		3,985
Total marketable securities	$	324,991	$	324,315