Fair Value Measurements (Tables)

12 Months Ended

Sep. 30, 2023

Fair Value Disclosures [Abstract]

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 indicate the fair value hierarchy of the valuation techniques utilized by the Company:

	September 30, 2023
	Level 1		Level 2		Level 3		Total
	(in thousands)
Available-for-sale debt securities
U.S. government bonds	$	31,553	$	—	$	—	$	31,553
Municipal securities	—		7,093		—		7,093
Commercial notes	—		22,205		—		22,205
Corporate debt securities	—		231,884		—		231,884
Total available-for-sale debt securities	31,553		261,182		—		292,735
Money market instruments	347		—		—		347
Total financial assets	$	31,900	$	261,182	$	—	$	293,082

	September 30, 2022
	Level 1		Level 2		Level 3		Total
	(in thousands)
Held-to-maturity debt securities
U.S. government bonds	$	1,973	$	—	$	—	$	1,973
Municipal securities	—		—		—		—
Commercial notes	—		41,727		—		41,727
Corporate debt securities	—		271,333		—		271,333
Certificate of deposits	50,000		—		—		50,000
Total held-to-maturity debt securities	51,973		313,060		—		365,033
Money market instruments	39,262		—		—		39,262
Total financial assets	$	91,235	$	313,060	$	—	$	404,295