Investments (Tables)

12 Months Ended

Sep. 30, 2025

Investments, Debt and Equity Securities [Abstract]

Schedule of Short-term, Long-term Investments and Marketable Securities

The Company’s investments consisted of the following:

	As of September 30, 2025
	(in thousands)
	Adjusted Basis		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Available-for-sale securities	$	689,882	$	2,956	$	(20)	$	692,818
Total current investments	$	689,882	$	2,956	$	(20)	$	692,818

	As of September 30, 2024
	(in thousands)
	Adjusted Basis		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Available-for-sale securities	$	577,465	$	837	$	(26)	$	578,276
Total current investments	$	577,465	$	837	$	(26)	$	578,276

Schedule of Contract Maturity of Available for Sale Securities

The following table summarizes the contract maturity of the available-for-sale securities as of:

	September 30, 2025		September 30, 2024
	(in thousands)
Within one year	$	224,328	$	578,276
After one to two years	468,490		—
After two to three years	—		—
Total	$	692,818	$	578,276