Investments (Tables)

6 Months Ended

Mar. 31, 2025

Investments, Debt and Equity Securities [Abstract]

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

The Company’s investments consisted of the following:

	As of March 31, 2025
	(in thousands)
	Adjusted Basis		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Available-for-sale securities	$	910,744	$	1,063	$	(107)	$	911,700
Total current investments	$	910,744	$	1,063	$	(107)	$	911,700

	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:

	March 31, 2025		September 30, 2024
	(in thousands)
Within one year	$	422,082	$	578,276
After one to two years	301,085		—
After two to three years	188,533		—
Total	$	911,700	$	578,276