Fair Value Measurements (Tables)

6 Months Ended

Mar. 31, 2025

Fair Value Disclosures [Abstract]

Schedule of Financial Assets, Temporary Equity, and Liabilities Not Measured at Fair Value in the Consolidated Balance Sheet

The tables below present our estimates of fair value of financial assets and liabilities that were not measured at fair value:

	Carrying Value		Estimated Fair Value
	March 31, 2025		March 31, 2025		Fair Value Measurement Using
(in thousands)					Level 1		Level 2		Level 3
Financial assets:
Promissory note receivable from Founders	$	16,921	$	16,921	$	—	$	—	$	16,921
Investments in unconsolidated affiliates	13,967		42,199		41,349		—		850
Financial liabilities:
2025 Convertible Notes	$	103,325	$	104,024	$	—	$	104,024	$	—
2029 Convertible Notes	224,723		338,089		—		338,089		—
2032 Senior Notes	292,465		305,117		—		305,117		—

	Carrying Value		Estimated Fair Value
	March 31, 2024		March 31, 2024		Fair Value Measurement Using
(in thousands)					Level 1		Level 2		Level 3
Financial assets:
Promissory note receivable due April 2024	$	1,268	$	1,268	$	—	$	—	$	1,268
Promissory note receivable from Founders	17,706		17,706		—		—		17,706
Investments in unconsolidated affiliates	13,162		41,135		40,285		—		850
Financial liabilities:
2024 Convertible Notes	$	34,347	$	34,303	$	—	$	34,303	$	—
2025 Convertible Notes	102,817		97,171		—		97,171		—
2029 Convertible Notes	223,756		268,893		—		268,893		—

	Carrying Value		Estimated Fair Value
	September 30, 2024		September 30, 2024		Fair Value Measurement Using
(in thousands)					Level 1		Level 2		Level 3
Financial assets:
Promissory note receivable from Founders	$	15,722	$	15,722	$	—	$	—	$	15,722
Investments in unconsolidated affiliates	13,329		42,496		41,646		—		850
Financial liabilities:
2025 Convertible Notes	$	103,072	$	100,401	$	—	$	100,401	$	—
2029 Convertible Notes	224,256		273,700		—		273,700		—