Fair Value Measurements (Tables)

12 Months Ended

Sep. 30, 2022

Fair Value Disclosures [Abstract]

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

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

	Carrying Value		Estimated Fair Value
	September 30, 2022		September 30, 2022		Fair Value Measurement Using
(in thousands)					Level 1		Level 2		Level 3
Financial assets:
2.89% promissory note receivable due April 2024	$	1,215	$	1,215	$	—	$	—	$	1,215
Investments in unconsolidated affiliates	37,733		40,279		40,279		—		—
Other investments	24,220		24,220		—		—		24,220
Financial liabilities:
2024 Convertible Notes	$	142,575	$	157,727	$	—	$	157,727	$	—
2025 Convertible Notes	170,328		147,488		—		147,488		—

	Carrying Value		Estimated Fair Value
	September 30, 2021		September 30, 2021		Fair Value Measurement Using
(in thousands)					Level 1		Level 2		Level 3
Financial assets:
2.89% promissory note receivable due April 2024	$	1,181	$	1,181	$	—	$	—	$	1,181
Investments in unconsolidated affiliates	37,724		48,954		41,638		—		7,316
Financial liabilities:
2024 Convertible Notes	$	123,543	$	153,281	$	—	$	153,281	$	—
2025 Convertible Notes	140,643		155,250		—		155,250		—