Fair Value Measurements (Tables)

12 Months Ended

Sep. 30, 2021

Fair Value Disclosures [Abstract]

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, 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		—

	Carrying Value		Estimated Fair Value
	September 30, 2020		September 30, 2020		Fair Value Measurement Using
(in thousands)					Level 1		Level 2		Level 3
Financial assets:
2.89% promissory note receivable due April 2024	$	1,148	$	1,148	$	—	$	—	$	1,148
Investments in unconsolidated affiliates	32,458		32,597		24,833		—		7,764
Financial liabilities:
2024 Convertible Notes	$	117,193	$	129,979	$	—	$	129,979	$	—
2025 Convertible Notes	133,164		137,569		—		137,569		—
8.5% unsecured debt due 2024	872		872		—		—		872