Fair Value Measurements (Tables)

6 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Financial assets (liabilities) that are measured at fair value on a recurring basis

The tables below present our financial assets (liabilities) that were carried and measured at fair value on a recurring basis:

Financial Assets (Liabilities)	Balance Sheet Location	March 31, 2018			March 31, 2017			September 30, 2017
		(in thousands)
2019 Convertible Notes Hedges — Level 2	Other assets, net	$	16,042		$	15,138		$	6,591
2019 Convertible Notes Embedded Derivative — Level 2	Long-term debt, net	(16,042		)	(15,138		)	(6,591		)

Financial assets, temporary equity, 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 on a recurring basis:

	Carrying Value		Estimated Fair Value
	March 31, 2018		March 31, 2018		Fair Value Measurement Using
					Level 1		Level 2		Level 3
	(in thousands)
Financial assets:
Notes receivable, net	$	56,751	$	65,091	$	—	$	—	$	65,091
Investment in unconsolidated affiliate	46,509		46,926		46,926		—		—
Financial liabilities:
2019 Convertible Notes	$	182,296	$	206,856	$	—	$	206,856	$	—
2024 Convertible Notes	103,287		212,060		—		212,060		—

	Carrying Value		Estimated Fair Value
	March 31, 2017		March 31, 2017		Fair Value Measurement Using
					Level 1		Level 2		Level 3
	(in thousands)
Financial assets:
Notes receivable, net	$	70,297	$	71,921	$	—	$	—	$	71,921
Investment in unconsolidated affiliate	38,334		37,101		37,101		—		—
Financial liabilities:
2019 Convertible Notes	$	203,464	$	213,417	$	—	$	213,417	$	—
Term Loan Facility	48,122		50,403		—		—		50,403

	Carrying Value		Estimated Fair Value
	September 30, 2017		September 30, 2017		Fair Value Measurement Using
					Level 1		Level 2		Level 3
	(in thousands)
Financial assets:
Notes receivable, net	$	60,975	$	74,262	$	—	$	—	$	74,262
Investment in unconsolidated affiliate	43,319		49,057		49,057		—		—
Financial liabilities:
2019 Convertible Notes	$	177,346	$	193,811	$	—	$	193,811	$	—
2024 Convertible Notes	100,870		175,016		—		175,016		—