Equity Method and Other Investments - Summarized Financial Information - Statement of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]
Total revenue	$ 104,667	$ 74,659	$ 48,047
Gross profit	41,241	27,355	16,327
Income (loss) from continuing operations	26,340	6,731	(1,074)
Net income (loss)	$ 19,451	$ 2,374	$ (2,452)