Income Taxes - Schedule of Calculation of the Effective Tax Rate (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2020	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income (loss) before income taxes	$ 9,555		$ 1,363		$ 12,888	$ (1,571)
Income tax provision	2,134		405		2,692	166
Net income (loss)	$ 7,421	$ 2,775	$ 958	$ (2,695)	$ 10,196	$ (1,737)
Effective tax rate	22.00%		30.00%		21.00%	(11.00%)