Equity - Schedule of Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Numerator for basic and diluted (loss) earnings per share attributable to common stockholders:
Net income attributable to common stockholders	$ 8,073	$ 6,351
Denominator:
Denominator for basic earnings per share—weighted average number of shares (in shares)	15,744,233	14,022,438
Effect of diluted securities (in shares)	200,000	200,000
Denominator for diluted earnings per share—adjusted weighted average number of shares and assumed conversions (in shares)	15,944,233	14,222,438
Basic earnings per share (in dollars per share)	$ 0.51	$ 0.45
Diluted earnings per share (in dollars per share)	$ 0.51	$ 0.45