Acquisitions - Pro forma Information (Details) - Bajio - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2021	Jun. 30, 2021
Business Acquisition [Line Items]
Revenue	$ 180,854	$ 558,426
Net (loss) income	$ (2,475)	$ 6,775
Basic (loss) earnings per common share (in dollars per share)	$ (0.04)	$ 0.12
Diluted (loss) earnings per common share (in dollars per share)	$ (0.04)	$ 0.12