Operating Leases - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2020	Jun. 30, 2020
Leases [Abstract]
Operating lease expense	$ 1,100	$ 3,400
Operating lease payments	1,100	3,500
Increase (decrease) operating leases right-of-use asset	30	3,100
Increase (decrease) operating leases liability	$ 30	$ 3,100