Leases - Other Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases
Operating lease - cash paid for fixed payments	$ 4,800	$ 4,500
Finance lease - cash paid for finance lease liabilities	18
Right-of-use assets obtained in exchange for new finance lease liabilities	12,600
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 200	$ 9,600