Leases - Operating Lease Expense (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2020 USD ($)
Lease, Cost [Abstract]
Operating lease costs	$ 9,288
Amortization of assets	1,246
Interest on lease liabilities	95
Total finance lease costs	1,341
Variable lease cost	1,951
Short-term lease costs	526
Total lease costs	$ 13,106