Leases - Other pertinent information (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2020 USD ($)
Leases [Abstract]
Operating cash flows used for operating leases	$ 37,758
Right-of-use assets obtained in exchange for lease obligations, Finance leases	6,083
Right-of-use assets obtained in exchange for lease obligations, Operating leases	$ 34,169