Leases - Other pertinent information (Details) $ in Thousands	6 Months Ended
	Mar. 31, 2020 USD ($)
Leases [Abstract]
Operating cash flows used for operating leases	$ 18,223
Right-of-use assets obtained in exchange for lease obligations, Finance leases	4,150
Right-of-use assets obtained in exchange for lease obligations, Operating leases	$ 13,854