Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 3,244,477	$ 3,349,140
Less accumulated depreciation	(1,759,669)	(1,578,624)
Property and equipment, net	1,484,808	1,770,516
Land
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	39,572	44,142
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	586,551	942,129
Machinery, equipment, and other
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 2,618,354	$ 2,362,869