Property, Plant, and Equipment (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Net (gain) loss on sales of assets	[1]	$ 588	$ 13,547
Impairment of assets held for sale			37,902
Duarte Facility [Member]
Property, Plant and Equipment [Line Items]
Net (gain) loss on sales of assets			$ (13,522)
Disposal Groups [Member]
Property, Plant and Equipment [Line Items]
Impairment of assets held for sale		37,902
Disposal Groups [Member] | Plant, Property and Equipment [Member]
Property, Plant and Equipment [Line Items]
Impairment of assets held for sale		$ 13,421

[1] Included in net gain on sale of assets and businesses for the three-months ended December 31, 2019 was the pre-tax gain on sale of Duarte real property in the amount of $13,522.