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Property, Plant, and Equipment (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended
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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.

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- Definition Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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