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Property, Plant, and Equipment (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2021 | Mar. 31, 2020 | Sep. 30, 2020
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Net (gain) loss on sales of assets | [1] | $ 1,354 | $ 10 |  | $ 1,942 | $ 13,557 |
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) |  | $ 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 six-months ended March 31, 2020 was the pre-tax gain on sale of Duarte real property in the amount of $13,522 recognized in the first quarter of fiscal year 2020.

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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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