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Supplemental Quarterly Financial Data (Narrative) (Details) - USD ($) $ in Thousands				3 Months Ended							12 Months Ended
		Aug. 11, 2020	Dec. 30, 2019	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Net (gain) loss on sales of assets	[1]										$ 23,598	$ (1,925)	$ 1,106
Non-cash impairment charge						$ 37,902
Gain on cross-currency interest rate swaps, net					$ 30,481						30,481
Swap termination fee					3,000
Transition tax								$ 10,588
Asset impairment charges							$ 12,601				37,902
Non-cash impairment charge						37,902
Restructuring charges											22,216		17,013
Senvion [Member]
Asset impairment charges							12,601
Duarte Plant Relocation [Member]
Duarte move related costs							3,930	7,035	$ 9,161	$ 6,963
Restructuring charges													$ 17,013
Industrial [Member] | Business Acquisition, Acquiree - L'Orange [Member]
Non cash acquisition related charges								2,604	8,985	9,511
Unallocated Corporate [Member]
Asset impairment charges							12,601
Unallocated Corporate [Member] | Business Acquisition, Acquiree - L'Orange [Member]
Restructuring charges				$ 3,176	$ 19,040
Aerospace [Member] | Duarte Plant Relocation [Member]
Duarte move related costs							$ 3,930	$ 7,035	$ 9,161	$ 6,963
Duarte Facility [Member]
Net (gain) loss on sales of assets		$ 8,801	$ 13,522	$ 8,801		$ 13,522					$ (22,323)
[1] Included in net (gain) loss on sale of assets and businesses for the fiscal year ended September 30, 2020 was the pre-tax gain on sale of Duarte real property in the amount of $22,323, the pre-tax gain on sale of the Loveland campus of $2,330, and a net loss on divestiture of the disposal group of $515.

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