Revenue (Schedule of Revenue Recognition Time) (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 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
Disaggregation of Revenue [Line Items]
Net sales	$ 531,264	$ 523,826	$ 720,220	$ 720,355	$ 736,537		$ 752,005		$ 758,844		$ 652,811		$ 2,495,665	$ 2,900,197	$ 2,325,873
Point In Time [Member]
Disaggregation of Revenue [Line Items]
Net sales													1,182,974	1,396,261
Over Time [Member]
Disaggregation of Revenue [Line Items]
Net sales													1,312,691	1,503,936
Aerospace [Member]
Disaggregation of Revenue [Line Items]
Net sales	336,308	306,494	474,236	473,925	505,904		498,775		482,954		392,887		1,590,963	1,880,520
Aerospace [Member] | Point In Time [Member]
Disaggregation of Revenue [Line Items]
Net sales													590,817	762,042
Aerospace [Member] | Over Time [Member]
Disaggregation of Revenue [Line Items]
Net sales													1,000,146	1,118,478
Industrial [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 194,956	$ 217,332	$ 245,984	$ 246,430	$ 230,633	[1]	$ 253,230	[1]	$ 275,890	[1]	$ 259,924	[1]	904,702	1,019,677
Industrial [Member] | Point In Time [Member]
Disaggregation of Revenue [Line Items]
Net sales													592,157	634,219
Industrial [Member] | Over Time [Member]
Disaggregation of Revenue [Line Items]
Net sales													$ 312,545	$ 385,458

[1] Industrial segment earnings for the first through third quarters of fiscal year 2019 include pre-tax non-cash charges of $9,511, $8,985, $2,604, respectively.  These costs are associated with the purchase accounting impacts related to the revaluation of the L’Orange inventory recognized in cost of goods sold and the amortization of the backlog intangible.