Other (Income) Expense, Net (Schedule of Other (Income) Expense, Net) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Nonoperating Income Expense [Abstract]
Equity interest in the earnings of the JV (Note 6)	$ (11,366)	$ (15,580)	$ (12,932)
Net (gain) loss on sales of assets and businesses	(4,452)	(23,598)	1,925
Rent income	(1,355)	(1,403)	(245)
Net gain on investments in deferred compensation program	(4,929)	(3,376)	(942)
Other components of net periodic pension and other postretirement benefit, excluding service cost and interest expense	(14,127)	(11,809)	(12,965)
Other	(264)	(400)	(810)
Other (income) expense, net	$ (36,493)	$ (56,166)	$ (25,969)