Other (Income) Expense, Net (Schedule of Other (Income) Expense, Net) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Equity interest in the earnings of the JV (Note 6)	$ (36,846)	$ (18,193)	$ (11,366)
Net loss (gain) on sales of assets and businesses	1,491	(1,775)	(4,452)
Rent income	(360)	(672)	(1,355)
Other components of net periodic pension and other postretirement benefit, excluding service cost and interest expense	(10,547)	(11,572)	(14,127)
Other	(764)	(774)	(264)
Other (income) expense, net	(50,291)	(26,691)	(36,493)
Gain (Loss) on Investments in Deferred Compensation Program [Member]
Net (gain) loss on investments in deferred compensation program	$ (3,265)	$ 6,295	$ (4,929)