Other (Income) Expense, Net (Schedule of Other (Income) Expense, Net) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Nonoperating Income Expense [Abstract]
Equity interest in the earnings of the JV (Note 6)	$ (2,688)	$ (931)	$ (8,853)	$ (8,824)
Net gain on sales of assets and businesses	(2,131)	2,545	(4,073)	(11,012)
Rent income	(268)	(520)	(1,011)	(1,095)
Net gain on investments in deferred compensation program	(1,850)	(3,456)	(5,107)	(1,680)
Other components of net periodic pension and other postretirement benefit, excluding service cost and interest expense	(3,541)	(2,911)	(10,592)	(8,884)
Other	123	(230)	(173)	(496)
Other (income) expense, net	$ (10,355)	$ (5,503)	$ (29,809)	$ (31,991)