Other (Income) Expense, Net (Schedule of Other (Income) Expense, Net) (Details) - USD ($) $ in Thousands		3 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Nonoperating Income Expense [Abstract]
Equity interest in the earnings of the JV (Note 6)		$ (2,386)	$ (3,212)
Net gain on sales of assets and businesses	[1]	(588)	(13,547)
Rent income		(350)	(251)
Net gain on investments in deferred compensation program		(983)	(1,244)
Other components of net periodic pension and other postretirement benefit, excluding service cost and interest expense		(3,650)	(3,047)
Other		(166)	(124)
Other (income) expense, net		$ (8,123)	$ (21,425)

[1] Included in net gain on sale of assets and businesses for the three-months ended December 31, 2019 was the pre-tax gain on sale of Duarte real property in the amount of $13,522.