Other (Income) Expense, Net (Schedule of Other (Income) Expense, Net) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Nonoperating Income Expense [Abstract]
Equity interest in the earnings of the JV (Note 6)		$ (3,779)	$ (4,681)	$ (6,165)	$ (7,893)
Net gain on sales of assets and businesses	[1]	(1,354)	(10)	(1,942)	(13,557)
Rent income		(393)	(324)	(743)	(575)
Net (gain) loss on investments in deferred compensation program		(2,274)	3,021	(3,257)	1,776
Other components of net periodic pension and other postretirement benefit, excluding service cost and interest expense		(3,401)	(2,926)	(7,051)	(5,973)
Other		(130)	(143)	(296)	(266)
Other (income) expense, net		$ (11,331)	$ (5,063)	$ (19,454)	$ (26,488)

[1] Included in net gain on sale of assets and businesses for the six-months ended March 31, 2020 was the pre-tax gain on sale of Duarte real property in the amount of $13,522 recognized in the first quarter of fiscal year 2020.