Other (Income) Expense, Net (Schedule of Other (Income) Expense, Net) (Details) - USD ($) $ in Thousands		3 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Equity interest in the earnings of the JV (Note 6)		$ (3,212)	$ (1,465)
Net (gain) loss on sales of assets	[1]	(13,547)	79
Rent income		(251)	(67)
Net (gain) loss on investments in deferred compensation program		(1,244)	1,729
Other components of net periodic pension and other postretirement benefit, excluding service cost and interest expense		(3,047)	(3,243)
Other		(124)	(212)
Other (income) expense, net		(21,425)	$ (3,179)
Duarte Facility [Member]
Net (gain) loss on sales of assets		$ (13,522)

[1] Included in net (gain) loss on sale of assets for the first quarter of fiscal year 2020 was the pre-tax gain on sale of Duarte real property in the amount of $13,522.