Stockholders' Equity (Summary of Activity in Common Stock and Treasury Stock Share) (Details) - shares	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Balance, Common Stock, shares			72,960,000
Balance, Treasury Stock, shares			(13,070,000)
Balance, Treasury stock held for deferred compensation, shares			(55,000)
Balance, Common Stock, shares	72,960,000		72,960,000
Balance, Treasury Stock, shares	(12,185,000)		(12,185,000)
Balance, Treasury stock held for deferred compensation, shares	(53,000)		(53,000)
Common Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Balance, Common Stock, shares	72,960,000	72,960,000	72,960,000	72,960,000
Balance, Common Stock, shares	72,960,000	72,960,000	72,960,000	72,960,000
Treasury Stock at Cost [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Balance, Common Stock, shares	(12,823,000)
Balance, Treasury Stock, shares		(13,460,000)	(13,070,000)	(13,207,000)
Sales of treasury stock, shares	479,000	251,000	726,000	270,000
Purchase of treasury stock, shares				(274,000)
Common shares issued for benefit plans, shares	159,000	187,000	159,000	189,000
Balance, Common Stock, shares	(12,185,000)		(12,185,000)
Balance, Treasury Stock, shares	(12,185,000)	(13,022,000)	(12,185,000)	(13,022,000)
Treasury Stock Held for Deferred Compensaton [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Balance, Common Stock, shares	(54,000)
Balance, Treasury stock held for deferred compensation, shares		(122,000)	(55,000)	(139,000)
Purchases of stock by deferred compensation, shares			(1,000)	(1,000)
Distribution of stock from deferred compensation, shares	1,000	55,000	3,000	73,000
Balance, Common Stock, shares	(53,000)		(53,000)
Balance, Treasury stock held for deferred compensation, shares	(53,000)	(67,000)	(53,000)	(67,000)