Stockholders' Equity (Summary of Activity in Common Stock and Treasury Stock Shares) (Details) - shares	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Balance, Common Stock, shares			72,960,000
Balance, Treasury Stock, shares			(13,787,000)
Balance, Treasury stock held for deferred compensation, shares			(45,000)
Balance, Common Stock, shares	72,960,000		72,960,000
Balance, Treasury Stock, shares	(13,380,000)		(13,380,000)
Balance, Treasury stock held for deferred compensation, shares	(30,000)		(30,000)
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, Treasury Stock, shares	(13,607,000)	(12,823,000)	(13,787,000)	(13,070,000)
Sales of treasury stock, shares	344,000	479,000	725,000	726,000
Purchase of treasury stock, shares	(243,000)		(449,000)
Common shares issued for benefit plans, shares	126,000	159,000	131,000	159,000
Balance, Treasury Stock, shares	(13,380,000)	(12,185,000)	(13,380,000)	(12,185,000)
Treasury Stock Held for Deferred Compensation [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Balance, Treasury stock held for deferred compensation, shares	(31,000)	(54,000)	(45,000)	(55,000)
Purchases of stock by deferred compensation, shares			(1,000)	(1,000)
Distribution of stock from deferred compensation, shares	1,000	1,000	16,000	3,000
Balance, Treasury stock held for deferred compensation, shares	(30,000)	(53,000)	(30,000)	(53,000)