Stockholders' Equity (Summary of Activity in Common Stock and Treasury Stock Share) (Details) - shares	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
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	(13,787,000)	(13,070,000)
Balance, Treasury stock held for deferred compensation, shares	(45,000)	(55,000)
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
Balance, Common Stock, shares	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	(13,070,000)	(13,207,000)	(9,702,000)
Purchase of treasury stock, shares	(2,236,000)	(1,060,000)	(4,123,000)
Sales of treasury stock, shares	1,360,000	1,009,000	468,000
Common shares issued for benefit plans, shares	159,000	188,000	150,000
Balance, Treasury Stock, shares	(13,787,000)	(13,070,000)	(13,207,000)
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	(55,000)	(139,000)	(167,000)
Purchases of stock by deferred compensation, shares	(1,000)	(2,000)	(3,000)
Distribution of stock from deferred compensation, shares	11,000	86,000	31,000
Balance, Treasury stock held for deferred compensation, shares	(45,000)	(55,000)	(139,000)