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Stockholders' Equity (Summary of Activity in Common Stock and Treasury Stock Share) (Details) - shares
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
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 (13,060,000) (13,787,000)  
Balance, Treasury stock held for deferred compensation, shares (28,000) (45,000)  
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 (13,787,000) (13,070,000) (13,207,000)
Purchase of treasury stock, shares (864,000) (2,236,000) (1,060,000)
Sales of treasury stock, shares 1,460,000 1,360,000 1,009,000
Common shares issued for benefit plans, shares 131,000 159,000 188,000
Balance, Treasury Stock, shares (13,060,000) (13,787,000) (13,070,000)
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 (45,000) (55,000) (139,000)
Purchases of stock by deferred compensation, shares (1,000) (1,000) (2,000)
Distribution of stock from deferred compensation, shares 18,000 11,000 86,000
Balance, Treasury stock held for deferred compensation, shares (28,000) (45,000) (55,000)