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Earnings per Share (Detail) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Earnings Per Share [Abstract]        
Average common shares outstanding (shares) 287,293 289,518 288,411 289,941
Dilutive share equivalents from share-based plans (shares) 444 826 782 1,268
Average common and common equivalent shares outstanding - assuming dilution (shares) 287,737 290,344 289,193 291,209
Share Based Compensation        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Share equivalents excluded from the diluted shares outstanding calculation (shares) 2,734 1,155 2,734 545