Annual report [Section 13 and 15(d), not S-K Item 405]

Employee Benefit Plans And Deferred Compensation - Narrative (Details)

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Employee Benefit Plans And Deferred Compensation - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Percentage of liabilities that can be met plan assets 92.00%    
Investments in mutual funds $ 40.6    
United States      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Employer contribution to defined contribution plans 37.3 $ 36.7 $ 34.1
Foreign Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Employer contribution to defined contribution plans $ 13.5 $ 20.4 $ 19.8