Annual report pursuant to Section 13 and 15(d)

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, 2023
Sep. 30, 2022
Sep. 30, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Percentage of liabilities that can be met plan assets 86.00%    
Investments in mutual funds $ 26.4    
UNITED STATES      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Employer contribution to defined contribution plans 34.1 $ 28.0 $ 17.3
Foreign Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Employer contribution to defined contribution plans $ 19.8 $ 23.7 $ 22.8