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Retirement Benefits (Schedule of Amount of Expense Associated with Defined Contribution Plans) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Compensation And Retirement Disclosure [Abstract]        
Company costs $ 10,132 $ 8,647 $ 30,582 $ 25,180