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Retirement Benefits (Schedule of Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Defined Benefit Pension Plan [Member]      
Changes in projected benefit obligation:      
Projected benefit obligation at beginning of year $ 218,302 $ 194,485  
Plan amendment   1,121  
Service cost 2,349 2,019  
Interest cost 9,858 10,811  
Net actuarial (gains) losses (6,971) 17,377  
Contribution by participants 12 12  
Benefits paid (12,930) (12,657)  
Foreign currency exchange rate changes 1,615 5,134  
Projected benefit obligation at end of year 212,235 218,302 $ 194,485
Changes in fair value of plan assets:      
Fair value of plan assets at beginning of year 237,393 206,145  
Actual return on plan assets 9,465 37,248  
Contributions by the Company 1,423 2,038  
Contribution by participants 12 12  
Benefits paid (12,930) (12,657)  
Foreign currency exchange rate changes (222) 4,607  
Fair value of plan assets at end of year 235,141 237,393 206,145
Net over/(under) funded status at end of year 22,906 19,091  
Other Postretirement Benefits Plan [Member]      
Changes in projected benefit obligation:      
Projected benefit obligation at beginning of year 15,203 15,336  
Service cost     1
Interest cost 717 902 904
Net actuarial (gains) losses (278) 597  
Contribution by participants 753 834  
Benefits paid (2,202) (2,466)  
Projected benefit obligation at end of year 14,193 15,203 15,336
Changes in fair value of plan assets:      
Contributions by the Company 1,449 1,632  
Contribution by participants 753 834  
Benefits paid (2,202) (2,466)  
Net over/(under) funded status at end of year (14,193) (15,203)  
United States [Member] | Defined Benefit Pension Plan [Member]      
Changes in projected benefit obligation:      
Projected benefit obligation at beginning of year 140,955 127,222  
Plan amendment   1,121  
Service cost 917 775  
Interest cost 6,875 7,598  
Net actuarial (gains) losses (6,027) 13,249  
Benefits paid (9,112) (9,010)  
Projected benefit obligation at end of year 133,608 140,955 127,222
Changes in fair value of plan assets:      
Fair value of plan assets at beginning of year 179,917 155,370  
Actual return on plan assets 7,778 33,382  
Contributions by the Company   175  
Benefits paid (9,112) (9,010)  
Fair value of plan assets at end of year 178,583 179,917 155,370
Net over/(under) funded status at end of year 44,975 38,962  
Foreign Plan | Defined Benefit Pension Plan [Member]      
Changes in projected benefit obligation:      
Projected benefit obligation at beginning of year 77,347 67,263  
Service cost 1,432 1,244  
Interest cost 2,983 3,213  
Net actuarial (gains) losses (944) 4,128  
Contribution by participants 12 12  
Benefits paid (3,818) (3,647)  
Foreign currency exchange rate changes 1,615 5,134  
Projected benefit obligation at end of year 78,627 77,347 67,263
Changes in fair value of plan assets:      
Fair value of plan assets at beginning of year 57,476 50,775  
Actual return on plan assets 1,687 3,866  
Contributions by the Company 1,423 1,863  
Contribution by participants 12 12  
Benefits paid (3,818) (3,647)  
Foreign currency exchange rate changes (222) 4,607  
Fair value of plan assets at end of year 56,558 57,476 $ 50,775
Net over/(under) funded status at end of year $ (22,069) $ (19,871)