v3.26.1
Retirement Benefits (Schedule of Net Periodic Benefit Costs) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Defined Benefit Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 532 $ 596 $ 1,603 $ 1,746
Interest cost 2,556 2,484 7,675 7,366
Expected return on plan assets (3,255) (3,387) (9,766) (10,101)
Amortization of: Net actuarial loss (gain) (84) (63) (255) (176)
Amortization of: Prior service cost 134 197 404 589
Net periodic retirement pension (benefit) cost (117) (173) (339) (576)
Contributions paid 271 281 1,383 1,155
Other Postretirement Benefit Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 177 179 532 538
Amortization of: Net actuarial loss (gain) (113) (110) (338) (331)
Net periodic retirement pension (benefit) cost 64 69 194 207
Contributions paid - other postretirement plans 370 398 1,161 1,192
United States [Member] | Defined Benefit Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 199 229 597 688
Interest cost 1,769 1,719 5,309 5,156
Expected return on plan assets (2,618) (2,748) (7,853) (8,244)
Amortization of: Net actuarial loss (gain) 34 43 102 128
Amortization of: Prior service cost 128 191 386 572
Net periodic retirement pension (benefit) cost (488) (566) (1,459) (1,700)
Other Countries [Member] | Defined Benefit Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 333 367 1,006 1,058
Interest cost 787 765 2,366 2,210
Expected return on plan assets (637) (639) (1,913) (1,857)
Amortization of: Net actuarial loss (gain) (118) (106) (357) (304)
Amortization of: Prior service cost 6 6 18 17
Net periodic retirement pension (benefit) cost 371 393 1,120 1,124
Contributions paid $ 271 $ 281 $ 1,383 $ 1,155