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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, 2020
Sep. 30, 2019
Sep. 30, 2018
Defined Benefit Pension Plan [Member]      
Changes in projected benefit obligation:      
Projected benefit obligation at beginning of year $ 297,130 $ 253,517  
Plan amendment   601  
Service cost 4,524 3,487 $ 2,767
Interest cost 6,868 8,290 7,530
Net actuarial losses (gains) 2,970 46,015  
Contribution by participants 100 9  
Benefits paid (10,103) (9,294)  
Settlements (476)    
Foreign currency exchange rate changes 6,610 (5,495)  
Projected benefit obligation at end of year 307,623 297,130 253,517
Changes in fair value of plan assets:      
Fair value of plan assets at beginning of year 234,133 227,722  
Actual return on plan assets 38,153 16,448  
Contributions by the Company 2,272 1,697  
Contribution by participants 100 9  
Benefits paid (10,103) (9,294)  
Settlements (476)    
Foreign currency exchange rate changes 2,630 (2,449)  
Fair value of plan assets at end of year 266,709 234,133 227,722
Net over/(under) funded status at end of year (40,914) (62,997)  
United States [Member] | Defined Benefit Pension Plan [Member]      
Changes in projected benefit obligation:      
Projected benefit obligation at beginning of year 175,595 150,032  
Service cost 1,659 1,451 1,643
Interest cost 5,590 6,384 6,004
Net actuarial losses (gains) 7,811 23,841  
Contribution by participants 91    
Benefits paid (6,669) (6,113)  
Projected benefit obligation at end of year 184,077 175,595 150,032
Changes in fair value of plan assets:      
Fair value of plan assets at beginning of year 170,556 165,342  
Actual return on plan assets 37,577 11,327  
Contribution by participants 91    
Benefits paid (6,669) (6,113)  
Fair value of plan assets at end of year 201,555 170,556 165,342
Net over/(under) funded status at end of year 17,478 (5,039)  
Foreign Plan | Defined Benefit Pension Plan [Member]      
Changes in projected benefit obligation:      
Projected benefit obligation at beginning of year 121,535 103,485  
Plan amendment   601  
Service cost 2,865 2,036 1,124
Interest cost 1,278 1,906 1,526
Net actuarial losses (gains) (4,841) 22,174  
Contribution by participants 9 9  
Benefits paid (3,434) (3,181)  
Settlements (476)    
Foreign currency exchange rate changes 6,610 (5,495)  
Projected benefit obligation at end of year 123,546 121,535 103,485
Changes in fair value of plan assets:      
Fair value of plan assets at beginning of year 63,577 62,380  
Actual return on plan assets 576 5,121  
Contributions by the Company 2,272 1,697  
Contribution by participants 9 9  
Benefits paid (3,434) (3,181)  
Settlements (476)    
Foreign currency exchange rate changes 2,630 (2,449)  
Fair value of plan assets at end of year 65,154 63,577 62,380
Net over/(under) funded status at end of year (58,392) (57,958)  
Other Postretirement Benefit Plans [Member]      
Changes in projected benefit obligation:      
Projected benefit obligation at beginning of year 26,671 27,985  
Service cost 2 5  
Interest cost 782 1,154  
Net actuarial losses (gains) (313) (373)  
Contribution by participants 1,088 1,192  
Benefits paid (2,785) (3,292)  
Projected benefit obligation at end of year 25,445 26,671 $ 27,985
Changes in fair value of plan assets:      
Contributions by the Company 1,697 2,100  
Contribution by participants 1,088 1,192  
Benefits paid (2,785) (3,292)  
Net over/(under) funded status at end of year $ (25,445) $ (26,671)