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Pension Plans (Change in Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
AOCI Attributable to Parent, Before Tax [Roll Forward]    
Beginning Balance, value $ 885,436 $ 842,666
Ending Balance, value 874,589 885,436
Pension Plan [Member] | Foreign Plan [Member]    
AOCI Attributable to Parent, Before Tax [Roll Forward]    
Beginning Balance, value 24,738 38,667
Recognized during year - net actuarial (losses) (2,288) (3,380)
Occurring during year - settlement loss (9) 0
Occurring during year - net actuarial losses (gains) 5,312 (11,430)
Foreign exchange impact (726) 881
Ending Balance, value $ 27,027 $ 24,738