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Pension Plans (Change in Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
AOCI Attributable to Parent, Before Tax [Roll Forward]    
Beginning Balance, value $ 842,666 $ 860,171
Ending Balance, value 885,436 842,666
Pension Plan [Member] | Foreign Plan [Member]    
AOCI Attributable to Parent, Before Tax [Roll Forward]    
Beginning Balance, value 38,667 28,339
Recognized during year - net actuarial (losses) (3,380) (2,288)
Occurring during year - settlement loss 0 0
Occurring during year - net actuarial losses (gains) (11,430) 12,119
Foreign exchange impact 881 497
Ending Balance, value $ 24,738 $ 38,667