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Other Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Sep. 30, 2017
Other Liabilities [Line Items]    
Net accrued retirement benefits, less amounts recognized within accrued liabilities $ 92,075 $ 52,211
Noncurrent portion of deferred income from JV formation 237,724 236,896
Total unrecognized tax benefits, net of offsetting adjustments 9,910 20,949
Noncurrent income taxes payable 23,920 0
Acquired unfavorable contracts 591 2,076
Deferred economic incentives 13,422 14,574
Other 12,363 14,165
Other liabilities 416,498 344,798
Loss Reserve On Contractual Lease Commitments [Member]    
Other Liabilities [Line Items]    
Loss reserve, noncurrent portion 2,966 $ 3,927
Cross Currency Interest Rate Contract [Member]    
Other Liabilities [Line Items]    
Derivative liability $ 23,527