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Other Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Other Liabilities [Line Items]
Net accrued retirement benefits, less amounts recognized within accrued liabilities	$ 53,234	$ 52,211
Noncurrent portion of deferred income from JV formation	239,275	236,896
Total unrecognized tax benefits, net of offsetting adjustments	20,684	20,949
Noncurrent income taxes payable	23,920	0
Acquired unfavorable contracts	1,149	2,076
Deferred economic incentives	13,801	14,574
Other	10,850	14,165
Other liabilities	366,146	344,798
Loss Reserve On Contractual Lease Commitments [Member]
Other Liabilities [Line Items]
Loss reserve	$ 3,233	$ 3,927

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- Definition

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due beyond one year or the operating cycle, whichever is longer. Alternate captions include income taxes payable, noncurrent.

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Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.

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Amount of liability, recognized in statement of financial position, for pension, other postretirement and postemployment benefits, classified as noncurrent.

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Carrying amount as of the balance sheet date of known and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid after one year or beyond the next operating cycle, if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

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The carrying amount, as of the balance sheet date, of noncurrent liabilities recognized in the balance sheet that are associated with unfavorable contracts assumed in an acquisition of an entity as well as commitments for the acquired entity to continue to provide services to the seller of the acquired entity, for which the company will be paid by the seller of the acquired entity. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer).

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Aggregate carrying amount, as of the balance sheet date, of economic incentives from various state and local taxing authorities not included in income tax expense related to capital expansion projects. Such amounts are initially recorded as deferred credits and will be recognized as a reduction to expense over the economic lives of the related capital expansion projects.

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Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet or individually material enough to disclose separately. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer).

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