Accrued Liabilities (Accrued Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Salaries and other member benefits	$ 47,677	$ 87,197
Warranties	15,528	15,993	$ 13,370	$ 13,741
Interest payable	5,789	9,071
Current portion of acquired performance obligations and unfavorable contracts	2,910	2,910
Accrued retirement benefits	2,503	2,505
Current portion of deferred income from JV formation (Note 4)	6,452	6,552
Deferred revenues	7,577	5,779
Taxes, other than income	9,289	14,580
Other	16,258	10,200
Accrued liabilities	115,823	156,627
Loss Reserve On Contractual Lease Commitments [Member]
Current portion of loss reserve	$ 1,840	$ 1,840