Accrued Liabilities (Accrued Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Salaries and other member benefits	$ 47,868	$ 90,472
Warranties	13,370	13,741	$ 15,876	$ 16,916
Interest payable	6,100	12,526
Current portion of acquired performance obligations and unfavorable contracts	5,891	6,651
Accrued retirement benefits	2,481	2,481
Deferred revenues	9,025	10,004
Taxes, other than income	8,637	8,723
Other	12,727	11,338
Accrued liabilities	107,939	155,936
Loss Reserve On Contractual Lease Commitments [Member]
Current portion of loss reserve	$ 1,840	$ 0