Accrued Liabilities (Accrued Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Accrued Liabilities
Salaries and other member benefits	$ 90,472	$ 95,031
Warranties	13,741	16,916	$ 15,224	$ 15,742
Interest payable	12,526	12,487
Current portion of acquired performance obligations and unfavorable contracts	6,651	16,432
Accrued retirement benefits	2,481	2,286
Deferred revenues	10,004	6,108
Taxes, other than income	8,723	8,557
Other	11,338	14,914
Accrued liabilities	$ 155,936	$ 172,731