Accrued Liabilities (Accrued Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Sep. 30, 2014	Jun. 30, 2014	Sep. 30, 2013
Accrued Liabilities
Salaries and other member benefits	$ 56,609	$ 95,031
Warranties	13,690	16,916	$ 16,796	$ 15,224
Interest payable	6,241	12,487
Current portion of acquired performance obligations and unfavorable contracts	8,417	16,432
Accrued retirement benefits	2,261	2,286
Deferred revenues	10,040	6,108
Taxes, other than income	6,535	8,557
Other	10,527	14,914
Accrued liabilities	$ 114,320	$ 172,731