Other Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Other Liabilities
Net accrued retirement benefits, less amounts recognized within accrued liabilities	$ 38,850	$ 39,956
Total unrecognized tax benefits, net of offsetting adjustments	14,707	20,343
Acquired performance obligations and unfavorable contracts	12,792	23,951
Deferred economic incentives	18,408	8,266
Other	16,454	12,994
Other liabilities	$ 101,211	$ 105,510