Other Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Sep. 30, 2014
Other Liabilities
Net accrued retirement benefits, less amounts recognized within accrued liabilities	$ 38,039	$ 38,850
Total unrecognized tax benefits, net of offsetting adjustments	16,013	14,707
Acquired performance obligations and unfavorable contracts	4,712	12,792
Deferred economic incentives	19,107	18,408
Other	17,670	16,454
Other liabilities	$ 95,541	$ 101,211