Other Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013
Other Liabilities
Net accrued retirement benefits, less amounts recognized within accrued liabilities	$ 39,254	$ 39,956
Total unrecognized tax benefits, net of offsetting adjustments	20,729	20,343
Acquired performance obligations and unfavorable contracts	21,300	23,951
Other	27,112	21,260
Other liabilities	$ 108,395	$ 105,510