Other Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Sep. 30, 2013
Other Liabilities
Net accrued retirement benefits, less amounts recognized within accrued liabilities	$ 38,409	$ 39,956
Total unrecognized tax benefits, net of offsetting adjustments	15,916	20,343
Acquired performance obligations and unfavorable contracts	17,030	23,951
Other	29,949	21,260
Other liabilities	$ 101,304	$ 105,510