Other Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Other Liabilities
Net accrued retirement benefits, less amounts recognized within accrued liabilities	$ 76,830	$ 80,341
Uncertain tax positions, net of offsetting benefits (Note 16)	17,374	15,061
Acquired performance obligations and unfavorable contracts	23,569	0
Other	14,068	14,041
Other liabilities, net	$ 131,841	$ 109,443