Comprehensive Income and Accumulated Other Comprehensive Loss (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Sep. 30, 2011
Components of accumulated other comprehensive loss
Foreign currency translation adjustment, net of tax	$ (5,936)	$ (5,770)
Net retirement plan liability adjustment, net of tax	(6,266)	(6,932)
Interest rate swap agreement adjustment, net of tax	(53)	0
Total accumulated other comprehensive loss	$ (12,255)	$ (12,702)