Components of Accumulated Other Comprehensive Loss (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Sep. 30, 2012
Schedule of Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign currency translation adjustment, net of tax	$ (5,850)	$ (5,566)
Net retirement plan liability adjustment, net of tax	(6,491)	(6,720)
Interest rate swap agreement adjustment, net of tax	(42)	(58)
Total accumulated other comprehensive loss	$ (12,383)	$ (12,344)