Schedule of Pension Plans and SERP Recognized in Consolidated Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Pension obligations and other long-term liabilities	$ (29,899)	$ (55,300)
Pension Plans
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Pension obligations and other long-term liabilities	(19,390)	(44,740)
Net amount recognized	(19,390)	(44,740)
SERP
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Employee related liabilities	(677)	(527)
Pension obligations and other long-term liabilities	(10,509)	(10,560)
Net amount recognized	$ (11,186)	$ (11,087)