Derivative Instruments and Hedging Activities - Cash Flow Hedges (Detail) (Cash Flow Hedging [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives, Net of Tax	$ (105)		$ 2,344	$ 867
Gain (Loss) Reclassified from Accumulated OCI into Income, Net of Tax	(1,552)	(1,304)	(2,891)	(2,251)
Interest expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated OCI into Income, Net of Tax	(1,341)	(1,304)	(2,680)	(2,251)
Cost of products sold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated OCI into Income, Net of Tax	(211)		(211)
Interest rate swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives, Net of Tax				867
Commodity forward contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives, Net of Tax	$ (105)		$ 2,344