Derivative Instruments and Hedging Activities - Undesignated Hedges (Detail) (Not Designated as Hedging Instrument [Member], Foreign Exchange Contract [Member], Other Income Expense [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2010
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Income Expense [Member]
Derivatives And Hedging Activities [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	$ (6,801)	[1]	$ (1,443)	[1]	$ (6,606)	[1]

[1] The gains and losses on forward contracts and currency options utilized to hedge the intercompany transactional foreign exchange exposures are largely offset by gains and losses on the underlying hedged items in Other (expense) income.