Venezuela - Additional Information (Detail) In Millions, unless otherwise specified	9 Months Ended								9 Months Ended		3 Months Ended	9 Months Ended
	Jun. 30, 2014 USD ($)	Jun. 30, 2013 USD ($)	Jun. 30, 2014 VEF	Mar. 31, 2014 VEF	Jun. 30, 2014 Maximum [Member] USD ($)	Jun. 30, 2014 Operating Affiliate, Venezuela [Member]	Jun. 30, 2014 SICAD 2 Currency Exchange Mechanism [Member] VEF	Mar. 31, 2014 SICAD 2 Currency Exchange Mechanism [Member] VEF	Jun. 30, 2014 Subsidiaries [Member] USD ($)	Jun. 30, 2013 Subsidiaries [Member] USD ($)	Jun. 30, 2014 Operating Affiliate [Member] USD ($)	Jun. 30, 2014 Operating Affiliate [Member] USD ($)	Jun. 30, 2014 Operating Affiliate [Member] Operating Affiliate, Venezuela [Member] USD ($)
Nature Of Operations [Line Items]
Equity method investment, ownership percentage						49.00%
Operating affiliate investment	$ 17
Due from affiliates, dividends cash			20		1
Cash dividends received from subsidiary									4	2
Conversion of bolivars to per USD				6.3			50.0	50.8
Negative impact of exchange rate devaluation	4												8
Currency denomination, remeasurement loss											2
Tax benefit due to reduction of deferred tax liability	$ (16)	$ 7										$ 2