Income Tax Uncertainties - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2014 Internal Revenue Service (IRS) [Member]	Jun. 30, 2014 State Tax Authorities [Member]	Jun. 30, 2014 Non-U.S. Jurisdictions [Member]	Jun. 30, 2014 Minimum [Member] Internal Revenue Service (IRS) [Member]	Jun. 30, 2014 Minimum [Member] State Tax Authorities [Member]	Jun. 30, 2014 Minimum [Member] Non-U.S. Jurisdictions [Member]	Jun. 30, 2014 Maximum [Member] Internal Revenue Service (IRS) [Member]	Jun. 30, 2014 Maximum [Member] State Tax Authorities [Member]	Jun. 30, 2014 Maximum [Member] Non-U.S. Jurisdictions [Member]
Income Tax [Line Items]
Tax years remain subject to examination, description			2007 through 2013 tax years remain subject to examination by the IRS	2005 through 2013 remain subject to examination by the respective state tax authorities	2004 through 2013 remain subject to examination by their respective tax authorities
Tax years remain subject to examination						2007	2005	2004	2013	2013	2013
Unrecognized tax benefits		$ 6
Prepaid taxes recoverable from Canadian government		16
Amount received from Canadian government	$ 1