Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended	9 Months Ended				3 Months Ended
	Jul. 31, 2012	Oct. 31, 2011 Internal Revenue Service (IRS) Fiscal Years 2006 through 2009	Jul. 31, 2012 Internal Revenue Service (IRS) Fiscal Years 2010 and 2011	Jul. 31, 2012 Non-U.S. Examinations Fiscal Years 2007 And 2008	Jul. 31, 2012 Non-U.S. Examinations Fiscal Years 2009 And 2010 Cash Payment Obligations	Jul. 31, 2012 Non-U.S. Examinations Fiscal Years 2009 And 2010 Future cash payment	Apr. 30, 2012 Non-U.S. Examinations Fiscal Years 2007 through 2010	Jul. 31, 2012 Non-U.S. Examinations Fiscal Years 2009 and 2010	Jul. 31, 2012 Non-U.S. Examinations Fiscal Year 2008
Taxes [Line Items]
Statutory federal income tax rate	35.00%
Gross unrecognized tax benefits	$ 119
Unrecognized tax benefits that would affect effective tax rate	74
Estimated potential decrease in underlying unrecognized tax benefits, minimum	0
Estimated potential decrease in underlying unrecognized tax benefits, maximum	44
Decrease in unrecognized tax benefits resulting from settlement with taxing authorities		35.9	24.7				27.0	24.2	16.5
Tax impact from tax settlements		32.8	15.9						14.7
Cash payments as a result of settlement				$ 5.1	$ 3.2	$ 10.9