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Business Segment Information - Total Assets By Geographical Area (Detail) (USD $) In Millions, unless otherwise specified	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2011	Apr. 30, 2011	Jan. 31, 2011	Oct. 31, 2010
Total assets by geographical area:
Total assets	$ 3,856.9	$ 3,904.6	$ 4,011.3	$ 4,046.7	$ 4,188.8	$ 3,983.7	$ 3,694.8	$ 3,509.8	$ 3,481.5
North America [Member]
Total assets by geographical area:
Total assets	1,717.2				1,776.4
Europe, Middle East, and Africa [Member]
Total assets by geographical area:
Total assets	1,555.0				1,752.2
Asia Pacific And Latin America [Member]
Total assets by geographical area:
Total assets	$ 584.7				$ 660.2

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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