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Inventories - Summarization of Inventories (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
Schedule Of Inventory [Line Items]
Finished goods	$ 96.9				$ 105.4
Raw materials and work-in process	277.4				323.6
Inventories, net	$ 374.3	$ 393.1	$ 380.5	$ 389.9	$ 429.0	$ 482.7	$ 454.3	$ 413.1	$ 395.1

The aggregate carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of items which are partially completed at the time of measurement and unprocessed items that will go through the production process and become part of the final product. This element may be used when the reporting entity combines work in process and raw materials into an aggregate amount.

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