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Restructuring Charges - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012	Oct. 31, 2012
Restructuring and Related Cost [Abstract]
Restructuring charges	$ 4.2	$ 3.9	$ 5.4	$ 22.9
Amounts expected to be incurred			6.5		12.3
Employee Separation Costs [Member]
Restructuring and Related Cost [Abstract]
Restructuring charges	1.3		0.9
Asset Impairments [Member]
Restructuring and Related Cost [Abstract]
Restructuring charges	2.3		2.8
Other Restructuring Costs [Member]
Restructuring and Related Cost [Abstract]
Restructuring charges	$ 0.6		$ 1.7

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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