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Restructuring Charges - Reconciliation of Beginning and Ending Restructuring Reserve Balances (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jan. 31, 2015	Jan. 31, 2014
Restructuring Cost and Reserve [Line Items]
Beginning balance	$ 4.1us-gaap_RestructuringReserve
Costs incurred and charged to expense	3.2us-gaap_RestructuringCharges	2.4us-gaap_RestructuringCharges
Costs paid or otherwise settled	(1.6)
Ending balance	5.7us-gaap_RestructuringReserve
Employee Separation Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance	2.9
Costs incurred and charged to expense	2.7
Costs paid or otherwise settled	(0.8)
Ending balance	4.8
Other Restructuring Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance	1.2
Costs incurred and charged to expense	0.5
Costs paid or otherwise settled	(0.8)
Ending balance	$ 0.9

- 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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