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Restructuring Charges - Reconciliation of Beginning and Ending Restructuring Reserve Balances (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
Restructuring Cost and Reserve [Line Items]
Beginning balance			$ 4.1us-gaap_RestructuringReserve
Costs incurred and charged to expense	7.3us-gaap_RestructuringCharges	3.9us-gaap_RestructuringCharges	10.5us-gaap_RestructuringCharges	6.3us-gaap_RestructuringCharges
Costs paid or otherwise settled			(4.8)
Ending balance	9.8us-gaap_RestructuringReserve		9.8us-gaap_RestructuringReserve
Employee Separation Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance			2.9
Costs incurred and charged to expense	5.0		7.7
Costs paid or otherwise settled			(3.2)
Ending balance	7.4		7.4
Other Restructuring Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance			1.2
Costs incurred and charged to expense	2.3		2.8
Costs paid or otherwise settled			(1.6)
Ending balance	$ 2.4		$ 2.4

- 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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