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Restructuring Charges - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012	Oct. 31, 2012
Restructuring and Related Cost [Abstract]
Restructuring charges	$ (0.1)	$ 10.1	$ 1.2	$ 19.0
Amounts expected to be incurred			7.2		12.3
Employee Separation Costs [Member]
Restructuring and Related Cost [Abstract]
Restructuring charges	(1.0)		(0.4)
Asset Impairments [Member]
Restructuring and Related Cost [Abstract]
Restructuring charges	0.4		0.5
Other Restructuring Costs [Member]
Restructuring and Related Cost [Abstract]
Restructuring charges	$ 0.5		$ 1.1

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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