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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended		12 Months Ended
	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012	Oct. 31, 2012	Oct. 31, 2011
Income Tax Disclosure [Abstract]
Income tax expense	$ 25.9	$ 19.6	$ 13.2	$ 25.0	$ 58.7	$ 52.2	$ 58.8	$ 67.3
Effective tax rate	35.20%			38.60%	33.90%	34.80%
Net decrease in unrecognized tax benefits for the next 12 months, Minimum	17.8				17.8
Net decrease in unrecognized tax benefits for the next 12 months, Maximum	$ 28.0				$ 28.0

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Publisher FASB

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The estimated lower bound of the reasonably possible change in the total amount of the unrecognized tax benefit (that will significantly increase or decrease within twelve months of the balance sheet date) for a tax position taken.

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The estimated upper bound of the reasonably possible change in the total amount of the unrecognized tax benefit (that will significantly increase or decrease within twelve months of the balance sheet date) for a tax position taken.

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