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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jan. 31, 2013	Jan. 31, 2012
Operating Loss Carryforwards [Line Items]
Effective tax rate	32.30%	32.50%
Income tax expense	$ 12.5	$ 11.0
Net decrease in unrecognized tax benefits for the next 12 months, Minimum	0
Net decrease in unrecognized tax benefits for the next 12 months, Maximum	$ 48.5

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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