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Provision (Benefit) For Income Taxes And Effective Tax Rates (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012
Taxes [Abstract]
Income before income taxes	$ 86,707	$ 23,489	$ 158,437	$ 97,318
Provision (benefit) for income tax	$ 18,016	$ 2,518	$ 19,824	$ 19,653
Effective tax rate	20.80%	10.70%	12.50%	20.20%

- 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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