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Provision (Benefit) For Income Taxes And Effective Tax Rates (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Taxes [Abstract]
Income before income taxes	$ 61,085	$ 55,967	$ 158,403	$ 165,558
Provision (benefit) for income tax	$ (14,571)	$ 3,885	$ 5,082	$ (15,864)
Effective tax rate	(23.90%)	6.90%	3.20%	(9.60%)

- 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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