Taxes (Tables)

6 Months Ended

Apr. 30, 2012

Taxes [Abstract]

Provision (Benefit) For Income Taxes And Effective Tax Rates

	Three Months Ended April 30,						Six Months Ended April 30,
	2012			2011			2012			2011
	(in thousands)						(in thousands)
Income before income taxes	$	23,489		$	57,259		$	97,318		$	109,591
Provision (benefit) for income tax	$	2,518		$	(23,855	)	$	19,653		$	(19,749	)
Effective tax rate		10.7	%		(41.7	)%		20.2	%		(18.0	)%