Income Taxes (Schedule of Income Before Income Tax, Domestic Foreign) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2011	Apr. 30, 2011	Jan. 31, 2011	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2010
Income (loss) before income taxes:
United States									$ 40,650	$ 5,449	$ (613)
Foreign									234,802	187,315	125,039
Income before income taxes	82,639	71,387	62,679	58,747	62,880	49,136	39,720	41,028	275,452	192,764	124,426
Income tax provision									$ 26,808	$ 17,334	$ 11,623