Supplemental Guarantor Information (Level 4 Senior Note table) (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2012	Oct. 31, 2011	Jul. 31, 2012 Senior Notes Due 2012 [Member]	Nov. 22, 2002 Senior Notes Due 2012 [Member]	Jul. 31, 2012 Senior Notes Due 2013 [Member]	Sep. 03, 2003 Senior Notes Due 2013 [Member]	Jul. 31, 2012 Senior Notes Due 2014 [Member]	Mar. 16, 2004 Senior Notes Due 2014 [Member]	Jul. 31, 2012 Senior Notes Due 2015 [Member]	Jun. 02, 2005 Senior Notes Due 2015 [Member]	Jul. 31, 2012 Senior Notes Due 2017 [Member]	Apr. 13, 2009 Senior Notes Due 2017 [Member]	Jul. 31, 2012 Senior Notes Due 2019 [Member]	Sep. 22, 2009 Senior Notes Due 2019 [Member]	Jul. 31, 2012 Senior Notes Due 2022 [Member]	Feb. 07, 2012 Senior Notes Due 2022 [Member]
Supplemental Guarantor Information (Textual) [Abstract]
Issued Senior Notes				$ 300,000		$ 250,000		$ 300,000		$ 300,000		$ 400,000		$ 250,000		$ 419,876
Senior notes	$ 1,792,453	$ 1,490,972	$ 59,067		$ 104,785		$ 267,960		$ 300,000		$ 400,000		$ 250,000		$ 419,876
Interest rate on notes			6.875%		5.95%		4.95%		5.15%		8.91%		6.75%		5.875%