Senior Notes Payable (Details Textual) (USD $)	1 Months Ended	3 Months Ended	9 Months Ended
	Feb. 29, 2012	Jul. 31, 2012	Jul. 31, 2012	Jul. 31, 2011	Oct. 31, 2011	Feb. 07, 2012 5.875 % senior notes due 2022 [Member]	Feb. 07, 2012 Senior notes issued for cash [Member]	Mar. 05, 2012 Senior notes issued through an exchange [Member]	Mar. 05, 2012 6.875% Senior notes due 2012 [Member]	Mar. 05, 2012 5.95% Senior notes due 2013 [Member]
Senior Note Payable (Textual) [Abstract]
Issued Senior Notes		$ 1,792,453,000	$ 1,792,453,000		$ 1,490,972,000		$ 300,000,000	$ 119,900,000
Interest rate on notes						5.875%			6.875%	5.95%
Proceeds from issuance of the Senior Notes	296,200,000		296,227,000
Senior Notes Exchanged									80,700,000	36,900,000
Costs associated with the exchange of both series of notes		$ 1,200,000