Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2013	Oct. 31, 2012
Company's purchase commitments
Aggregate purchase commitments unrelated parties	$ 973,052	$ 742,918
Unconsolidated entities that the Company has investments in	65,805	4,067
Total	1,038,857	746,985
Deposits against aggregate purchase commitments	42,428	42,921
Additional cash required to acquire land	996,429	704,064
Total	1,038,857	746,985
Amount of Additional Cash Required to Acquire Land Included in Accrued Expenses	$ 574	$ 4,328