Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Oct. 31, 2012
Company's purchase commitments
Aggregate purchase commitments unrelated parties	$ 1,173,974	$ 742,918
Unconsolidated entities that the Company has investments in	61,738	4,067
Total	1,235,712	746,985
Deposits against aggregate purchase commitments	44,051	42,921
Additional cash required to acquire land	1,191,661	704,064
Total	1,235,712	746,985
Amount of Additional Cash Required to Acquire Land Included in Accrued Expenses	$ 443	$ 4,328