Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2012	Oct. 31, 2011
Company's purchase commitments
Aggregate purchase commitments unrelated parties	$ 742,918	$ 551,905
Unconsolidated entities that the Company has investments in	4,067	12,471
Total	746,985	564,376
Deposits against aggregate purchase commitments	42,921	37,987
Additional cash required to acquire land	704,064	526,389
Amount of Additional Cash Required to Acquire Land Included in Accrued Expenses	$ 4,328	$ 44