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Inventories (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
May 31, 2012
May 31, 2011
May 31, 2012
May 31, 2011
Interest costs        
Capitalized interest at beginning of period $ 234,917 $ 253,040 $ 233,461 $ 249,966
Interest incurred (a) 29,609 29,462 60,020 55,399
Interest expensed (a) (14,469) (13,121) (30,755) (24,560)
Interest amortized to construction and land costs (15,025) (19,589) (27,694) (31,013)
Capitalized interest at end of period (b) $ 235,032 $ 249,792 $ 235,032 $ 249,792