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Fuel Derivatives Outstanding (Detail)
Nov. 30, 2011
bbl
Fuel Derivatives 2012 Third Quarter Maturity
 
Derivative [Line Items]  
Barrels 522,000 [1]
Weighted-Average Floor Price 75 [1]
Weighted-Average Ceiling Price 135 [1]
Percent of Estimated Fuel Consumption 10.00% [1]
Fuel Derivatives 2012 Fourth Quarter Maturity
 
Derivative [Line Items]  
Barrels 522,000 [1]
Weighted-Average Floor Price 75 [1]
Weighted-Average Ceiling Price 135 [1]
Percent of Estimated Fuel Consumption 10.00% [1]
Fuel Derivatives Second Half 2012
 
Derivative [Line Items]  
Barrels 1,044,000 [1]
Weighted-Average Floor Price 75 [1]
Weighted-Average Ceiling Price 135 [1]
Fuel Derivatives 2013 Maturity
 
Derivative [Line Items]  
Barrels 2,112,000 [1]
Weighted-Average Floor Price 74 [1]
Weighted-Average Ceiling Price 132 [1]
Percent of Estimated Fuel Consumption 10.00% [1]
Fuel Derivatives 2014 Maturity
 
Derivative [Line Items]  
Barrels 2,112,000 [1]
Weighted-Average Floor Price 71 [1]
Weighted-Average Ceiling Price 128 [1]
Percent of Estimated Fuel Consumption 10.00% [1]
Fuel Derivatives 2015 Maturity
 
Derivative [Line Items]  
Barrels 2,160,000 [1]
Weighted-Average Floor Price 71 [1]
Weighted-Average Ceiling Price 125 [1]
Percent of Estimated Fuel Consumption 10.00% [1]
[1] Fuel derivatives mature evenly over each quarter within the above fiscal years.