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Fair Value Measurements, Derivative Instruments and Hedging Activities - Fuel Derivatives Outstanding (Detail) | 6 Months Ended
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May 31, 2014 bbl
Fuel Derivatives 2014 Maturity November 2011 Transaction Date |  |
Derivative [Line Items] |  |
Barrels | 1,056,000 | [1]
Weighted-Average Floor Price | 85 | [1]
Weighted-Average Ceiling Price | 114 | [1]
Derivative Inception Month And Year | 2011-11 | [1]
Fuel Derivatives 2014 Maturity February 2012 Transaction Date |  |
Derivative [Line Items] |  |
Barrels | 1,056,000 | [1]
Weighted-Average Floor Price | 88 | [1]
Weighted-Average Ceiling Price | 125 | [1]
Derivative Inception Month And Year | 2012-02 | [1]
Fuel Derivatives 2014 Maturity June 2012 Transaction Date |  |
Derivative [Line Items] |  |
Barrels | 1,188,000 | [1]
Weighted-Average Floor Price | 71 | [1]
Weighted-Average Ceiling Price | 116 | [1]
Derivative Inception Month And Year | 2012-06 | [1]
Fuel Derivatives 2014 Maturity May 2013 Transaction |  |
Derivative [Line Items] |  |
Barrels | 864,000 | [1]
Weighted-Average Floor Price | 85 | [1]
Weighted-Average Ceiling Price | 108 | [1]
Derivative Inception Month And Year | 2013-05 | [1]
Fuel Derivatives 2014 Maturity |  |
Derivative [Line Items] |  |
Barrels | 4,164,000 | [1]
Percent of Estimated Fuel Consumption | 44.00% | [1]
Fuel Derivatives 2015 Maturity November 2011 Transaction Date |  |
Derivative [Line Items] |  |
Barrels | 2,160,000 | [1]
Weighted-Average Floor Price | 80 | [1]
Weighted-Average Ceiling Price | 114 | [1]
Derivative Inception Month And Year | 2011-11 | [1]
Fuel Derivatives 2015 Maturity February 2012 Transaction Date |  |
Derivative [Line Items] |  |
Barrels | 2,160,000 | [1]
Weighted-Average Floor Price | 80 | [1]
Weighted-Average Ceiling Price | 125 | [1]
Derivative Inception Month And Year | 2012-02 | [1]
Fuel Derivatives 2015 Maturity June 2012 Transaction Date |  |
Derivative [Line Items] |  |
Barrels | 1,236,000 | [1]
Weighted-Average Floor Price | 74 | [1]
Weighted-Average Ceiling Price | 110 | [1]
Derivative Inception Month And Year | 2012-06 | [1]
Fuel Derivatives 2015 Maturity April 2013 Transaction Date |  |
Derivative [Line Items] |  |
Barrels | 1,044,000 | [1]
Weighted-Average Floor Price | 80 | [1]
Weighted-Average Ceiling Price | 111 | [1]
Derivative Inception Month And Year | 2013-04 | [1]
Fuel Derivatives 2015 Maturity May 2013 Transaction Date |  |
Derivative [Line Items] |  |
Barrels | 1,884,000 | [1]
Weighted-Average Floor Price | 80 | [1]
Weighted-Average Ceiling Price | 110 | [1]
Derivative Inception Month And Year | 2013-05 | [1]
Fuel Derivatives 2015 Maturity |  |
Derivative [Line Items] |  |
Barrels | 8,484,000 | [1]
Percent of Estimated Fuel Consumption | 45.00% |
Fuel Derivatives 2016 Maturity June 2012 Transaction Date |  |
Derivative [Line Items] |  |
Barrels | 3,564,000 | [1]
Weighted-Average Floor Price | 75 | [1]
Weighted-Average Ceiling Price | 108 | [1]
Derivative Inception Month And Year | 2012-06 | [1]
Fuel Derivatives 2016 Maturity February 2013 Transaction Date |  |
Derivative [Line Items] |  |
Barrels | 2,160,000 | [1]
Weighted-Average Floor Price | 80 | [1]
Weighted-Average Ceiling Price | 120 | [1]
Derivative Inception Month And Year | 2013-02 | [1]
Fuel Derivatives 2016 Maturity April 2013 Transaction Date |  |
Derivative [Line Items] |  |
Barrels | 3,000,000 | [1]
Weighted-Average Floor Price | 75 | [1]
Weighted-Average Ceiling Price | 115 | [1]
Derivative Inception Month And Year | 2013-04 | [1]
Fuel Derivatives 2016 Maturity |  |
Derivative [Line Items] |  |
Barrels | 8,724,000 | [1]
Percent of Estimated Fuel Consumption | 45.00% | [1]
Fuel Derivatives 2017 Maturity February 2013 Transaction Date |  |
Derivative [Line Items] |  |
Barrels | 3,276,000 | [1]
Weighted-Average Floor Price | 80 | [1]
Weighted-Average Ceiling Price | 115 | [1]
Derivative Inception Month And Year | 2013-02 | [1]
Fuel Derivatives 2017 Maturity April 2013 Transaction Date |  |
Derivative [Line Items] |  |
Barrels | 2,028,000 | [1]
Weighted-Average Floor Price | 75 | [1]
Weighted-Average Ceiling Price | 110 | [1]
Derivative Inception Month And Year | 2013-04 | [1]
Fuel Derivatives 2017 Maturity Date January 2014 Transaction Date |  |
Derivative [Line Items] |  |
Barrels | 1,800,000 | [1]
Weighted-Average Floor Price | 75 |
Weighted-Average Ceiling Price | 114 |
Derivative Inception Month And Year | 2014-01 | [1]
Fuel Derivatives 2017 Maturity |  |
Derivative [Line Items] |  |
Barrels | 7,104,000 | [1]
Percent of Estimated Fuel Consumption | 37.00% | [1]
Fuel Derivatives 2018 Maturity January 2014 Transaction Date |  |
Derivative [Line Items] |  |
Weighted-Average Floor Price | 75 |
Weighted-Average Ceiling Price | 110 |
Fuel Derivatives 2018 Maturity |  |
Derivative [Line Items] |  |
Barrels | 2,700,000 | [1]
Percent of Estimated Fuel Consumption | 14.00% | [1]
[1] | Fuel derivatives mature evenly over each month within the above fiscal periods.

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract. + References No definition available. + Details
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- Definition Floor rate on a price risk derivative such as a floor or a collar. A payment or receipt is triggered if the market rate falls below the floor rate on the contract. + References No definition available. + Details
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- Details
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- Definition The percentage of expected requirements covered by the aggregate notional amount of derivative contracts expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract as a percentage of expected need. + References No definition available. + Details
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