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Selected Quarterly Financial Data
12 Months Ended
Oct. 31, 2011
Quarterly Financial Data [Abstract]  
Quarterly Financial Information Text Block
16. Selected Quarterly Financial Data (In thousands except per share amounts) (Unaudited)
                   
              Earnings (Loss)
        Operating Net Per Share of
  Operating   Income  Income Common Stock
  Revenues Margin (Loss) (Loss) Basic Diluted
                   
Fiscal Year 2011                  
January 31 $ 652,056 $ 230,006 $ 90,869 $ 84,440 $ 1.17 $ 1.16
April 30   392,567   172,931   52,927   47,408   0.66   0.66
July 31   197,274   81,963   389   (8,703)   (0.12)   (0.12)
October 31   192,008   88,739   (1,174)   (9,577)   (0.13)   (0.13)
                   
Fiscal Year 2010                  
January 31 $ 673,736 $ 222,942 $ 87,801 $ 113,749 $ 1.55 $ 1.55
April 30   472,846   168,678   52,225   46,825   0.65   0.65
July 31   211,603   77,897   (3,471)   (9,518)   (0.13)   (0.13)
October 31   194,110   83,075   1,723   (9,102)   (0.13)   (0.13)

The pattern of quarterly earnings is the result of the highly seasonal nature of the business as variations in weather conditions and our regulated utility rate designs generally result in greater earnings during the winter months. Basic earnings per share are calculated using the weighted average number of shares outstanding during the quarter. The annual amount may differ from the total of the quarterly amounts due to changes in the number of shares outstanding during the year.