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Financial Instruments (Details) (USD $)
3 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Sep. 30, 2011
Effect of Fair Value Hedges on Results of Operations [Abstract]      
Commodity contracts $ (24,064,000) $ 1,723,000  
Fair value adjustment for natural gas inventory designated as the hedged item 15,249,000 (15,625,000)  
Total impact on revenue 8,815,000 13,902,000  
Basis ineffectiveness 841,000 921,000  
Timing ineffectiveness 7,974,000 12,981,000  
Other Comprehensive Income Abstract      
Treasury lock agreements fair value (1,403,000) 31,425,000  
Forward commodity contracts fair value (23,678,000) 1,657,000  
Treasury lock agreements 316,000 422,000  
Forward commodity contracts 7,103,000 8,693,000  
Total other comprehensive income (loss) from hedging, net of tax (17,662,000) 42,197,000  
Expected Earnings [Line Items]      
Treasury Lock Gain Loss Reclassified To Earnings 8,701,000    
Commodity Contract Gain Loss Reclassified To Earnings (33,436,000)    
Natural Gas Inventory Abstract      
Inventory write-down to lower of cost or market 1,700,000    
Summary Of Derivative Instruments Abstract      
Minimum Length Of Time Hedged In Cash Flow Hedge one    
Maximum Length Of Time Hedged In Cash Flow Hedge 59    
Gain Loss On Hedge Ineffectiveness 8,400,000 13,500,000  
Gain Loss On Derivative Instruments Not Designated Hedges Net Pretax (2,200,000) 4,200,000  
Disposal Group, Including Discontinued Operation, Derivative Liabilities, Current 1,700,000   1,300,000
Next Twelve Months [Member]
     
Expected Earnings [Line Items]      
Treasury Lock Gain Loss Reclassified To Earnings (1,266,000)    
Commodity Contract Gain Loss Reclassified To Earnings (25,900,000)    
Thereafter [Member]
     
Expected Earnings [Line Items]      
Treasury Lock Gain Loss Reclassified To Earnings 9,967,000    
Commodity Contract Gain Loss Reclassified To Earnings (7,536,000)    
Natural Gas Distribution Segment [Member]
     
Commodity Contract Outstanding Volumes [Line Items]      
Fair Value 0    
Cash Flow 0    
Not designated 13,964,000,000    
Total Commodity Contracts Outstanding 13,964,000,000    
Derivatives Fair Value [Line Items]      
Derivative Assets Current 292,000   843,000
Derivative Assets Noncurrent 180,000   998,000
Derivative Liabilities Current 14,521,000   11,916,000
Derivative Liabilities Noncurrent 70,105,000   67,862,000
Total Financial Instruments (85,829,000) (79,277,000)  
Cash Flow Hedge [Line Items]      
Loss reclassified from AOCI into revenue for effective portion of commodity contracts 0 0  
Loss arising from ineffective portion of commodity contracts 0 0  
Total impact on revenue 0 0  
Net loss on settled Treasury lock agreements reclassified from AOCI into interest expense 502,000 670,000  
Total Impact from Cash Flow Hedges (502,000) (670,000)  
Natural Gas Distribution Segment [Member] | Designated As Hedging Instrument [Member]
     
Derivatives Fair Value [Line Items]      
Derivative Assets Liabilities At Fair Value Net (69,755,000) (67,527,000)  
Natural Gas Distribution Segment [Member] | Designated As Hedging Instrument [Member] | Other Current Assets [Member]
     
Derivatives Fair Value [Line Items]      
Derivative Assets Current 0 0  
Natural Gas Distribution Segment [Member] | Designated As Hedging Instrument [Member] | Deferred Charges And Other Assets [Member]
     
Derivatives Fair Value [Line Items]      
Derivative Assets Noncurrent 0 0  
Natural Gas Distribution Segment [Member] | Designated As Hedging Instrument [Member] | Other Current Liabilities [Member]
     
Derivatives Fair Value [Line Items]      
Derivative Liabilities Current 0 0  
Natural Gas Distribution Segment [Member] | Designated As Hedging Instrument [Member] | Deferred Credits And Other Liabilities [Member]
     
Derivatives Fair Value [Line Items]      
Derivative Liabilities Noncurrent (69,755,000) (67,527,000)  
Natural Gas Distribution Segment [Member] | Nondesignated [Member]
     
Derivatives Fair Value [Line Items]      
Other Derivatives Not Designated As Hedging Instruments At Fair Value Net (16,074,000) (11,750,000)  
Natural Gas Distribution Segment [Member] | Nondesignated [Member] | Other Current Assets [Member]
     
Derivatives Fair Value [Line Items]      
Derivative Assets Current 292,000 843,000  
Natural Gas Distribution Segment [Member] | Nondesignated [Member] | Deferred Charges And Other Assets [Member]
     
Derivatives Fair Value [Line Items]      
Derivative Assets Noncurrent 180,000 998,000  
Natural Gas Distribution Segment [Member] | Nondesignated [Member] | Other Current Liabilities [Member]
     
Derivatives Fair Value [Line Items]      
Derivative Liabilities Current (16,196,000) (13,256,000)  
Natural Gas Distribution Segment [Member] | Nondesignated [Member] | Deferred Credits And Other Liabilities [Member]
     
Derivatives Fair Value [Line Items]      
Derivative Liabilities Noncurrent (350,000) (335,000)  
Nonregulated Segment [Member]
     
Commodity Contract Outstanding Volumes [Line Items]      
Fair Value (26,690,000,000)    
Cash Flow 44,428,000,000    
Not designated 46,944,000,000    
Total Commodity Contracts Outstanding 64,682,000,000    
Derivatives Fair Value [Line Items]      
Derivative Assets Current 10,732,000   17,501,000
Derivative Assets Noncurrent 6,196,000   0
Derivative Liabilities Current 4,623,000   3,537,000
Derivative Liabilities Noncurrent 5,484,000   10,227,000
Total Financial Instruments (15,263,000) (25,050,000)  
Cash Flow Hedge [Line Items]      
Loss reclassified from AOCI into revenue for effective portion of commodity contracts 11,642,000 14,253,000  
Loss arising from ineffective portion of commodity contracts 430,000 444,000  
Total impact on revenue (12,072,000) (14,697,000)  
Net loss on settled Treasury lock agreements reclassified from AOCI into interest expense 0 0  
Total Impact from Cash Flow Hedges (12,072,000) (14,697,000)  
Nonregulated Segment [Member] | Designated As Hedging Instrument [Member]
     
Derivatives Fair Value [Line Items]      
Derivative Assets Liabilities At Fair Value Net (9,720,000) (16,203,000)  
Nonregulated Segment [Member] | Designated As Hedging Instrument [Member] | Other Current Assets [Member]
     
Derivatives Fair Value [Line Items]      
Derivative Assets Current 60,222,000 22,396,000  
Nonregulated Segment [Member] | Designated As Hedging Instrument [Member] | Deferred Charges And Other Assets [Member]
     
Derivatives Fair Value [Line Items]      
Derivative Assets Noncurrent 58,000 174,000  
Nonregulated Segment [Member] | Designated As Hedging Instrument [Member] | Other Current Liabilities [Member]
     
Derivatives Fair Value [Line Items]      
Derivative Liabilities Current (57,988,000) (31,064,000)  
Nonregulated Segment [Member] | Designated As Hedging Instrument [Member] | Deferred Credits And Other Liabilities [Member]
     
Derivatives Fair Value [Line Items]      
Derivative Liabilities Noncurrent (12,012,000) (7,709,000)  
Nonregulated Segment [Member] | Nondesignated [Member]
     
Derivatives Fair Value [Line Items]      
Other Derivatives Not Designated As Hedging Instruments At Fair Value Net (5,543,000) (8,847,000)  
Nonregulated Segment [Member] | Nondesignated [Member] | Other Current Assets [Member]
     
Derivatives Fair Value [Line Items]      
Derivative Assets Current 148,669,000 67,710,000  
Nonregulated Segment [Member] | Nondesignated [Member] | Deferred Charges And Other Assets [Member]
     
Derivatives Fair Value [Line Items]      
Derivative Assets Noncurrent 80,916,000 22,379,000  
Nonregulated Segment [Member] | Nondesignated [Member] | Other Current Liabilities [Member]
     
Derivatives Fair Value [Line Items]      
Derivative Liabilities Current (166,878,000) (73,865,000)  
Nonregulated Segment [Member] | Nondesignated [Member] | Deferred Credits And Other Liabilities [Member]
     
Derivatives Fair Value [Line Items]      
Derivative Liabilities Noncurrent (68,250,000) (25,071,000)  
Regulated Transmission and Storage Segment [Member]
     
Derivatives Fair Value [Line Items]      
Derivative Assets Current 0   0
Derivative Assets Noncurrent 0   0
Derivative Liabilities Current 0   0
Derivative Liabilities Noncurrent $ 0   $ 0