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BUSINESS SEGMENT AND OTHER OPERATIONS DATA - RECONCILIATION OF SEGMENT ASSETS TO CONSOLIDATED (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Sep. 30, 2013
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 3,196,818 $ 3,004,783
Natural Gas Distribution [Member]
    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 2,165,350 2,094,940
Energy Services [Member]
    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 591,430 468,096
Clean Energy Ventures [Member]
    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 301,645 253,663
Midstream [Member]
    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 152,271 153,536
Subtotal [Member]
    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 3,210,696 2,970,235
Retail and Other [Member]
    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 90,267 85,293
Intercompany Assets [Member]
    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ (104,145) [1] $ (50,745) [1]
[1] Consists of transactions between subsidiaries that are eliminated and reclassified in consolidation.